JP2014078384A - Road illumination lens and road illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road illumination lens through which a road illumination device installed on the upper part of a supporting column erected on a roadside in the approximately horizontal direction can illuminate a road wholly in the cross direction, and to provide the road illumination device.SOLUTION: The shape of the emission surface of the lens controls the course of light radiated from an LED so that the light is distributed in a longitudinal direction L of a road 2 in symmetry around a road illumination device 10. The shape of the entrance surface of the lens mainly controls the course of the light so that the light distributed in a cross direction W of the road 2 in asymmetry around the road illumination device 10 is delivered to the other side of the road 2 but it is not delivered to the opposite side thereof.

Description

  The present invention relates to a lens and a road lighting device that are attached to a light source of a road lighting device that is installed on a column or the like on the side of a road and illuminates a road below.

  A road illuminating device that is installed on an upper portion of a support column standing on the side of a road and illuminates a lower road is usually installed at intervals of several tens of meters as shown in FIG. Therefore, it is required to illuminate the road in a long range in the longitudinal direction L. In recent years, LEDs (light emitting diodes) have been adopted as light sources due to demands for energy saving and the like. Thus, for example, Patent Documents 1 and 2 below disclose specially shaped lenses and road lighting fixtures that can efficiently illuminate the longitudinal direction of a road using LEDs as light sources.

JP 2010-177028 A Special table 2010-524170 gazette

  The lenses and road lighting fixtures disclosed in Patent Documents 1 and 2 efficiently illuminate the longitudinal direction of the road. However, when a road lighting device is attached to the upper part of a support column standing on the side of the road, it is required to illuminate the entire road in the width direction up to the opposite shore only with this road lighting device.

  Therefore, conventionally, the road lighting device is installed to be inclined obliquely toward the opposite bank side. However, when the road is wide like a three-lane road, the inclination angle becomes large. In addition, simply tilting makes the opposite shore side darker than the installation side. Furthermore, there is also a demand for reducing the inclination of the road lighting device from the standpoint of simplification of the column and the mounting structure to the column and an aesthetic viewpoint.

  The present invention is intended to solve the above-described problem, and a road that can illuminate the entire road in the width direction from a road lighting device installed above the side of the road even if the inclination of the fixture itself is reduced. An object of the present invention is to provide an illumination lens and a road illumination device.

  The gist of the present invention for achieving the object lies in the inventions of the following items.

[1] A lens that is installed above one side in the width direction of a road and that is attached to a light source of a road illumination device that illuminates a road below.
The path of light emitted from the light source is controlled so that the light distribution is symmetric about the lens in the longitudinal direction of the road, and the light distribution is asymmetric about the lens in the width direction of the road. The road illumination lens is characterized in that the path of the light is controlled so that

  In the above invention, since the light distribution is symmetric with respect to the longitudinal direction of the road, the road illumination device can uniformly illuminate the front and rear in the longitudinal direction of the road and has an asymmetric light distribution in the width direction of the road. It is possible to illuminate up to the opposite bank side of the road without tilting the road lighting apparatus toward the opposite bank side in a state where the road lighting apparatus is installed on the upper side of the support column installed on the side.

[2] The light distribution in the longitudinal direction of the road is controlled mainly by the shape of one of an incident surface on which light emitted from the light source is incident and an exit surface on which light incident from the incident surface is emitted. The road illumination lens according to [1], wherein the light distribution in the width direction of the road is controlled mainly by the shape of the other surface.

  In the above invention, the light distribution in the longitudinal direction of the road is mainly controlled by the shape of one of the entrance surface and the exit surface, and the light distribution in the width direction of the road is mainly controlled by the shape of the other surface. Since the light distribution control in the longitudinal direction and the light distribution control in the width direction are separated into the entrance surface and the exit surface, the design of the lens becomes easy.

[3] The road according to [2], wherein the light distribution in the width direction of the road is mainly controlled by the shape of the entrance surface, and the light distribution in the longitudinal direction of the road is mainly controlled by the shape of the exit surface. Lens for lighting.

[4] The road according to [2], wherein the light distribution in the width direction of the road is mainly controlled by the shape of the exit surface, and the light distribution in the longitudinal direction of the road is mainly controlled by the shape of the entrance surface. Lens for lighting.

[5] In the light path control in the width direction of the road, the light distribution to the opposite bank side of the road is increased, and the light distribution to the opposite side of the road is reduced with respect to the installation position of the road lighting device. The road illumination lens according to any one of [1] to [4], wherein:

  In the said invention, while illuminating brightly to the opposite bank side of a road, it is prevented that the private house etc. by the side of the road by the side of the installation of the said road lighting apparatus are illuminated unnecessarily.

[6] The light source is a light emitting diode that emits light in a range from a center of a sphere to a substantially hemisphere,
The road illumination lens according to any one of [1] to [5], wherein the light-emitting diode has a recess into which the light-emitting diode is inserted.

  In the above invention, all the light emitted from the light emitting diode can be incident on the lens for light distribution.

[7] A road illumination device that is installed above one side in the width direction of the road and illuminates the road below.
A light source;
The road illumination lens according to any one of [1] to [6], which controls a path of light emitted from the light source;
A road lighting device characterized by comprising:

  According to the road lighting lens and the road lighting device according to the present invention, the longitudinal direction of the road can be evenly illuminated left and right, and the width of the road can be reduced even if the inclination of the road lighting device installed above the roadside is reduced. The entire direction can be illuminated.

It is a figure which shows the example of installation of the road illuminating device which concerns on embodiment of this invention. 1 is a perspective view showing a road lighting device according to an embodiment of the present invention. It is a figure which shows the front of the road illuminating device which concerns on embodiment of this invention, a lower surface, an upper surface, a back surface, and a side surface. It is a figure which shows the inside (array of light emitting modules) of a road illuminating device. It is a figure which shows the front of the lens unit provided in a light emitting module, a side surface, and an AA cross section. It is explanatory drawing which shows the cross section of the lens in the width direction and longitudinal direction of a road, and the course of light. It is a figure which shows the isoilluminance distribution of the lens shown in FIG. It is explanatory drawing which shows the cross section of the 2nd type lens in the width direction and longitudinal direction of a road, and the course of light.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an installation example of a road lighting device 10 according to an embodiment of the present invention. The road illuminating device 10 is attached to the upper part of the support column 3 erected on the side of the road 2 to illuminate the road and its surroundings from above. The road lighting device 10 is installed at intervals of several tens of meters (for example, 40 m) along the longitudinal direction of the road. In each figure, the arrow L indicates the longitudinal direction (longitudinal direction) of the road 2, and the arrow W indicates the width direction (transverse direction) of the road 2. The direction indicated by the arrow W is the opposite bank side of the road. The direction in which the road 2 is located (the direction indicated by the arrow W) with respect to the installation position of the road illumination device 10 is called “front”, and the opposite side is called “rear”.

  FIG. 2 is a perspective view of the road lighting device 10 as viewed obliquely from above and front. FIG. 3 shows a front surface, a lower surface, an upper surface, a back surface, and a side surface of the road lighting device 10. The road lighting device 10 includes a housing 11 having a light irradiation port on the lower surface side, a plurality of light emitting modules 30 (see FIG. 4) housed in the housing 11, and an unillustrated control for driving the light emitting modules 30. It consists of a circuit. The main part of the housing 11 is a cast product manufactured by pouring molten metal into a mold, cooling and solidifying it.

  A housing 11 of the road lighting device 10 is a horizontally long, substantially rectangular shape that extends forward from the base 12 and a base 12 that houses metal fittings for fixing the road lighting device 10 to the column 3 and a power terminal block. It is comprised from the main-body part 14 which comprised the comparatively thin hollow box shape.

  A substantially rectangular irradiation port 16 is opened on the lower surface of the main body 14. A translucent plate 18 is fitted in the irradiation port 16 with packing interposed therebetween. The translucent plate 18 is a plate-like member that transmits light, and is made of glass, resin, or the like.

  FIG. 4 shows a state in which the road lighting device 10 with the translucent plate 18 removed is viewed from the lower surface side. A plurality of light emitting modules 30 are accommodated in the main body 14 so as to face the irradiation port 16 from the inside of the main body 14.

  The light emitting module 30 is configured by arranging a plurality of LEDs (light emitting diodes) 34 on a flat substrate and covering each LED 34 with a lens 42. Here, 14 LEDs 34 covered with lenses 42 are arranged in a 2 × 7 matrix on a rectangular substrate. In the main body 14, the six light emitting modules 30 are arranged in a 3 × 2 matrix and attached. The number of light emitting modules 30 attached can be increased or decreased. The LED 34 emits light in a range from the center of the sphere to a substantially hemisphere. That is, light is emitted like a point light source provided on the surface side of the substrate.

  FIG. 5 shows a front surface, a side surface, and an AA cross section of the lens unit 40 included in the light emitting module 30. Fourteen lenses 42 that cover the fourteen LEDs 34 arranged in one light emitting module 30 are integrally molded into a lens unit 40. The lens unit 40 is manufactured by molding a resin.

  Next, the shape of the lens 42 included in the lens unit 40 will be described.

  6A shows the BB cross section and optical path of the lens 42 included in the lens unit 40, and FIG. 6B shows the CC cross section and optical path of the lens 42. FIG. 4A shows a cross section of the lens 42 in the transverse direction (width direction W) of the road 2, and FIG. 4B shows a cross section of the lens 42 in the longitudinal direction (longitudinal direction L) of the road 2.

  The lens 42 is flattened by dividing the sphere into two by a plane passing through the center thereof, and has a shape with a recess 43 on the cut surface. When the lens unit 40 is mounted on the substrate on which the LEDs 34 are arranged, the concave portions 43 of the lenses 42 are covered with the respective LEDs 34, and the LEDs 34 are accommodated at predetermined positions in the concave portions 43.

  As shown in FIG. 2B, the lens 42 controls the path of the light emitted from the LED 34 so that the light distribution is symmetric about the lens 42 in the longitudinal direction (L direction) of the road 2. . On the other hand, as shown in FIG. 5A, the lens 42 controls the path of light in the width direction (W direction) of the road 2 so that the light distribution is asymmetric about the lens 42. Specifically, in the control in the width direction of the road 2, the light traveling toward the opposite shore side (forward) of the road 2 is increased, and the light traveling toward the opposite side (backward) of the road 2 with respect to the installation position of the road lighting device 10 is reduced. Control to do.

  In the lens 42 shown in FIG. 6, the light distribution mainly in the width direction W of the road 2 is controlled by the shape of the incident surface 44 (the inner surface of the concave portion 43 of the lens 42) on which the light emitted from the LED 34 is incident. The light distribution in the longitudinal direction L of the road 2 is mainly controlled by the shape of the road.

  As shown in FIG. 6A, the width direction (W direction) control of the road 2 is mainly performed on the incident surface. The exit surface in the width direction (W direction) of the lens 42 has a simple convex shape, and the light path is controlled so that the light distribution is asymmetric about the lens 42 at the entrance surface.

On the other hand, as shown in FIG. 4B, the longitudinal direction (L direction) of the road 2 is mainly controlled on the exit surface. The entrance surface in the longitudinal direction (L direction) of the lens 42 has a simple shape of a semi-circle or a semi-ellipse, passes light while minimizing light refraction, and controls the path of light at the exit surface. .

  That is, the emission surface 45 has a symmetrical shape with respect to the center of the lens 42 in the longitudinal direction L of the road. In general, the shape of the ellipsoid obtained by rotating the ellipse by 180 degrees about its major axis is a half-ellipsoid curved surface divided by a plane passing through the major axis, and the center of the lens in the longitudinal direction L of the road It is symmetrical with respect to. The LED 34 is located at the center position of the lens 42 in the longitudinal direction L of the road 2.

  The exit surface 45 has a larger curvature than the entrance surface 44 in the width direction W of the road 2. On the other hand, the exit surface 45 has a smaller curvature than the entrance surface 44 in the longitudinal direction L of the road 2.

  On the entrance surface 44, the cross section of the road 2 in the longitudinal direction L (see FIG. 6B) has a substantially semicircular or semielliptical shape. The cross section of the road 2 in the width direction W (see FIG. 6A) is obtained so that the above-described light distribution (light distribution with increased light to the front (opposite side) and less light to the rear) can be obtained. It is asymmetric with respect to the center of the lens and has a shape combining a convex surface and a concave surface. Further, the LED 34 is at a position shifted rearward from the center of the lens 42 in the width direction W of the road 2.

  In the cross section in the width direction W of the road 2, the incident surface 44 has a concave first concave surface portion 44 a as viewed from the LED 34, a convex convex surface portion 44 b as viewed from the LED 34, and the LED 34 from the rear side to the front side. The concave second concave surface portion 44c is smoothly connected.

  When the light from the LED 34 is transmitted without being refracted, the semicircular concave surface centering on the LED 34 becomes the incident surface, but the first concave surface portion 44a is compared with the semicircular concave surface. As a result, the incident angle to the incident surface is increased almost horizontally and acts to bend the incident light forward (opposite side) and slightly diffuse. The light incident on the first concave surface portion 44a is refracted further forward when it exits from the exit surface 45.

  Compared with the first concave surface portion 44a, the convex surface portion 44b has a larger effect of collecting incident light. The light incident on the convex surface portion 44b is further refracted forward when it exits from the exit surface 45, and illuminates the range where the road 2 exists. The road 2 is illuminated more brightly by the light collection at the convex surface portion 44b. The convex surface portion 44b has a smaller curvature than the first concave surface portion 44a and the second concave surface portion 44c.

  Compared to the semicircular concave surface described above, the second concave surface portion 44c is also made closer to the horizontal and has a larger incident angle on the incident surface, and the light traveling further beyond the opposite shore of the road 2 is transmitted to the road. Bends back to 2 and plays a slightly diffusing function. The light incident from the second concave surface portion 44c is incident from the normal direction with respect to the emission surface 45 and is emitted without being refracted.

  Thus, although the exit surface 45 is a simple convex surface, the forward (opposite side) light is increased in the width direction W of the road 2 by the shift of the shape of the entrance surface 44 and the position of the LED 34. Asymmetrical light distribution that reduces the amount of light behind.

  FIG. 7 shows the illuminance distribution on the ground by the road lighting device 10. The road lighting device 10 is attached to a column erected on the side of the road 2 at an inclination of 5 degrees at a position 10 m above the road surface.

  The light distribution pattern is symmetrical in the longitudinal direction L of the road 2 with respect to the installation position of the road illumination device 10 (appliance position in the figure), and the road 2 is illuminated in a wide range in the longitudinal direction.

  On the other hand, in the width direction W of the road 2, an asymmetric light distribution pattern centering on the appliance position is formed. That is, although the road lighting device 10 is installed almost horizontally, the light distribution center in the width direction W of the road 2 is shifted from the appliance position to the opposite bank side of the road 2 and is almost in the center in the width direction of the road 2. It has become. Further, beyond the road 2, the light gradually weakens as the distance from the road 2 increases. On the other hand, in the area behind the appliance position, the light distribution is such that the brightness suddenly decreases as the distance from the road 2 increases.

  By such a light distribution, the side of the road 2 (rear side) while the road 2 is brightly illuminated in the entire width direction by the road lighting device 10 mounted horizontally or with a small inclination on the column 3 standing on the side of the road 2 The light that reaches the private houses of the city can be weakened. Further, the road 2 can be illuminated in a wide range in the longitudinal direction L symmetrically about the installation position of the road lighting device 10.

  Further, the light distribution in the width direction W of the road 2 is mainly controlled by the shape of the entrance surface 44 of the lens 42, and the light distribution in the longitudinal direction L of the road 2 is mainly controlled by the shape of the exit surface 45. The lens having different light distribution patterns in the width direction W and the longitudinal direction L can be easily designed.

  FIG. 8 shows a second type lens 42 </ b> B provided in the lens unit 40. FIG. 8A shows the cross section and optical path of the lens 42B in the transverse direction (width direction W), and FIG. 8B shows the cross section and optical path of the lens 42B in the longitudinal direction (longitudinal direction L).

  As shown in FIG. 6B, the second type of lens 42B is symmetric with respect to the lens 42B in the longitudinal direction (L direction) of the road 2 like the lens 42 shown in FIG. The path of the light emitted from the LED 34 is controlled so that Further, as shown in FIG. 5A, the lens 42B controls the path of light in the width direction (W direction) of the road 2 so as to have an asymmetric light distribution around the lens 42B. Specifically, in the light distribution control in the width direction W of the road 2, the control is performed such that the light traveling toward the opposite bank side of the road 2 is increased and the light traveling toward the rear of the installation position of the road lighting device 10 is decreased. However, compared to the lens 42, the light is distributed to the rear to some extent.

  Further, the LED 34 is at a position shifted rearward in the width direction W of the road 2 from the center of the lens 42B. In the lens 42 </ b> B, the exit surface 45 has a smaller curvature than the entrance surface 44 in the width direction W and the longitudinal direction L of the road 2.

  In the lens 42 </ b> B shown in FIG. 8, the incident surface 44 </ b> B on which the light emitted from the LED 34 enters has a hemispherical shape, and the light distribution is controlled in the width direction W of the road 2 mainly by the shape of the exit surface 45 </ b> B. The direction L is almost uncontrolled.

  In other words, the incident surface 44B has a symmetrical shape with respect to the center of the lens 42B in both the width direction W of the road and the longitudinal direction L of the road. It is generally hemispheric.

  On the exit surface 45B, the cross section of the road 2 in the longitudinal direction L (see FIG. 5B) forms a substantially semicircular shape that is symmetrical with respect to the center of the lens 42B. The cross-section in the width direction W of the road 2 (see FIG. 5A) is asymmetric with respect to the center of the lens 42B so that light distribution can be obtained with increased light on the opposite shore and slightly less light on the rear. It is a simple shape.

  In the cross section of the road 2 in the width direction W, the emission surface 45B has a shape in which the planar shape portion 45Ba and the curved surface shape portion 45Bb, which is a part of a substantially spheroid, are connected from the rear side to the front side. The planar shape portion 45Ba controls light traveling backward from the installation position of the road lighting device 10, and the curved surface shape portion 45Bb controls light traveling forward.

  For example, the lens 42B is suitable for a case where the lens 42B is attached to an upper portion of a support column provided at four corners of an intersection to illuminate a sidewalk in and around the intersection. Even when the lens 42B is used, the road 2 is brightly illuminated in the entire width direction or near the center of the intersection, even if the lens 42B is mounted horizontally or with a small inclination on the column 3 standing on the side of the road 2 or at the corner of the intersection. And can illuminate up to the opposite shore. Further, it is possible to weaken the light reaching the private house beside the sidewalk while illuminating the sidewalk on the rear side of the road lighting device 10 to some extent. In addition, the longitudinal direction L of the road 2 or the intersection can be illuminated in a wide range symmetrically with respect to the installation position of the road illumination device 10.

  Although the lens 42B does not substantially control the light distribution in the longitudinal direction L of the road 2, the light distribution control in the longitudinal direction L of the road 2 may be performed on the incident surface 44B. That is, the shape of the exit surface may be a lens that mainly controls the light distribution in the width direction W of the road 2, and the shape of the entrance surface may be a lens that mainly controls the light distribution in the longitudinal direction L of the road 2. In this case, it is possible to easily design a lens having different light distribution patterns in the width direction W and the longitudinal direction L of the road 2.

  The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.

  The shape of the lenses 42 and 42B shown in the embodiment is an example, and the present invention is not limited to this. That is, the light path from the light source is controlled so that the light distribution is symmetric about the lens in the longitudinal direction L of the road, and the light distribution is asymmetric about the lens in the width direction W of the road. Any lens that controls the path of light is included in the present invention. In the embodiment, one of the light distribution control in the width direction W of the road 2 and the light distribution control in the longitudinal direction L of the road 2 is performed on the entrance surfaces 44 and 44B, and the other is performed on the exit surfaces 45 and 45B. Although the function sharing is performed, the function sharing is not necessarily performed, and one surface may be configured to control the light distribution of both.

  The road illumination device 10 may be attached to, for example, the tip of an arm that extends slightly from the support 3 installed on the side of the road 2 to the inside of the road 2. That is, it is not limited to the side of the road, and may be installed above one side of the road. Further, the road lighting device 10 may be installed to be inclined to a certain degree (for example, 5 degrees) toward the opposite bank side. The road lighting device 10 may illuminate the road from above one side of the road, and may be installed at, for example, four corners of an intersection.

  The lenses 42 and 42B do not have to be a lens unit 40 in which a plurality of lenses 42 and 42B are assembled. A single lens may be used. The light source is not limited to the LED 34.

  The shape of the housing 11 and the like of the road lighting device 10 shown in the embodiment is an example, and is not limited to this.

DESCRIPTION OF SYMBOLS 2 ... Road 3 ... Support | pillar 10 ... Road illuminating device 11 ... Housing 12 ... Base 14 ... Main body 16 ... Irradiation port 18 ... Translucent plate 30 ... Light emitting module 34 ... LED
40 ... Lens unit 42, 42B ... Lens 43 ... Concave 44, 44B ... Incident surface 44a ... First concave surface 44b ... Convex surface 44c ... Second concave surface 45, 45B ... Outgoing surface 45Ba ... Planar shape portion 45Bb ... Curved surface shape portion

Claims (7)

A lens that is installed above one side in the width direction of the road and is attached to a light source of a road lighting device that illuminates the road below,
The path of light emitted from the light source is controlled so that the light distribution is symmetric about the lens in the longitudinal direction of the road, and the light distribution is asymmetric about the lens in the width direction of the road. The road illumination lens is characterized in that the path of the light is controlled so that The light distribution in the longitudinal direction of the road is mainly controlled by the shape of one of the incident surface on which light emitted from the light source is incident and the emission surface on which light incident from the incident surface is emitted, The road illumination lens according to claim 1, wherein light distribution in a width direction of the road is mainly controlled by a shape of a surface. The road illumination lens according to claim 2, wherein light distribution in the width direction of the road is mainly controlled by a shape of an entrance surface, and light distribution in a longitudinal direction of the road is mainly controlled by a shape of an exit surface. . The road illumination lens according to claim 2, wherein light distribution in the width direction of the road is mainly controlled by a shape of an exit surface, and light distribution in a longitudinal direction of the road is mainly controlled by a shape of an entrance surface. . In the control of the light path in the width direction of the road, the light distribution to the opposite bank side of the road is increased, and the light distribution to the opposite side of the road with respect to the installation position of the road illumination device is reduced. The road illumination lens according to any one of claims 1 to 4. The light source is a light emitting diode that emits light in a range from a sphere center to a substantially hemisphere,
The road illumination lens according to any one of claims 1 to 5, wherein the light-emitting diode has a recess into which the light-emitting diode is placed, and is covered with the light-emitting diode. A road lighting device that is installed above one side in the width direction of the road and illuminates the road below,
A light source;
The road illumination lens according to any one of claims 1 to 6, which controls a path of light emitted from the light source;
A road lighting device characterized by comprising:

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