JP2009099492A - Road lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a road lighting device with a low power consumption and a good maintenance property. <P>SOLUTION: The road lighting device is provided with a light source unit 4 which has a plurality of LED elements provided in a row in longitudinal direction of a road and emits diffused flux of light from the LED elements toward the road through the lower opening, a sub-lens 5 which is installed at the lower part of the light source unit 4 and emits the condensed flux of light of fan shape expanding along the longitudinal direction of road by condensing the diffused flux of light from the LED elements to the direction for a width area of the road, and a main lens 6 which is installed at the lower part of the sub-lens 5 and emits the condensed flux of light condensed by the sub-lens 5 generally toward the illumination region and refracts a part of the condensed flux of light along the longitudinal direction of the road and emits to the far-end region direction in the illumination region. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lighting technique, and more particularly to a technique for lighting a road.

In general, in road illuminators that illuminate road surfaces such as roadways and sidewalks, lamps such as fluorescent lamps, high-pressure mercury lamps, metal halide lamps, and sodium lamps have been widely used as light sources (for example, Patent Document 1). reference). Since all of these types of lamps can obtain a high light amount, a wide illumination area such as a road can be illuminated with sufficient brightness simply by reflecting the light from the lamp with a dome-shaped reflecting mirror. .
When such a lamp is used as a light source of a road illuminating device, power consumption is large instead of obtaining a high amount of light, and the lifetime is relatively short due to a mechanical failure, resulting in poor maintainability.

On the other hand, in recent years, high-luminance and white LED elements are being provided at low cost, and lighting devices using such LED elements as illumination light sources have been proposed (see, for example, Patent Document 2). In this type of illumination device, a light distribution lens such as a Fresnel lens is disposed around an LED element to illuminate a circular or elliptical illumination area.
In addition to the lens formed on the mold resin of the LED element, a reflector or prism is provided around the LED element, and these LED elements are arranged in a matrix to illuminate the illumination area. (See, for example, Patent Document 3).

Japanese Patent Laid-Open No. 9-237511 JP 2005-196983 A JP 2004-253478 A

However, such a conventional technique is intended to illuminate a circular, elliptical, or rectangular illumination area, and therefore has a problem in that an illumination area extending at a predetermined width cannot be efficiently illuminated.
Although this type of white LED element has greatly improved brightness, it has a lower light intensity than conventional illumination light sources such as fluorescent lamps, high-pressure mercury lamps, metal halide lamps, sodium lamps, etc. It is difficult to illuminate with sufficient illuminance. Therefore, it is necessary to efficiently distribute the luminous flux from the LED element to a desired illumination area.

Since the conventional technology has a circular or elliptical illumination area having a two-dimensional expansion, when applied to an illumination area extending at a predetermined width, extra light is emitted in the width direction of the illumination area. Therefore, the illuminance of the desired illumination area is reduced. In the prior art, since light is uniformly emitted to a circular or elliptical illumination area, the illuminance at the peripheral edge of the illumination area decreases. Therefore, particularly in an illumination area extending at a predetermined width, the illuminance of the far end area is insufficient, so that it is not possible to obtain uniform brightness, that is, good brightness uniformity on the road surface in the illumination area.
The present invention is for solving such problems, and efficiently illuminates a road illumination area extending at a predetermined width with sufficient road surface brightness and good brightness uniformity using a light source composed of LED elements. It aims at providing the road lighting device which can be.

  In order to achieve such an object, a road illumination device according to the present invention is a road illumination device that illuminates a long illumination area having a width corresponding to the road width and having a predetermined length in the road longitudinal direction. A box-shaped device main body installed above the road and having a lower opening at the bottom, and a plurality of LED elements arranged in the device main body and arranged in the longitudinal direction of the road. A light source unit that emits a diffused light beam from the LED element toward the road, and a light source unit that is provided below the light source unit and condenses the diffused light beam from the LED element in the road width direction, thereby causing the road in the longitudinal direction. A sub-lens that emits a fan-shaped condensed light beam that spreads along the sub-lens, and a sub-lens that is provided below the sub-lens and emits the condensed light beam condensed by the sub-lens toward the illumination area as a whole, and light And a main lens for emitting a portion of the bundle in the direction of the distal end region of the illumination area by refracting along the road length.

At this time, as the main lens, it has a saddle shape that extends in the road width direction and curves downward along the road longitudinal direction, and is incident on the condensed light flux between the bottom and the end of the curved portion. You may use the lens in which the 1 or more partial lens which refracts | emits light and radiate | emits to an illumination area | region is formed.
At this time, a convex lens having an optical axis in the direction of the far end region of the illumination region may be used as the partial lens of the main lens.
Further, as a partial lens of the main lens, a concave lens having an optical axis in the direction of the central area of the illumination area may be used.

Further, as a partial lens of the main lens, a convex lens that emits a part of the light emitted toward the intermediate region between the central region of the illumination region and the far end region of the condensed light beam toward the far end region. It may be used.
Further, as the partial lens of the main lens, a convex lens that emits a part of the light emitted toward the far side from the illumination area in the condensed light beam may be used.
Further, as a partial lens of the main lens, a part of the light emitted toward the central region of the illumination region of the condensed light flux is directed toward an intermediate region between the central region and the far end region, or a far end region. A concave lens that emits light may be used.

Further, the main lens has a hook shape that extends in the road width direction and curves downward along the road longitudinal direction, and has a thickness from the bottom portion toward the middle portion between the bottom portion and the end portion in the curved portion. You may form so that may become thick gradually.
Further, the main lens has a hook shape that extends in the road width direction and curves downward along the road longitudinal direction, and is thicker from the end portion to the intermediate portion between the end portion and the bottom portion in the curved portion. You may form so that thickness may become thick gradually.

  In addition, a plurality of light source units arranged in parallel in the road width direction are provided, and each of the light source units is provided with a sub lens, and the main lens allows individual condensed light beams collected by these sub lenses to be along the road longitudinal direction. Alternatively, the light may be refracted and diffused at an arbitrary depression angle.

  Further, the apparatus main body has an upper opening at the top, and has a heat dissipation structure exposed to the outside of the apparatus main body through the upper opening, and dissipates heat generated by the LED element of the light source unit to the outside of the apparatus main body. A heat radiator may be provided.

According to the present invention, the diffused light beam emitted downward from the LED element of the light source unit is condensed by the sub lens into a fan-shaped condensed light beam that spreads in the longitudinal direction X, and then is illuminated by the main lens. In addition to being emitted toward the whole, a part of the condensed light beam is refracted along the longitudinal direction X and emitted toward the far end region in the illumination region.
Therefore, the diffused light flux from the LED element of the light source unit can be collected in a desired illumination area set along the road, and sufficient illuminance is obtained even in the far end area where the illuminance is insufficient compared to the central area. be able to. For this reason, even when an LED element is used as a light source, it is possible to efficiently illuminate with sufficient road surface luminance and good luminance uniformity over the entire illumination area, and as a result, road illumination device with low power consumption and good maintainability. Can be realized.

Next, embodiments of the present invention will be described with reference to the drawings.
[Road lighting equipment]
First, a road lighting device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an external view of a road lighting device according to an embodiment of the present invention as seen obliquely from above. FIG. 2 is an external view of the road illumination device according to the embodiment of the present invention as viewed obliquely from below. FIG. 3 is a plan view showing a road lighting apparatus according to an embodiment of the present invention. FIG. 4 is a front view showing the road lighting apparatus according to the embodiment of the present invention. FIG. 5 is a bottom view showing the road lighting apparatus according to the embodiment of the present invention. FIG. 6 is a rear view showing the road lighting apparatus according to the embodiment of the present invention. FIG. 7 is a left side view showing the road lighting apparatus according to the embodiment of the present invention.

  The road lighting device 100 is a device that is installed above a road and illuminates a long illumination area having a width corresponding to the road width and a predetermined length in the road longitudinal direction. For example, the road lighting device 100 is installed at a height of 8 to 12 m from the road, and is arranged at equal intervals along the road at intervals of 35 m.

  This embodiment is provided in a box-shaped device main body having a lower opening at the bottom, has a plurality of LED elements arranged in the longitudinal direction of the road, and from the LED elements toward the road via the lower opening. A light source unit that emits a diffused light beam, and a fan-shaped condensed light beam that is provided below the light source unit and condenses the diffused light beam from the LED element in the road width direction, and spreads along the road longitudinal direction. A sub-lens that exits, and a sub-lens that is provided below the sub-lens and that collects the condensed light beam collected by the sub-lens as a whole toward the illumination area, and a part of the condensed light beam in the longitudinal direction of the road A main lens that is refracted along and is emitted toward the far end region in the illumination region.

  Next, the configuration of the road lighting device 100 will be described in detail. In the following, in order to facilitate understanding, the longitudinal direction in which the road extends is defined as the longitudinal direction X, the road width direction orthogonal to the longitudinal direction X and crossing the road is defined as the width direction Y, and these longitudinal directions A direction from the road lighting device 100 toward the ground road orthogonal to X and the width direction Y is defined as a downward direction Z. Further, the surface of the road lighting device viewed from the opposite side of the road is the front of the road lighting device 100.

  The apparatus main body forming the road lighting device 100 has a dish-shaped lower lamp body 1 that is rectangular in plan view and opens upward, and a dish-shaped lower lamp body 1 that is rectangular in plan view and opens downward and mates with the lower lamp body 1. The upper lamp body 2 is constituted.

  The lower lamp body 1 has a long rectangular shape along the longitudinal direction X, and a part of the bottom plate 1A is unevenly distributed upward from the left end 1L to the right end 1R of the lower lamp body 1, thereby providing a lens support portion. 1B is formed. In addition, two lower openings 1C for irradiating the light flux from the light source unit 4 downward toward the road are formed in a part of the lens support 1B in parallel along the longitudinal direction X. .

  The upper plate 2A of the upper lamp body 2 is formed so as to be gradually inclined downward toward the distal end portion 2B, and a part of the upper plate 2A is opposed to the lens support portion 1B of the lower lamp body 1 at a position thereof. An upper opening 2C is formed. In addition, the heat radiator 3 is attached to the upper lamp body 2 so that the heat radiation structure 3A such as a heat radiation fin is exposed to the outside of the apparatus main body through the upper opening 2C.

  On the bottom surface 3B of the heat dissipating body 3, a long rectangular support substrate 4A in a plan view is attached along the width direction Y at positions facing the two lower openings 1C, respectively. A plurality of light source units 4 are attached in parallel along the width direction Y to the bottom surface 4B.

  Further, sub-lenses 5 are respectively attached to the bottom surface 4B of the support substrate 4A at the lower positions facing the respective light source units 4. These sub-lenses 5 collect a diffused light beam emitted downward from the light source unit 4 in the width direction Y, thereby expanding the fan-shaped collection extending in the longitudinal direction X around the direction of the central area of the illumination area on the road. It has a function of emitting a light beam downward.

  A main lens 6 is attached to the lens support portion 1B of the lower lamp body 1 at a lower position facing each sub lens 5 so that a part thereof is exposed from the lower opening 1C of the lower lamp body 1 to the outside of the apparatus main body. It has been. The main lens 6 emits the condensed light beam collected by the sub-lens 5 as a whole toward the illumination area, and a part of the condensed light beam along the longitudinal direction X in the far end area in the illumination area. It has the function of refracting in the direction and emitting.

  As a result, the diffused light beam emitted downward from the LED element of the light source unit 4 is condensed by the sub lens 5 into a fan-shaped condensed light beam that spreads in the longitudinal direction X, and then is illuminated by the main lens 6. In addition to being emitted toward the whole, a part of the condensed light beam is refracted along the longitudinal direction X and emitted toward the far end region in the illumination region.

In addition, a cylindrical mounting portion 2E for inserting the end of the pole 9 in the horizontal direction from the outside of the apparatus is fixed to the back side surface 2D of the upper lamp body 2.
The bottom lamp 1A of the lower lamp body 1 is electrically connected to a power supply circuit and a control circuit for driving each light source unit 4 and further to a power supply wiring introduced into the apparatus main body through the tube of the pole 9. A circuit unit 1D including a terminal block for mounting is attached.

[Configuration of optical system]
Next, with reference to FIGS. 8-12, the structure of the optical system of the road illuminating device concerning one embodiment of this invention is demonstrated.
FIG. 8 is a perspective view of the light source unit as viewed obliquely from below. FIG. 9 is a perspective view of the sub lens as viewed obliquely from below. FIG. 10 is a perspective view of the main lens as viewed obliquely from below. FIG. 11: is AA sectional drawing which shows the principal part of the road illuminating device concerning one embodiment of this invention. FIG. 12 is a BB cross-sectional view showing the main part of the road lighting device according to the embodiment of the present invention.

The optical system of the road lighting device according to the present embodiment includes a sub lens 5 and a main lens 6.
As shown in FIG. 8, the light source unit 4 includes a substrate 41 having a rectangular shape in plan view and a light emitting unit 43 in which a plurality of LED elements 44 are mounted in a row on the bottom surface 42 of the substrate 41. Each LED element is composed of a surface-mounted LED chip, and a diffused light beam diffusing in all directions is emitted from the LED element. The center position of the light emitting portion 43 in the longitudinal direction X and the width direction Y is referred to as a light emission center point 45.

  The sub-lens 5 is made of glass or transparent resin as a whole, and as shown in FIG. 9, a lens unit 51 such as a cylindrical lens that is long and has a downward convex shape along the light-emitting unit 43 of the light source unit 4. And a connecting portion 52 that connects the upper end portions of the adjacent lens portions 51. By the connecting portion 52, the lens portions 51 are arranged in parallel and integrated according to the arrangement pitch of the light emitting portions 43 of the light source unit 4. The center position in the longitudinal direction X and the width direction Y of each lens unit 51 is referred to as an optical center position 53.

  The main lens 6 is made of glass or transparent resin as a whole, and as shown in FIGS. 10 and 11, the lens portion 6 </ b> A that extends along the width direction Y and curves downward, and this lens portion. It is comprised from the attaching part 6B formed so that it might protrude in the outer horizontal direction of a curved part from a left-right upper edge part among the curved parts of 6A.

  In addition, the lens portion 6A has partial lenses 61R, 62R, having different functions in the depression direction along the longitudinal direction X with the optical center position P as the center between the left and right end portions 6D to the bottom portion 6E. 63R and partial lenses 61L, 62L, and 63L are connected to each other. Among these, the partial lenses 61R and 62R can be regarded as one partial lens (convex lens) 64R, the partial lenses 61L and 62L can be regarded as one partial lens (convex lens) 64L, and the partial lenses 63R and 63L are defined as one. One partial lens (concave lens) 63 can be considered.

As shown in FIGS. 11 and 12, the bottom surface 3 </ b> B of the heat radiating body 3 is disposed at positions facing the two lower openings 1 </ b> C of the lower lamp body 1 via insulating sheets 4 </ b> C having excellent thermal conductivity. Support substrates 4A are respectively attached by screws 4D.
Each light source unit 4 is attached to the bottom surface 4B of the support substrate 4A with a screw through an insulating sheet 4E having excellent heat conductivity with the light emitting portion 43 facing downward. These light source units 4 are attached in parallel along the longitudinal direction X and in parallel with each other along the width direction Y.

On the bottom surface 4B of the support substrate 4A, a light shielding plate 4F whose side surface is painted black is provided between adjacent light source units 4 in a direction parallel to the light source unit 4. The light shielding plate 4F can prevent light from the light emitting unit 43 of the light source unit 4 from being emitted in directions other than the sub lens 5 facing the light source unit 4.
At this time, by forming a reflection surface on the front side surface 4G facing the illumination area in the light shielding plate 4F, the light from the light emitting unit 43 can be reflected toward the illumination area, and the illuminance in the entire illumination area is improved. be able to.

  Further, sub-lenses 5 are respectively attached to the bottom surface 4B of the support substrate 4A at the lower positions facing the respective light source units 4 with screws 5A via spacers 5B. Accordingly, the light emitting unit 43 of the light source unit 4 is disposed in the light emitting unit 43 at the conjugate point of the lens unit 51 of the sub lens 5, and the diffused light beam from the light emitting unit 43 is illuminated in the width direction Y by the lens unit 51. Focused on the width of the region.

On the other hand, in the main lens 6, the mounting portion 6B is screwed to the lens support portion 1B of the lower lamp body 1 so that the lens portion 6A having a bowl shape is exposed from the lower opening 1C of the lower lamp body 1 to the outside of the apparatus main body. It is attached by. Thereby, the light emission part 43 of the light source unit 4 is arrange | positioned in the curved inner upper position of 6 A of lens parts.
At this time, the lens unit 6A is a left and right center position in the longitudinal direction X of the lens unit 6A as a conjugate point at which a desired illumination area is obtained at the curved inner upper position, and the left and right ends of the curved part of the lens unit 6A. An optical center position P is designed at a position slightly above 6D, and the positional relationship between the lens support 1B and the radiator 3 is such that the center of the light emitting unit 43 is disposed at the optical center position P. It is determined by the bottom surface 3B.

  In this way, a plurality of light emitting units 43 of the light source unit 4 are arranged in parallel in the longitudinal direction parallel to the longitudinal direction X, and the sub lens 5 has a longitudinal direction at a position below the light emitting units 43. The light emitting units 43 are arranged in parallel. Further, the main lens 6 is disposed at a position below the sub lenses 5 in parallel with the width direction Y in which the longitudinal direction is orthogonal to the light emitting portions 43 and the sub lenses 5.

  At this time, the light source unit 4 is arranged so that the light emission center point 45 of the light emitting unit 43 coincides with the light center position P of the main lens 6. Further, the sub lens 5 has the light source unit 4 and the main lens so that the light center position 53 of the lens portion 51 is positioned on the optical axis Q parallel to the downward direction Z passing through the light emission center point 45 and the light center position P. 6 is arranged.

  Thereby, the diffused light beam emitted downward from the LED element 44 of the light source unit 4 is condensed by the sub lens 5 into a fan-shaped condensed light beam that spreads in the longitudinal direction X, and then illuminated by the main lens 6. In addition to being emitted toward the entire region, a part of the condensed light beam is refracted along the longitudinal direction X and emitted toward the far end region in the illumination region.

[Operation of optical system]
Next, the operation of the optical system of the road illumination device according to the embodiment of the present invention will be described with reference to FIGS.
FIG. 13 is an explanatory diagram showing the light diffusion characteristics of the main lens. FIG. 14 is an explanatory diagram showing an illumination area (side view). FIG. 15 is an explanatory diagram showing an illumination area (plan view). FIG. 16 is an explanatory diagram showing light distribution characteristics of a single light source unit. FIG. 17 is an explanatory diagram showing the light distribution characteristics of the light source unit when the main lens of the road lighting device according to the embodiment of the present invention is used.

The illumination area 8 is an area for obtaining a predetermined road surface brightness by illumination of the road illumination device 100 according to the present embodiment. In this example, the illumination area 8 has a substantially rectangular shape having a width of the road 80 including the roadway 81 and the road shoulder 82. Yes. The diffused light beam from the light emitting unit 43 disposed at the optical center position P of the lens unit 6A is condensed by the sub lens 5 into a fan-shaped condensed light beam 70 that spreads in the longitudinal direction X, and then to the lens unit 6A. Led.
The condensed light beam 70 has an angle spread corresponding to at least the width of the illumination area 8 in the width direction Y. For this reason, in the case of the road lighting device 100 arranged at a high place, since the distance from the road lighting device 100 to the illumination area 8 is long, as shown in FIG. The lens portion 6A hardly acts on the condensed light beam 70 in the width direction Y. Therefore, the description of the light distribution function in the width direction Y is omitted here, and the light distribution function of the main lens 6 in the depression direction along the longitudinal direction X will be described.

  In the following, the light distribution characteristics of the main lens 6 with respect to the light center position P, that is, the collected light beam 70 emitted from the left and right centers of the light emitting unit 43 of the light source unit 4 will be described. As shown in FIG. The four light emitting portions 43 have a certain length along the longitudinal direction X. Therefore, actually, the illumination is slightly shifted along the longitudinal direction X with respect to the illumination region 8 so as to overlap the illumination region 8 formed by the condensed light flux 70 emitted from the left and right center of the light emitting unit 43. A region is formed by the main lens 6 based on the condensed light flux emitted from the left and right ends of the light emitting unit 43.

  As shown in FIG. 13, the lens portion 6A has three angles provided in the angular direction from the left and right end portions 6D to the bottom portion 6E of the curved portion in the depression direction along the longitudinal direction X with the optical center position P as the center. Corresponding to each of the regions θ1, θ2, and θ3, it is composed of a compound lens in which partial lenses having different functions are connected and formed.

  Hereinafter, the boundary direction between the angle region θ1 and the angle region θ2 is defined as the angle direction θA when viewed from the optical center position P, and the boundary direction between the angle region θ2 and the angle region θ3 is viewed from the optical center position P as the angular direction. θB is defined, and the direction directly below the optical center position P is defined as a direct downward direction θC. These angular regions θ1, θ2, θ3 and angular directions θA, θB are bilaterally symmetric about a line connecting the optical center position P and the direct downward direction θC, that is, the optical axis Q.

The partial lenses 61R and 61L provided in the angle region θ1 starting from the end portion 6D are configured by convex lenses in which the thickness of the curved portion gradually increases from the end portion 6D toward the angular direction θA.
That is, the partial lenses 61R and 61L refract a part of the light emitted toward the far end region 8A of the illumination region 8 in the condensed light beam 70 along the longitudinal direction X, thereby It is a convex lens that emits toward the end region 8A.

As a result, light 71R and 71L emitted from the sub-lens 5 in the longitudinal direction X in the direction far from the illumination region 8 in the longitudinal direction X, that is, the angle region θ1 in this case, from the initial traveling direction by the partial lenses 61R and 61L. The light is refracted obliquely downward and emitted as light 75R, 75L to the far end region 8A of the illumination region 8.
Therefore, useless light that is emitted from the illumination region 8 in the far direction by the illuminance of the far end region 8A, which is relatively insufficient in the illumination region 8, by the partial lenses 61R and 61L having a relatively simple configuration such as convex lenses. Can be supplemented with a part of. For this reason, even if it is an LED element with little light quantity compared with a lamp | ramp, the illumination area | region 8 can be illuminated efficiently and equally.

The partial lenses 62R and 62L provided in the angle region θ2 that starts after the angle region θ1 are configured by convex lenses in which the thickness of the curved portion gradually increases from the angle direction θB toward the angle direction θA.
That is, the partial lenses 62R and 62L are configured to transmit a part of the light emitted toward the intermediate region 8B between the central region 8C of the illumination region 8 and the far end region 8A in the condensed light beam 70 in the longitudinal direction X. Is a convex lens that emits toward the far-end region 8A by being refracted along.

As a result, the light 72R and 72L emitted from the sub-lens 5 in the longitudinal direction X obliquely downward of the apparatus main body, in this case, the angle region θ2, in the longitudinal direction X, are moved from the initial traveling direction by the partial lenses 62R and 62L. The light is refracted upward and is emitted to the far end region 8A of the illumination region 8 as light 76R and 76L.
Therefore, the illuminance of the far end region 8A, which is relatively insufficient in the illumination region 8, is emitted to the intermediate region 8B having sufficient illuminance by the partial lenses 62R and 62L having a relatively simple configuration such as convex lenses. Can be supplemented with part of the light. For this reason, even if it is an LED element with little light quantity compared with a lamp | ramp, the illumination area | region 8 can be illuminated efficiently and equally.

On the other hand, the partial lenses 63R and 63L provided in the angle region θ3 starting from the angle region θ2 are configured by concave lenses in which the thickness of the curved portion gradually decreases from the angle direction θB toward the bottom 6E. Yes.
That is, the partial lenses 63R and 63L refract a part of the light emitted toward the central region of the illumination region in the condensed light beam 70 along the longitudinal direction X, thereby allowing the intermediate region 8B or the far end to refract. It is a concave lens that emits toward the region 8A.

As a result, the light 73R and 73L emitted from the sub-lens 5 to the central region 8C of the apparatus main body in the longitudinal direction X in the longitudinal direction X, that is, the angle region θ3 in this case, is transmitted to the original traveling direction by the partial lenses 63R and 63L. The light is further refracted upward and emitted as light 77R and 77L to the intermediate region 8B of the illumination region 8 and further to the far end region 8A.
Therefore, the partial lenses 63R and 63L having a relatively simple configuration such as concave lenses emit the illuminance of the intermediate region 8B and the far end region 8A, which are relatively insufficient in the illumination region 8, to the central region 8C where the illuminance is excessive. It can be compensated with a part of the light. For this reason, even if it is an LED element with little light quantity compared with a lamp | ramp, the illumination area | region 8 can be illuminated efficiently and equally.

Among the partial lenses, the adjacent partial lenses 61R and 62R and the partial lenses 61L and 62L are both convex lenses, and therefore can be regarded as an integral partial lens. That is, the partial lenses 61R and 62R may be formed from a convex lens 64R having an optical axis in the direction of the far end region 8A, that is, the angular direction θA.
Thereby, in the longitudinal direction X, in the longitudinal direction X, the light 71R emitted to the angle region θ1 here, and the light 72R emitted to the angle region θ2 obliquely below the apparatus body, here the angle region θ2, in the longitudinal direction X. Is refracted by the convex lens 64R and emitted as light 75R, 76R to the far end region 8A of the illumination region 8.

Similarly, the partial lenses 61L and 62L may be formed of a convex lens 64L having an optical axis in the direction of the far end region 8A, that is, the angular direction θA.
As a result, 71 L of the condensed light beam 70 emitted in the longitudinal direction X farther from the illumination area 8, here in the angle area θ <b> 1, and light 72 </ b> L emitted in the obliquely lower direction here, here in the angle area θ <b> 2. The light is refracted by the convex lens 64L and emitted as light 75L and 76L to the far end region 8A of the illumination region 8.

Further, among the partial lenses, the adjacent partial lenses 63R and 63L are both concave lenses, so that they can be regarded as an integral partial lens. That is, the partial lenses 63R and 63L may be formed from the concave lens 63 having an optical axis in the direction of the central region 8C, that is, the direct downward direction θC.
As a result, the light 73R and 73L emitted in the central region 8C direction, here the angle region θ3, of the condensed light beam 70 is refracted by the concave lens 63 to be converted into the light 77R and 77L and the intermediate region 8B and the far end of the illumination region 8. The light is emitted to the region 8A.

According to the light distribution characteristic of the main lens 6 shown in FIG. 17, compared with the light distribution characteristic of the single light source unit in FIG. It can be seen that a high luminous intensity is obtained in the angle direction of about 60 ° in the longitudinal direction X from the optical axis Q).
The angle direction θA and the angle region θ1 may be determined based on the angular position relationship between the installation height of the road illumination device 100 and the far end region 8A of the illumination region 8. Further, regarding the angle direction θB and the angle regions θ2 and θ3, an angle at which the illuminance distribution falls within a desired range over the entire illumination region 8, for example, an angle of about 40 ° in the longitudinal direction X from the direct downward direction θC of the apparatus main body. The direction can be selected.

[Effects of the present embodiment]
As described above, the present embodiment has a plurality of LED elements arranged in the longitudinal direction of the road, provided in the box-shaped device main body having the lower opening at the bottom, and is directed toward the road via the lower opening. A light source unit that emits a diffused light beam from the element, and a fan-shaped collection provided below the light source unit and condensing the diffused light beam from the LED element in the road width direction to expand along the road longitudinal direction A sub-lens that emits a light beam and a sub-lens that is provided below the sub-lens and collects the condensed beam collected by the sub-lens as a whole toward the illumination area, and a part of the collected beam is road A main lens that refracts along the longitudinal direction and emits light toward the far end region in the illumination region.

As a result, the diffused light beam emitted downward from the LED element of the light source unit is condensed by the sub lens into a fan-shaped condensed light beam that spreads in the longitudinal direction X, and then directed to the entire illumination area by the main lens. And a part of the condensed light beam is refracted along the longitudinal direction X and is emitted toward the far end region in the illumination region.
Therefore, the diffused light flux from the LED element of the light source unit can be collected in a desired illumination area set along the road, and sufficient illuminance is obtained even in the far end area where the illuminance is insufficient compared to the central area. be able to. For this reason, even when an LED element is used as a light source, it is possible to efficiently illuminate with sufficient road surface luminance and good luminance uniformity over the entire illumination area, and as a result, road illumination device with low power consumption and good maintainability. Can be realized.

  Further, in the present embodiment, the main lens has a saddle shape that extends in the road width direction and curves downward along the road longitudinal direction, and the condensed light flux is between the bottom and the end of the curved portion. Since the lens in which one or more partial lenses that refract the incident light and emit to the illumination area is used is used, the fan-shaped condensed light flux that extends along the longitudinal direction X is used in the longitudinal direction X. The desired light distribution characteristic can be easily obtained in the depression direction along the line.

  Further, in the present embodiment, a convex lens that refracts light emitted obliquely downward of the apparatus main body out of the condensed light beam and emits it to the far end region of the illumination region is used as the partial lens of the main lens. Therefore, the lens having a relatively simple configuration called a convex lens can compensate for the insufficient illuminance in the far-end region with a part of the light emitted to the intermediate region with sufficient illuminance. For this reason, even if it is an LED element with little light quantity compared with a lamp | ramp, an illumination area | region can be illuminated efficiently and equally.

  In the present embodiment, as a partial lens of the main lens, a convex lens that refracts light emitted farther from the illumination area of the condensed light flux and emits it to the far end area of the illumination area is used. The lens having a relatively simple configuration called a convex lens can compensate for insufficient illuminance in the far end region with a part of wasted light emitted in the far direction from the illumination region. For this reason, even if it is an LED element with little light quantity compared with a lamp | ramp, an illumination area | region can be illuminated efficiently and equally. Moreover, since the light emitted in the far direction is reduced, it is possible to suppress the glare felt by the driver of the vehicle traveling on the road.

  In the present embodiment, a convex lens having an optical axis in the direction of the far end region of the illumination region is used as a partial lens of the main lens. The shortage of illuminance can be compensated by a part of the light emitted to the intermediate region with sufficient illuminance and a part of the wasted light emitted farther from the illumination region. For this reason, even if it is an LED element with little light quantity compared with a lamp | ramp, an illumination area | region can be illuminated efficiently and equally. Moreover, since the light emitted in the far direction is reduced, it is possible to suppress the glare felt by the driver of the vehicle traveling on the road.

  In the present embodiment, as the partial lens of the main lens, a concave lens that diffuses the light irradiated to the central region of the apparatus main body out of the condensed light flux and emits the light to the central region of the illumination region is used. Therefore, it is possible to compensate for the lack of illuminance in the far-end region with a part of the light emitted to the central region where the illuminance is excessive, by using a relatively simple lens such as a concave lens. For this reason, even if it is an LED element with little light quantity compared with a lamp | ramp, an illumination area | region can be illuminated efficiently and equally.

  Further, in the present embodiment, as the partial lens of the main lens, a convex lens that emits part of the light emitted toward the far end from the illumination area of the condensed light flux is used toward the far end area. The lens having a relatively simple configuration called a concave lens can compensate for the lack of illuminance in the far end region with a part of the light emitted to the central region where the illuminance is excessive. For this reason, even if it is an LED element with little light quantity compared with a lamp | ramp, an illumination area | region can be illuminated efficiently and equally.

  Further, in the present embodiment, the main lens has a bowl shape that extends in the road width direction and curves downward, and the thickness gradually increases from the bottom portion toward the middle portion between the bottom portion and the end portion in the curved portion. Since it is formed so as to be thick, the shortage of illuminance in the far end region can be compensated by a part of the light emitted to the intermediate region with sufficient illuminance. For this reason, even if it is an LED element with little light quantity compared with a lamp | ramp, an illumination area | region can be illuminated efficiently and equally.

  Further, in the present embodiment, the main lens has a hook shape that extends in the road width direction and curves downward, and the thickness gradually increases from the end portion to the intermediate portion between the end portion and the bottom portion in the curved portion. Therefore, the shortage of illuminance in the far end region can be compensated with a part of useless light emitted in the far direction from the illumination region. For this reason, even if it is an LED element with little light quantity compared with a lamp | ramp, an illumination area | region can be illuminated efficiently and equally.

  Further, in the present embodiment, the main lens has a bowl shape that extends in the road width direction and curves downward, and the thickness gradually increases from the middle part between the end part and the bottom part toward the bottom part in the curved part. Since it is formed so as to be thin, it is possible to compensate for the shortage of illuminance in the far end region and the shortage of illuminance in the far end region with a part of the light emitted to the central region where the illuminance is excessive. For this reason, even if it is an LED element with little light quantity compared with a lamp | ramp, an illumination area | region can be illuminated efficiently and equally.

  In the present embodiment, a plurality of light source units arranged in parallel in the road width direction are provided, and a sub lens is provided for each of the light source units, and individual condensed light beams collected by these sub lenses by the main lens. Is refracted and diffused at any depression angle along the longitudinal direction of the road, so the main lens can be shared by multiple light source units, reducing product / manufacturing costs, and providing a uniform light distribution for each light source unit The characteristics can be easily realized. When a sufficient amount of light is obtained with one light source unit, the same effect as described above can be obtained even with a configuration in which only one set of the light source unit and the sub lens is provided for the main lens.

  Further, in the present embodiment, an upper opening is provided in the upper part of the apparatus main body, and has a heat dissipation structure that is exposed to the outside of the apparatus main body through the upper opening, and heat generated by the LED element of the light source unit is generated. Since the heat radiator that dissipates heat to the outside is provided, it is possible to efficiently dissipate the heat generated in the light source unit to the outside of the apparatus main body.

[Extended embodiment]
In the above, the case where the main lens 6 is composed of a plurality of partial lenses 61R, 62R, 63R, 63L, 62L, 61L, or partial lenses 64R, 63, 64L has been described as an example. However, the present invention is not limited to this. For example, a partial lens may be formed only in a specific angle region of the main lens 6.

For example, the partial lenses 61R and 61L may be formed only in the angle region θ1 in FIG. 13, and the curved portions may be formed with the thickness in the left and right angular directions θA for the angle regions θ2 and θ3. As a result, the illuminance of the far end region 8A can be supplemented by using only the action of the partial lenses 61R and 61L.
Further, in FIG. 13, the partial lenses 63R and 63L, that is, the partial lens 63 may be formed only in the angle region θ3, and the curved portions may be formed in the left and right angular directions θB for the angle regions θ1 and θ2. . Thereby, only the action of the partial lens 63 can be used to supplement the illuminance of the intermediate region 8B and further the far end region 8A.

  Further, in FIG. 13, the partial lenses 62R and 62L are formed only in the angle region θ2, the curved portion is formed with the thickness in the left and right angle direction θA for the angle region θ1, and the left and right angles are formed for the angle region θ3. The curved portion may be formed with a thickness in the direction θB. Thereby, it is possible to supplement the illuminance of the far end region 8A by using only the action of the partial lenses 62R and 62L.

  Further, any of these partial lenses 61R, 62R, 63R, 63L, 62L, 61L may be formed in any combination. For example, for the angle regions θ1 and θ2, the partial lenses 61R, 62R, 62L, and 61L, that is, the partial lenses 64R and 64L are formed. For the angle region θ3, a curved portion is formed with a thickness in the left and right angular directions θB. May be. Thereby, it is possible to supplement the illuminance of the far-end region 8A using only the action of the partial lenses 64R and 64L.

  In addition, although the case where these partial lenses are formed symmetrically about the direct downward direction θC has been described, the present invention is not limited to this, and the partial lenses may be formed asymmetrically. In addition, the partial lenses 61R, 62R, and 63R and the partial lenses 61L, 62L, and 63L have been described on the assumption that they have light distribution characteristics that are symmetrical with respect to the direct downward direction θC, but the present invention is not limited thereto. Partial lenses having asymmetric light distribution characteristics may be formed.

It is the external view which looked at the road illuminating device concerning one embodiment of this invention from diagonally upward. It is the external view which looked at the road illuminating device concerning one embodiment of this invention from diagonally downward. It is a top view which shows the road illuminating device concerning one embodiment of this invention. It is a front view which shows the road illuminating device concerning one embodiment of this invention. It is a bottom view which shows the road illuminating device concerning one embodiment of this invention. It is a rear view which shows the road illuminating device concerning one embodiment of this invention. It is a left view which shows the road illuminating device concerning one embodiment of this invention. It is the perspective view which looked at the light source unit from diagonally downward. It is the perspective view which looked at the sub lens from diagonally downward. It is the perspective view which looked at the main lens from diagonally downward. It is AA sectional drawing which shows the principal part of the road illuminating device concerning one embodiment of this invention. It is BB sectional drawing which shows the principal part of the road illuminating device concerning one embodiment of this invention. It is explanatory drawing which shows the light-diffusion characteristic of a main lens. It is explanatory drawing which shows an illumination area | region (side view). It is explanatory drawing which shows an illumination area | region (plan view). It is explanatory drawing which shows the light distribution characteristic of a light source unit single-piece | unit. It is explanatory drawing which shows the light distribution characteristic of the light source unit at the time of using the main lens of the road illuminating device concerning one embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Lower lamp body, 1A ... Bottom plate, 1B ... Lens support part, 1C ... Lower opening part, 1D ... Circuit part, 1R ... Right end, 1L ... Left end, 2 ... Upper lamp body, 2A ... Upper plate, 2B ... Tip part 2C: Upper opening, 2D: Back side surface, 2E ... Mounting portion, 3 ... Radiator, 3A ... Heat dissipation structure, 3B ... Bottom surface, 4 ... Light source unit, 41 ... Substrate, 42 ... Bottom surface, 43 ... Light emitting portion, 44 ... LED element, 45 ... light emission center point, 4A ... support substrate, 4B ... bottom surface, 4C, 4E ... insulating sheet, 4D ... screw, 4F ... light shielding plate, 4G ... front side surface, 5 ... sub lens, 51 ... lens part, 52 ... Connecting portion, 53 ... Optical center position, 5A ... Screw, 5B ... Spacer, 6 ... Main lens, 6A ... Lens portion, 6B ... Mounting portion, 6C ... Screw, 6D ... End, 6E ... Bottom, 61R, 61L , 62R, 62L, 63R, 63L ... partial lens, 63 ... partial lens (Concave lens), 64R, 64L ... partial lens (convex lens), 70 ... condensed light beam, 71R, 71L, 72R, 72L, 73R, 73L ... light (before refraction), 75R, 75L, 76R, 76L, 77R, 77L ... ... light (after refraction), 8 ... illumination area, 8A ... far end area, 8B ... intermediate area, 8C ... center area, 80 ... road, 81 ... roadway, 82 ... shoulder, 9 ... pole, P ... light center position, Q: optical axis, X: longitudinal direction, Y: width direction, θ1, θ2, θ3 ... angular region, θA: angular direction (far end region direction), θB: angular direction (intermediate region direction), θC: direct downward direction ( Center area direction).

Claims (11)

A road illumination device that illuminates a long illumination area having a width according to a road width and having a predetermined length in the longitudinal direction of the road,
A box-shaped device body installed above the road and having a lower opening at the bottom;
A light source unit provided in the apparatus main body, having a plurality of LED elements arranged in the longitudinal direction of the road, and emitting a diffused light beam from the LED elements toward the road through the lower opening;
A sub-lens that is provided below the light source unit and emits a fan-shaped condensed light beam that spreads along the road longitudinal direction by collecting the diffused light beam from the LED element in the road width direction;
Provided below this sub-lens, the condensed light beam collected by the sub-lens as a whole is emitted toward the illumination area, and part of the condensed light beam is refracted along the longitudinal direction of the road for illumination. A road illumination device comprising: a main lens that emits light toward a far end region in the region. The road lighting device according to claim 1,
The main lens has a saddle shape that extends in the road width direction and curves downward along the road longitudinal direction, and allows incident light of the condensed light flux to enter between the bottom and the end of the curved portion. One or more partial lenses which refract and radiate | emit to an illumination area | region are formed, The road illuminating device characterized by the above-mentioned. The road lighting device according to claim 2,
The main lens has a convex lens having an optical axis in the direction of the far end region of the illumination region as the partial lens. The road lighting device according to claim 2,
The main lens has a concave lens having an optical axis in the direction of the central area of the illumination area as the partial lens. The road lighting device according to claim 2,
The main lens, as the partial lens, is a convex lens that emits a part of the light emitted toward the intermediate region between the central region and the far end region of the illumination region toward the far end region. A road lighting device comprising: The road lighting device according to claim 2,
The main lens, as the partial lens, has a convex lens that emits a part of light emitted toward the far end from the illumination area of the condensed light flux toward the far end area. The road lighting device according to claim 2,
The main lens, as the partial lens, directs part of the light emitted toward the central region of the illumination region of the condensed light flux toward the intermediate region between the central region and the far end region, or the far end region. A road illumination device having a concave lens that emits light. The road lighting device according to claim 1,
The main lens has a saddle shape that extends in the road width direction and curves downward along the road longitudinal direction, and has a thickness from the bottom portion toward the intermediate portion between the bottom portion and the end portion in the curved portion. A road lighting device characterized by being formed so as to be gradually thicker. The road lighting device according to claim 1,
The main lens has a saddle shape that extends in the road width direction and curves downward along the road longitudinal direction, and has a thickness from the end portion toward the intermediate portion between the end portion and the bottom portion in the curved portion. The road lighting device is characterized in that it is formed so as to gradually become thicker. The road lighting device according to claim 1,
While including a plurality of the light source units arranged in parallel in the road width direction,
Each of the light source units includes the sub lens,
The main lens diffracts and diffuses the individual condensed light beams collected by these sub lenses at an arbitrary depression angle along the road longitudinal direction. The road lighting device according to claim 1,
The apparatus body has an upper opening at the top,
A road lighting device comprising a heat dissipating structure that is exposed to the outside of the apparatus main body through the upper opening, and that dissipates heat generated by the LED elements of the light source unit to the outside of the apparatus main body.

Images