KR20150032504A - Led road lamp - Google Patents

Abstract

The present invention provides an LED street lamp and includes LED light sources and a reflector assembly. The reflector assembly includes a pair of symmetrically arranged curved reflectors, standing back to back. The curved reflectors are respectively designed as continuous parabolic curved surfaces in a direction parallel to the road surface to reflect the light emitted from the LED light sources. Therefore, after being reflected, the light is radiated to a predetermined area in the direction parallel to the road surface. The LED street lamp can in one instance reflect most of the light emitted from the LED light sources within the predetermined area on the road surface. Therefore, the present invention can improve light efficiency of a system in one embodiment, and satisfy a requirement of an actual road for light distribution in another embodiment.

Description

LED street lamp {LED ROAD LAMP}

BACKGROUND OF THE INVENTION Field of the Invention [0002] The present invention generally relates to street lamps, and more particularly to street lamps using LEDs (light emitting diodes) as light sources.

As a new light source, many advantages, such as long lifetime, light efficiency, multi-color and directional light irradiation function in one light distribution, as well as operability under safety voltage, led to the development trend of next- . However, conventional LED streetlights have a light distribution curve similar to that of conventional light sources, which are generally distributed around a wide angle periphery, so that the light spot's illumination is sharply reduced from the central area to the outside, There are problems such as small survey areas and low remote illumination that are difficult to meet surface survey requirements. On one side, the illumination distance of the light source along the direction parallel to the road surface is short, and dark areas without illumination are formed in the road surface between light spots of adjacent streetlights. In other respects, other parts of the light are not illuminated on the road surface, but are illuminated in the longitudinal direction, leading to waste of lighting the roadway. At the same time, the uniformity of illumination of ordinary LED street lamps is not perfect, resulting in great inconvenience in energy wasting and night driving, and can lead to serious risks.

In order to solve the above problems, a typical method is to design an optical lens for designing the light distribution of the LED light source. The direction of light emission of the LED light source is changed through the lens so that the shading portion between adjacent light spots is removed to change the propagation direction to form a rectangular light strip on the road surface, Ensure the safety purpose of operation.

However, the use of optical lenses for designing the light distribution of LED light sources has a number of disadvantages: firstly, LED light sources with different characteristics require optical lenses with different diopters, and consequently between the lens and LED light sources Resulting in an unfavorable interchangeability of < RTI ID = 0.0 > Secondly, if glass is used as the lens material, processing complexity and high cost will be caused, while the use of PC resin will lead to lens life problems and generally life will be less than one year. If a conventional lamp shade is used directly, it may not match an integrated package type LED light source and may cause many disadvantages; Third, the energy of the light sources is not entirely illuminated within the effective area of the road surface, the illumination distance along the direction parallel to the road surface becomes shorter, and the illumination uniformity is not ideal.

Therefore, it is desirable to develop a new LED street lamp to solve the above problems.

It should now be understood that, in order to facilitate a basic understanding, the present invention is summarized in one or more aspects, the summary is not to scale with an outline of extensibility, but rather to identify certain elements of the invention, It is not. In contrast, the main purpose of the abstract is to provide some concepts in a simplified form, prior to the following more specific explanations.

In one aspect of the invention, an LED streetlight is provided. The LED streetlight includes LED light sources and a reflector assembly. The reflector assembly includes a pair of curved surface reflectors arranged back-to-back symmetrically. Each of the curved reflectors is designed as a continuous parabolic curved surface along a direction parallel to the road surface to reflect the light emitted from the LED light sources so that the light is reflected by a predetermined area along the direction parallel to the road surface after reflection .

In some designs, and additionally, each of the curved reflectors is designed as a continuous left and right asymmetrical arc shape along a direction perpendicular to the road surface, The LED light source located in each of the curved reflectors is mounted on one side of an arc shaped backing surface of the road surface so as to reflect light through one side of the arcuate shape facing the curved surface reflectors.

In another aspect of the invention, an LED streetlight is provided. The LED streetlights include a backboard with LED light sources and a reflector module for light reflection. The reflector module includes a plurality of reflector assemblies. Each reflector assembly includes a pair of curved reflectors that are symmetrically arranged to mate on two sides of the backboard, and each curved reflector is parallel to the road surface to reflect the light emitted from the LED light sources And is thus irradiated to a predetermined region along a direction parallel to the road surface after reflection.

In contrast to the prior art, the LED street lamps of the present invention provide a pair of symmetrically arranged curved reflectors with their backs, each curved reflector parallel to the road surface to reflect light emitted from the LED light sources It is designed as a continuous parabolic curved surface along one direction so that light can be irradiated to a predetermined region along the direction parallel to the road surface after reflection. By designing the reflectors as curved surfaces of a continuous parabolic curve, in addition to a portion of the light directly irradiated to the road surface, most of the light from the LED light sources can be irradiated to a predetermined area of the road surface after being reflected once, The illumination efficiency of the system can be greatly improved, and the irradiation distance of the light can be designed to be very long to meet the requirements of the actual roads for light distribution. In some designs, each of the curved reflectors is designed as a continuous left and right asymmetric circular arc shape along a direction perpendicular to the road surface, and the LED light source located in each of the curved reflectors is mounted on the arc- And reflects the light through the arc-shaped side facing the road surface in the predetermined area along the direction perpendicular to the road surface. Accordingly, most of the light will be able to be irradiated to the road surface and not be surveyed to the roadside area. In addition, the LED street lamps of the present invention may employ a modular design in which one or more reflector assemblies may be freely mounted on or removed therefrom, and thus light distribution requirements of different light intensities Which is very convenient.

BRIEF DESCRIPTION OF THE DRAWINGS The subject matter of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.
1 is a schematic view of an LED street light used for a road surface according to a preferred embodiment of the present invention.
2 is a schematic perspective view of a reflector module on one side of an LED streetlight in accordance with a preferred embodiment of the present invention.
Fig. 3 is a schematic perspective view of Fig. 2, taken along another direction.
Figure 4 is a schematic side view of the reflector module of Figure 2;
Fig. 5 is a plan view of Fig. 2. Fig.
Figure 6 is a side view of Figure 2;
7 is a graph of light distribution curves of LED streetlights used for specific road surfaces according to the present invention.
8 is a schematic plan view of a reflector module on one side of an LED streetlight according to another preferred embodiment of the present invention.
9 is a schematic view of a backboard corresponding to reflector assemblies on one side of an LED streetlight in accordance with a preferred embodiment of the present invention.
10 is a schematic view of an LED street light according to another preferred embodiment of the present invention.

Specific embodiments of the present invention will now be described. In the detailed description of these embodiments, it should be noted that for the sake of brevity, it is not possible for the specification herein to describe all the features of the actual embodiments in detail. In order to achieve the specific goals of a developer, such as tailoring system-related and business-related constraints that may vary from embodiment to embodiment, in a practical implementation process of any one embodiment, such as in any engineering or design project, It should be understood that implementation-specific decisions must be made. It should also be understood that such a development effort may be complex and time consuming but nevertheless would be a routine undertaking in design, manufacture, and production for those of ordinary skill in the art having the benefit of this disclosure , Which should not be understood to be insufficient for disclosure.

Unless otherwise specified, the technical and scientific terms used in the description and the claims have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. As used herein, terms such as " first "and" second "and the like do not specify any order, amount, or importance, but rather are used to distinguish between different components. Also, terms used herein in the singular and the like, and the like, do not denote any quantitative limitation and are used to denote at least one. &Quot; including, "" comprising," or " having, "and variations thereof, are intended to encompass the items listed thereafter and equivalents thereof as well as additional items. "Link," " link, " and other like terms are not limited to physical and mechanical connections, but may also include direct or indirect electrical connections.

1, there is shown a schematic diagram of an LED streetlight 10 used for a road surface 20 according to a preferred embodiment of the present invention. Only four LED streetlights 10 are shown in Fig. 1, two of which are located on one side 21 of the road surface 20 and two are located on the road surface 20, On the other side (22). The actual number of streetlights can be changed as needed. The LED street lamp 10 includes reflector modules 13 arranged symmetrically on two sides of the lamp post 11, the backboard 12 and the backboard 12.

The lamp post 11 is used to support the main body of the streetlight and can be a generally straight long column or a slightly tilted structure toward one side of the road surface or other structures corresponding to a specific road condition . ≪ / RTI > The back board 12 is used to install LED light sources and other control circuitry. The LED street light 10 may also include other elements such as a heat sink and the like. Since the lamp post 11, the control circuit on the back board 12, the heat sink and other elements are not the focus of the present invention, they have not been specifically described here. By way of example, in this embodiment, the backboard 12 includes pairs of backboards for installing corresponding reflector modules 13 each symmetrically arranged. In other embodiments, the pair of backboards 12 may also be integrated into a single backboard. Symmetrically arranged reflector modules 13 are each mounted on two sides of a single backboard.

When installing the streetlight 10 of this embodiment, two wings of the reflector modules 13 are required to be set in a direction parallel to the road surface 20 (shown in Fig. 1) The light reflected by the modules 13 may be irradiated on the two sides of the lamp post 11 along the road direction, respectively. Since the structures of the symmetrically arranged reflector modules 13 on the two sides are identical, only the reflector module 13 on one side will be described in the following texts.

As shown in Figures 2 and 3, schematic perspective views of a preferred embodiment reflector module 13 on one side along different directions are shown. In this embodiment, the reflector module 13 on one side includes one half portion of three parallel reflector assemblies 131 arranged in parallel, and the other side comprises three parallel reflector assemblies < RTI ID = 0.0 >Lt; RTI ID = 0.0 > 131 < / RTI > Only one half will be described here in detail, and the other half will not be repeated anymore. In other embodiments, the number of reflector assemblies 131 may be adjusted to, for example, one, two, or three or more, depending on actual requirements. Such a design allows the streetlight reflection system to have a modular configuration and to increase or decrease the number of corresponding reflector assemblies 131 to form different modular reflector modules 13. The reflector assemblies 131 on the reflector module 13 may be freely disassembled and assembled, which may include, for example, snap structures that can be adjusted to the lighting requirements at very convenient and different locations As shown in Fig. For example, only one reflector assembly 131 or reflector assemblies 131 on one side may be needed to meet the requirements for low brightness requirements, which saves cost. A plurality of reflector assemblies 131 may also be required in the case of high brightness requirements and a plurality of reflector assemblies 131 may be assembled parallel to the reflector module 13 with desired light distribution requirements This is very convenient.

To improve the optical efficiency of the system, each reflector assembly 131 is designed as a pair of curved reflectors arranged oppositely and symmetrically with inner walls 1311 set as reflective surfaces, In the example, it is designed as a full mirror reflection, for example by vacuum aluminizing technology to achieve a high reflectance and low cost reflective design. In other embodiments, other mirror surface material surface treatment processes, such as electroplating, polishing or spraying a reflective media film, may also be used. LED light sources 121 are set on the backboard 12 and positioned within each of the reflector assemblies 131. A portion of the light emitted by the LED light sources 121 is irradiated directly to the road surface 20 and the other portion is irradiated to the road surface 20 after being reflected by the reflective surface of the inner wall 1311. [ The reflective surface set on the inner wall 1311 of the present invention will be able to reflect the light emitted by the LED light sources 121 to a predetermined area on one side of the road surface 20, A distribution curve is located within a predetermined region.

4, a schematic side view of a curved reflector on one side of one reflector assembly 131 along a direction parallel to the road surface 20 is shown. The inner wall 1311 of the reflector assembly 131 is off-axis along a direction parallel to the road surface 20 to achieve the above setting requirements of the reflective surface of the inner wall 1311. [ It is designed in the form of a parabolic curved surface, which is calculated according to the law of reflection of light. In other words, along the direction parallel to the road surface 20, the illumination distance d of the light irradiated and reflected from the LED light sources 121 within the predetermined area of the road surface 20 is set to a parabola The irradiation distance d can be set as a multiple of three times, five times, or more of the height of the lamp post 11, for example, in order to meet light distribution requirements of an actual road, There will be. In a non-limiting embodiment, the parabolic curve shape off the axis of the inner wall 1311 is formed based on a plurality of contours calculated from a curve fitting algorithm, . The flexibility of the light distribution can be greatly improved since the irradiation distance d can be used to design a parabolic curve shape outside the corresponding axis by the law of light reflection according to actual requirements . In addition, the inner wall 1311 of the reflector assembly 131 is designed in a continuous, off-axis, parabolic curved shape so that, except for the portion of the light directly irradiated onto the road surface 20, Most of the light from the light source 121 will be reflected directly onto a predetermined area of the road surface 20 after it has been reflected once, which avoids the loss of light and greatly improves the light efficiency of the system.

5 and 6 are schematic side views along a plane view of the reflector module 13 on one side and a direction perpendicular to the road surface 20, respectively. In this embodiment, the inner wall 1311 of the curved reflector on one side of each of the reflector assemblies 131 has a continuous left and right asymmetric arcuate design along a direction perpendicular to the road surface 20, The LED light sources 121 located in the reflector assembly 131 are installed on one side of an arc that rests on the surface of the road so that light travels through a side of the arc that faces the surface of the road, It may be reflected within the determined area. The advantage of this design is that most of the light will be able to be irradiated to the road surface, thereby avoiding being irradiated to the roadside area. The road surface in this specification refers to a road surface of a road that needs to be irradiated by light, and a road surface refers to an area of two sides of a road that need not be generally inspected, such as a green belt area. In some embodiments, to simplify the manufacturing process, the inner wall 1311 of the curved reflector on one side of each reflector assembly 131 also has a symmetrical arcuate shape (e.g., . ≪ / RTI >

Referring to Fig. 7, there is shown a light distribution curve graph of the LED streetlamp 10 of the present invention used for a specific road surface. The inner wall 1311 of each reflector assembly 131 is designed as a left and right asymmetric arc and parabolic curved surface along directions parallel and perpendicular to the road surface 20 respectively as described above, The LED street lamp 10 of the present invention will be able to achieve a long distance survey towards two sides along a direction parallel to the road surface 20 (shown in Fig. 4) and two adjacent street lamps 10 Such a radiation distance may be set to be at least five times longer than the height of the lamp post, in order to ensure that there is no shadow between the light spots of the lamp. In addition, the LED street lamp 10 of the present invention may be irradiated parallel to the center of the road surface along a direction perpendicular to the road surface (shown in Fig. 6), thereby preventing the roadside area from being irradiated , And greatly improves the use of light. It can be seen from the light distribution curve of Figure 7 that the light is directed not only towards the long distance along the two sides of the lamp column but also towards the center of the road to significantly improve the light efficiency and meet the survey requirements of the road surface Can be confirmed. If a larger survey area is desired, modular reflector assemblies 131 are added correspondingly. Thereby, there is no problem in the illumination distance, the illumination uniformity, and the resilience of the light intensity adjustment, and the LED street light 10 of the present invention achieves greater improvements than that of ordinary street lights.

The positions set for the LED light sources 121 may also be fine tuned according to different light distribution requirements, for example, FIG. 8 shows a different embodiment from FIG. In the embodiment of Fig. 8, the LED light source 121 is mounted at the center position. The position of the LED light source 121 is generally fixed to the PCB board, which is generally fixed on the backboard 12. 9, the backboard 12 forms a sliding groove 123, and the LED light source 121 is mounted (or mounted) The PCB board 122 may be slidably mounted in the sliding groove 123 and may be slid to any position, for example, a, b, and c. Hence, on the one hand, the position of the LED light source 121 may be adjusted by adjusting the position of the PCB board 122 on the sliding groove 123; On the other hand, the PCB board 122 can be easily replaced, since the PCB board can often function erroneously, or the LED light source 121 with a different power to meet different light- Because it is necessary. In addition, the LED light source 121 of the present disclosure is not limited to an LED light source but also includes other types of light sources suitable for the reflector module of the present invention, whereby the term "LED light source" Especially to refer to the LED light source itself.

As shown in FIG. 10, a schematic diagram of an LED streetlight 10 according to another preferred embodiment of the present invention is shown. In contrast to the embodiment of FIG. 1, the embodiment of FIG. 10 omits the above design of the backboard 12, and the reflector module 13 is designed directly as a symmetrical structure back to it, 1 < / RTI > embodiment, and thus do not repeat here. The LED streetlight of the present embodiment may be applied to cases requiring only hanging, for example, the LED streetlight may be mounted on the upper end 15 of the tunnel through the mountain. In a non-limiting embodiment, the LED streetlight may be directly fixed onto the top portion 15 by the connection 14 without any lamp post, and may be used to provide power and corresponding control signals to the LED light sources The connection portion 14 may be used. In order to meet specific installation requirements, the LED street lamp 10 of the present invention may also have other corresponding structural changes, which are not individually described herein as examples.

Although the disclosure is shown and described in the exemplary embodiments, it is not intended to be limited to the details shown, since various modifications and substitutions can be made without departing from the spirit of the disclosure to be. Thus, it will be appreciated by those of ordinary skill in the art that additional variations and equivalents of the disclosure herein disclosed may be resorted to utilizing only routine experimentation, and that all such modifications and equivalents as may be claimed, And will be included within the spirit and scope of the disclosure.

Claims (10)

For an LED street light including LED light sources and a reflector assembly,
The reflector assembly includes a pair of curved reflectors arranged back-to-back symmetrically and each of the curved reflectors is parallel to the road surface to reflect light emitted from the LED light sources And is designed as a continuous parabolic curve along one direction so that the light is irradiated to a predetermined area along a direction parallel to the road surface after reflection. The method according to claim 1,
Each of the curved reflectors is designed as a continuous left and right asymmetric arc shape along a direction perpendicular to the road surface and is arranged in a predetermined region along a direction perpendicular to the road surface through an arc- Wherein the LED light sources located in each of the curved reflectors for reflecting light are mounted on one side of an arcuate shape backing the road surface. 3. The method according to claim 1 or 2,
Wherein the LED light sources are mounted on two sides of a backboard and the pair of curved reflectors are each arranged on two sides of the backboard. The method of claim 3,
Wherein the backboard forms a sliding groove, and the LED light sources are installed in the sliding groove by a PCB board movable in the sliding groove. 3. The method according to claim 1 or 2,
Wherein a curved shape of each of the curved reflectors is formed based on a plurality of contours calculated from a curve fitting algorithm. 3. The method according to claim 1 or 2,
Wherein the curved inner wall of the curved reflector is designed as a full mirror reflection. A LED street light including a backboard with LED light sources and a reflector module for light reflection,
Wherein the reflector assembly includes a plurality of reflector assemblies each of which includes a pair of curved reflectors symmetrically arranged back-to-back on two sides of the backboard, Each of the curved reflectors is designed as a continuous parabolic curved surface along a direction parallel to the road surface to reflect the light emitted from the LED light sources so that the light is reflected in advance along the direction parallel to the road surface after reflection LED streetlights, which are surveyed into determined areas. 8. The method of claim 7,
Each of the curved reflectors is designed as a continuous left and right asymmetric arc shape along a direction perpendicular to the road surface and is arranged in a predetermined region along a direction perpendicular to the road surface through an arc- Wherein an LED light source within each of said curved reflectors is mounted on one side of an arc shaped backing road surface to reflect light. 9. The method according to claim 7 or 8,
And the plurality of reflector assemblies are mounted side by side on the backboard. 9. The method according to claim 7 or 8,
Wherein one or more reflector assemblies are detachably mounted to the reflector module.

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