JP2014078385A - Lens and road illumination device - Google Patents

Abstract

A lens and a road lighting device that prevent light from being emitted in an undesired direction are provided.
When a lens surface 44a combined with unevenness is extended and light is inevitably emitted to the emission avoidance range 51, the lens surface 44a is terminated at that portion, and the planar incident that continues from the end is bent. By disposing a non-lens part 61 including the surface 44b (for example, forming the total reflection surface 62), the light path is switched in a direction that cannot be controlled by extending the continuous lens surface 44a.
[Selection] Figure 7

Description

  The present invention relates to a road illuminating device that is installed on a lens attached to a light source such as an LED and a post on a side of the road to illuminate a lower road.

  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, an LED (light emitting diode) with a lens has been adopted as a light source 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 also required to prevent extra light from leaking into a private house on the side of the road.

  However, when manufacturing a lens by molding a resin in a mold for mass production, the shape is limited to make it easy to pull out from the mold or mold, so it is not possible to manufacture a lens that meets the above requirements. difficult. In addition, the request | requirement which prevents that a light is inject | emitted in the direction which is not desired is not restricted to the lens of a road illuminating device.

  The present invention is intended to solve the above-described problem, and an object of the present invention is to provide a lens capable of preventing incident light from being emitted in an undesired direction and a road lighting device using the lens. It is said.

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

[1] A continuous lens surface that refracts and emits light incident from a light source in a direction away from a desired emission avoidance range that avoids light emission is terminated immediately before light leaks into the emission avoidance range; A lens having a non-lens part next to it.

  In the said invention, a non-lens part is arrange | positioned next to the continuous lens surface. The continuous lens surface causes the light from the light source to be refracted and emitted in a direction away from a desired emission avoidance range that avoids light emission, and is terminated immediately before light leaks into the emission avoidance range. The non-lens portion is provided next to the terminated lens surface. Thereby, the light distribution is controlled so that the light from the light source does not enter the emission avoidance range. The lens surface is a curved entrance surface or exit surface, and the non-lens portion is a portion that does not exhibit the lens effect.

[2] The lens according to [1], wherein the non-lens portion includes an incident surface that is bent from the end of a continuous lens surface.

  In the above invention, the non-lens portion is an incident surface that is bent from the end of the continuous lens surface, so that the path of light passing near the end of the lens surface and the path of light passing through the non-lens portion are greatly different. A range where no light is emitted (an emission avoidance range) can be formed between them.

[3] The non-lens part has a space part that forms a boundary surface that totally reflects the light on the path of the incident light, and emits light totally reflected by the boundary surface. The lens according to [1] or [2].

  In the above-described invention, the light path can be greatly changed by totally reflecting the light at the non-lens portion, and the light can be emitted in an unreasonable direction on the continuous lens surface.

[4] The lens according to [1], wherein the non-lens portion has a through hole that allows light from a light source to pass therethrough.

  In the above-described invention, by passing the light through the hole as it is, the lens effect at that portion can be completely eliminated. In addition, in the vicinity of the hole, it is not necessary to secure the minimum thickness required when the lens is continued, so the degree of freedom of the shape of the lens surface is increased and the refraction of light is increased to widen the control range. Can do.

[5] The lens according to any one of [1] to [4], wherein the lens has a concave portion that accommodates a light source that can be regarded as a substantially point light source, and the concave portion is attached to the light source.

  In the above-described invention, since the angle range in which light is incident from the light source is wide, it is difficult to control so that light is not emitted to a desired emission avoidance range with only a continuous lens surface, and the effect of providing a non-lens portion Is big.

[6] The lens according to [5], wherein the light source is a light emitting diode.

[7] Used in a road lighting device that illuminates a road from above to below,
Any one of [1] to [6], wherein the non-lens portion is provided in a portion where the light cannot be controlled by the continuous lens surface so that the light is not emitted outside the road that should not be illuminated. The lens according to one.

  In the said invention, a non-lens part acts so that light may not be radiate | emitted in the range which should not be illuminated outside a road.

[8] A road lighting device that illuminates a road from below to above,
A light source;
The lens according to any one of [1] to [6], in which light emitted from the light source is incident;
A road lighting device characterized by comprising:

  According to the lens and the road illumination device of the present invention, it is possible to prevent light from being emitted in unnecessary directions.

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 an example of the lens from which light leaks back. 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 lens provided with the prism, and the course of light. It is a figure which shows the front surface, lower surface, plane, upper surface, and side surface of the lens shown in FIG. It is explanatory drawing which shows the cross section of the lens provided with the through-hole, and the course of light. It is a figure which shows the front surface, lower surface, plane, upper surface, and side surface of the lens shown in FIG.

  Hereinafter, various 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 includes a base 12 that houses a metal fitting for fixing the road lighting device 10 to the support column 3 and a terminal block for power supply, and a horizontally-oriented substantially rectangular shape that extends forward from the base 12. And a main body portion 14 having a relatively 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 molten resin in a mold and solidifying it.

  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. Further, light is not emitted in a predetermined angle range on the rear side (an emission avoidance range 51 with hatching in the drawing). The injection avoidance range 51 is provided, for example, so as not to illuminate a private house beside the road.

  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.

  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.

  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 has a continuous lens surface portion 44a as a lens surface that is smoothly and continuously curved by combining a convex surface and a concave surface. Further, a non-lens surface portion 44b is provided as a substantially flat incident surface that is bent from the end of the continuous lens surface portion 44a. The LED 34 is in a position shifted rearward from the center of the lens 42 in the width direction W of the road 2. In addition, the lens surface said here is an uneven | corrugated curved surface, and shall exclude a plane.

  When the continuous lens surface portion 44a combining the convex surface and the concave surface is extended further rearward than the terminal position shown in FIG. 6, light inevitably leaks into the emission avoidance range 51 as in the lens 46 shown in FIG.

  Therefore, in the lens 42 shown in FIG. 6, when the continuous lens surface portion 44 a is continued rearward, the continuous lens surface portion 44 a is terminated just before the point where light starts to leak into the emission avoidance range 51, and the non-continuation is continued from the end. A lens surface portion 44b is formed. A boundary portion between the continuous lens surface portion 44 a and the non-lens surface portion 44 b and a portion through which incident light from the non-lens surface portion 44 b passes are the non-lens portion 50.

  The lens surface including the continuous lens surface portion 44 a controls the light so that the light incident from the light source 44 is refracted in the direction away from the emission avoidance range 51 and emitted. The smoothly curved lens surface is terminated immediately before light leaks into the emission avoidance range 51 when the lens surface is further continued, and a non-lens portion 50 is provided next to the terminated lens surface. Here, if the continuous lens surface portion 44a is further continued, light leaks to a range that should not be illuminated outside the road 2 (emission avoidance range 51). Therefore, the continuous lens surface portion 44a is terminated and a non-lens portion is adjacent thereto. 50 is provided.

  As shown in FIG. 6A, the light incident on the continuous lens surface portion 44a near the boundary with the non-lens surface portion 44b is refracted forward (in a direction away from the emission avoidance range 51), and the boundary with the continuous lens surface portion 44a. Light incident on the nearby non-lens surface portion 44b is refracted backward. That is, since light is refracted in a direction away from each other before and after the boundary between the end of the continuous lens surface portion 44a and the non-lens surface portion 44b, a region where no light is emitted (an emission avoidance range 51) is formed therebetween.

  FIG. 8 shows an equi-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 light distribution in the width direction W of the road 2, the light distribution center is shifted from the position of the appliance to the opposite shore side of the road 2 even though the road lighting device 10 is installed almost horizontally. It is the center in the width direction. 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 decreases immediately after leaving the road 2.

  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.

  The light distribution in the width direction W of the road 2 is mainly controlled by the shape of the incident 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.

  Next, another form of lens that avoids light distribution to the emission avoidance range 51 will be described.

  9 and 10 show a lens 60 having a prism as a non-lens portion. FIG. 9 shows a cross section and an optical path of the lens 60 in the width direction W of the road 2. FIG. 10A is a perspective view of the lens 60, and FIG. 10B shows the front, side, bottom, top, and back of the lens 60. The attachment method to the road lighting device 10 is the same as that of the lens 42, and the description thereof is omitted.

  The lens 60 has a shape in which a protruding portion 61 protruding rearward is added to an end portion on the rear side of the lens 42. The shape of the portions other than the protruding portion 61 (the continuous lens surface portion 44a, the non-lens surface portion 44b, the emission surface 45, etc.) is almost the same as that of the lens 42. In the lens 60, the protruding portion 61 including the non-lens surface portion 44b is a non-lens portion.

  A space 63 for forming a boundary surface 62 that totally reflects a part of the light incident from the non-lens surface portion 44b is provided inside the protruding portion 61 of the lens 60. Specifically, a curved boundary surface (total reflection surface 62) is formed on the path of light incident from a portion close to the boundary with the continuous lens surface portion 44a in the non-lens surface portion 44b. As described above, a space 63 is formed in the protrusion 61.

  A concave portion 64 having a concave lens effect curved in a concave shape is formed in a portion where the light totally reflected by the total reflection surface 62 is emitted from the protruding portion 61. Thereby, the light emitted from the concave portion 64 is slightly diffused. The light totally reflected by the total reflection surface 62 is emitted from the concave portion 64 in the direction of irradiating the road 2.

  Of the light incident from the non-lens surface portion 44b, light incident at an angle close to the horizontal direction (W direction) in the drawing does not reach the total reflection surface 62 but passes through the protruding portion 61 via the space portion 63. The light emitted from the protrusion 61 reaches the inner wall of the road lighting device 10 and does not leak out of the road lighting device 10.

  Since the lens 60 totally reflects incident light from the non-lens surface portion 44b by the total reflection surface 62 and emits the light toward the road 2 side, more light can be directed to the illumination of the road 2 than the lens 42. .

  Although the lens 60 has a complicated shape by providing the protruding portion 61, the angle of each surface is an angle at which the mold can be removed, and there is no problem in resin molding.

  Next, another type of lens that reduces the light distribution to the emission avoidance range 51 will be described.

  11 and 12 show a lens 70 provided with a through hole 71 as a non-lens portion. FIG. 11 shows a cross section of the lens 70 and the optical path in the width direction W of the road 2. FIG. 12A is a perspective view of the lens 70, and FIG. 12B shows the front, side, bottom, top, and back of the lens 70. The attachment method to the road lighting device 10 is the same as that of the lens 42, and the description thereof is omitted.

  In the lens 70, a through hole 71 as a non-lens portion is provided in a portion corresponding to the hit of the non-lens surface portion 44 b on the rear side of the lens 42. By providing the through hole 71, it is not necessary to secure the minimum thickness necessary for resin molding. As a result, the degree of freedom of the shape and angle of the entrance surface 72 and the exit surface 73 in the vicinity portion 74 of the through hole 71 is increased, and control is possible up to the light ray P1 passing through the vicinity portion 74 of the through hole 71, thereby expanding the control range. Can do.

  On the other hand, since the light ray P2 radiated rearward through the through hole 71 passes through the hole portion without the lens effect as it is, it is possible to reduce the light reaching an extra portion on the sidewalk side.

  The light ray P2 passing through the through hole 71 goes straight, and the light passing through the vicinity portion 74 (the terminal portion of the continuous lens surface) is refracted to the road side (front side), so the angle range therebetween becomes the emission avoidance range 51. The light passing through the through hole 71 may reach the inner wall of the road lighting device 10 so as not to leak out of the road lighting device 10.

  Of the entrance surface 72 and the exit surface 73 of the lens 70, the shape of the portion excluding the vicinity portion 74 of the through hole 71 is substantially the same as the continuous lens surface portion 44 a and the exit surface 45 of the lens 42. In addition, the shape of the lens 70 is a shape which does not have a problem in resin molding, and can be manufactured by resin molding.

  As described above, in the lens 70, the continuous lens surface exits by refracting the light incident from the light source in a direction away from the emission avoidance range 51 and exiting immediately before the light leaks to the emission avoidance range 51, and next to it. It has a through hole 71 as a non-lens portion. By providing the through hole 71, the degree of freedom of the shape of the lens surface in the vicinity 74 of the through hole 71 is widened, and light can be controlled by giving this part a high lens effect. For example, when a smoothly continuous lens surface is continued to the rear end as in the lens 46 shown in FIG. 7, the angle of the incident surface is limited in order to secure the minimum thickness due to restrictions on resin molding. As a result, light is emitted to the emission avoidance range 51, but this can be reduced by the lens 70.

  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 shapes of the lenses 42, 60, and 70 shown in the embodiment are merely examples, and the present invention is not limited thereto. In particular, the shape of the continuous lens surface portion 44a and the shape of the emission surface 45 may be arbitrarily determined according to a necessary light distribution pattern.

  In the lens 42 shown in the embodiment, the continuous lens surface 44a, which is the entrance surface, is terminated to terminate the continuous lens surface. However, the lens surface may be terminated by the exit surface 45. For example, a configuration may be adopted in which the exit surface 45 that is continuously curved in the unevenness is terminated at a certain position, and the exit surface 45 is bent from the end and continues with a flat exit surface.

  For example, the road lighting device 10 is not limited to the one that is mounted substantially horizontally on the upper portion of the column 3 that is installed on the side of the road 2, and may be mounted to be inclined to the opposite bank side of the road 2. Alternatively, it may be attached to the tip of an arm or the like that slightly extends inward of the road 2. Further, the road lighting device 10 may be installed at the four corners of the intersection to illuminate the sidewalks in and around the intersection.

  The lenses 42, 60, and 70 do not need to be a lens unit in which a plurality of lenses 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
DESCRIPTION OF SYMBOLS 40 ... Lens unit 42 ... Lens 43 ... Concave 44 ... Incident surface 44a ... Continuous lens surface part 44b ... Non-lens surface part 45 ... Outgoing surface 46 ... Back leaking lens 50 ... Non-lens part 51 ... Ejection avoidance range 60 ... Lens 61 ... Projection 62 ... Total reflection surface 63 ... Space part 64 ... Concave part 70 ... Lens 71 ... Through hole 72 ... Incident surface 73 ... Outgoing surface 74 ... Lenses in the vicinity of the through hole P1, P2 ... Light rays

Claims (8)

A continuous lens surface that refracts and emits light incident from a light source in a direction away from a desired emission avoidance range that avoids light emission is terminated immediately before light leaks into the emission avoidance range, and next to it. A lens having a non-lens portion. The lens according to claim 1, wherein the non-lens portion includes an incident surface that is bent from the terminal end of a continuous lens surface. The non-lens part has a space part that forms a boundary surface that totally reflects the light on the path of the incident light, and emits light totally reflected by the boundary surface. Or the lens of 2. The lens according to claim 1, wherein the non-lens portion has a through hole that allows light from a light source to pass therethrough. The lens according to claim 1, further comprising: a concave portion that houses a light source that can be regarded as a substantially point light source, and being attached to the light source so as to cover the concave portion. The lens according to claim 5, wherein the light source is a light emitting diode. Used for road lighting devices that illuminate the road from above to below,
The said non-lens part is provided in the part which cannot control light by the said continuous lens surface so that light may not be inject | emitted in the range which should not be illuminated outside a road. The lens described in 1. A road lighting device that illuminates a road from above to below,
A light source;
The lens according to any one of claims 1 to 6, wherein light emitted from the light source is incident;
A road lighting device characterized by comprising:

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