CN201531819U - led streetlight lens - Google Patents

Abstract

The utility model provides an LED streetlight lens. The lens is arranged above an LED light source, the axial lines of the lens and the light source are positioned on the same straight line, the lens comprises an incident plane, an emergent plane, a bottom plane, a full reflection plane and a transition plane of the full reflection plane and the emergent plane, wherein the incident plane is a long strip-shaped pit, the middle of the pit is a long strip-shaped curved surface which is formed by the vertical stretch of a circular arc line and a free curve which are symmetrical, and circular-arc surfaces or free curved surfaces are arranged at two end parts of the pit; the emergent plane is in the shape of a peanut which is concave like an arc along the X-axis direction and convex like the arc along the Y-axis direction, the profile of the emergent plane which penetrates the transverse cross section of a central axis of the lens is convex like a circular arc, and the central region of the profile of the emergent plane which penetrates the longitudinal cross section of the central axis of the lens is concave like the arc; and the full reflection plane surrounding the incident plane reflects light to the transition plane of the full reflection plane and the emergent plane. The use of the lens can lead light emitted by the LED light source to refract and output through the curved surfaces of the lens, thereby realizing high utilization rate.

Description

The LED street lamp lens

Technical field

The utility model relates to the LED lighting field, relates in particular to the higher LED street lamp lens of the efficiency of light energy utilization.

Background technology

Street lamp is the important component part of city illumination, and traditional street lamp often adopts high-pressure mercury lamp, and the high-pressure mercury lamp shortcoming that light efficiency is low has on the whole caused the huge waste of the energy.Therefore, development of new is efficient, energy-conservation, the life-span is long, colour rendering index is high, the street lamp of environmental protection has a crucial meaning to city illumination is energy-conservation.

Now, led light source as the application of street lamp more and more widely.Led light source is the light source that distribution of light is dispersed, and be to cooperate road lighting, need be on the basis of fully improving the efficiency of light energy utilization luminous intensity distribution again.

The LED street lamp mainly adopts two kinds of luminous intensity distribution forms in the market, and first kind for arching upward the LED light emitting module or recessed, and this luminous intensity distribution form can be distributed more widely in the road surface parallel direction with light, but the efficiency of light energy utilization is low, and uniformity does not reach requirement.Second kind is employing lens luminous intensity distribution, and lens material is PC or PMMA, the loss of the unreasonable and material of lens arrangement design itself, and the efficiency of light energy utilization is low.

Publication number is a kind of LED street lamp for the CN2842182 Chinese patent discloses, and the LED in this street lamp is that intensive being installed in laid on the plate, lays the plate middle part and is surface plate, and periphery forms angle to the installed surface perk in the other direction of LED, and the installed surface of whole LED is convex.

Publication number is that the Chinese patent of CN1821651 discloses a kind of high-power LED street lamp, and this road lamp cap is socketed with corresponding lens, and lens are fixed by securing cover plate.

Publication number is that the Chinese patent of CN2896006 discloses a kind of high-brightness LED street lamp lamp holder, is provided with arch support in the lamp holder, and great power LED is rack-mount, and each LED is equipped with lens.

Publication number is that the Chinese patent of CN1936417 discloses a kind of LED road-light light-source, the light-emitting device of this street lamp is that LED is installed on the bottom surface at the heat radiation seat of honour, the bottom surface is made of a plurality of clinoplains that form an angle each other, and the LED scioptics entangle, with lens fixed mount fixed lens.

Publication number is a kind of LED street lamp lens for the CN101105272 Chinese patent discloses, and the structure of this lens is to comprise to have the symmetrical pit of circle and the exit facet and the fully reflecting surface of pillow-like, and the material of lens is PC or PMMA.

Yet the very low or uniformity of the efficiency of light energy utilization of the street lamp lens that above patent documentation discloses does not reach standard.

The utility model content

The purpose of this utility model provides the high LED street lamp lens of a kind of light utilization efficiency, reaches the light distribution illumination requirement that satisfies road lighting in the rectangular area.

In order to reach above-mentioned purpose, a kind of LED street lamp lens is provided, described lens are installed in the top of led light source, the axis of described lens and light source is on same straight line, described lens comprise the transition face of the plane of incidence and exit facet, bottom surface, fully reflecting surface and fully reflecting surface and exit facet, the described plane of incidence is a strip pit that described led light source is installed, the middle part of pit is the circular arc line of symmetry, the strip curved surface of free curve stretched vertically, and its both ends are arc surface or free form surface; Exit facet is a peanut shape recessed along the X-direction arc, that the Y direction arc protrudes, the exit facet profile circular arc that passes the lateral cross section of lens centre axle protrudes, and the exit facet profile central area arc of longitudinal cross-section that passes the lens centre axle is recessed; Around the fully reflecting surface of the plane of incidence, with the transition face of light reflection to fully reflecting surface and exit facet.

Preferably, the line segment of the positive half section profile of described lateral cross section comprises that the incident facial contour comprises line segment AB, curve B C, and bottom profile is line segment CD, and the fully reflecting surface profile is curve D E, and the transition face profile is curve EF, and the exit facet profile is curve FG.

Preferably, the building method of FG curve is: AB and FG line constitute two-dimensional lens, revolve three-sixth turn by the Z axle, spent luminous energy in the α angle from 0 to redistribute at the radius perpendicular to the objective plane of led light source center line be in the r border circular areas light source sends, center line is through the center of border circular areas; The last point coordinates of FG be (x, z), light from light source point to (x, z) (x0 z0), thereby determines the drift angle that light source emits beam through the point on the FG, luminous flux in drift angle equals that circular area multiply by illumination in the corresponding objective plane, finally solves the numerical solution of FG curve according to the differential equation.

Preferably, the line segment of the positive half section profile of described longitudinal cross-section comprises that the incident facial contour comprises line segment ab, and bottom profile is line segment bc, and the fully reflecting surface profile is curve cd, and the transition face profile is curve de, and the exit facet profile is curve ef.

Preferably, the building method of ef curve is: ab and ef line constitute two-dimensional lens, revolve three-sixth turn by the Z axle, spent luminous energy in the β angle from 0 to redistribute at the radius perpendicular to the objective plane of led light source center line be in the r border circular areas light source sends, center line is through the center of border circular areas; Suppose that light source is a spot light, the last point coordinates of ef is (y, z), light from light source point to (y, z) be incident ray, from (y is an emergent ray to objective plane z), luminous flux in drift angle equals that circular area multiply by illumination in the corresponding objective plane, finally solves the numerical solution of ef curve according to the differential equation; Wherein ab is the free curve that is adjusted according to the actual luminous intensity distribution of LED.

Preferably, the light path that light source sent comprises low-angle light path and wide-angle light path, refraction arrives exit facet to described low-angle light path through the plane of incidence in order to send from light source, and then through superrefraction, from the exit facet outgoing, all light that form rectangular light spot in the vertical level of certain distance are formed, described low-angle light path at the angle of the vertical line of described the above lens of lateral cross section within 80 degree, described low-angle light path on the described fore-and-aft plane with the angle of described vertical line within 80 degree; Refraction arrives peripheral fully reflecting surface to described wide-angle light path through the plane of incidence in order to send from light source, arrive transition face through the reflection back, and then through superrefraction from the lens outgoing, light concentrates within the above-mentioned rectangular light spot, thereby the light of central area is further strengthened compensation.

Preferably, the material of described lens is polymethyl methacrylate, Merlon or glass.

Preferably, described lens be single installation or a plurality of array with the luminescent panel of LED correspondence on.

Use lens of the present utility model, the luminous energy that led light source sent can both transfer out through the refraction of lens curved surface, so utilization rate is higher.The unique design of the outgoing curved surface of lens of the present utility model can well distribute luminous energy on shadow surface, so the uniformity is higher.

Description of drawings

Reference is the description and the accompanying drawing of current preferred embodiment hereinafter, can understand the utility model and purpose and advantage best, wherein:

Fig. 1 is system's cutaway view of the utility model street lamp lens cooperated with LED;

Fig. 2 is that the utility model street lamp lens cooperates analysing and observe of two LEDs systems; Figure

Fig. 3 is the upper surface stereogram of the utility model lens;

Fig. 4 is the lower surface stereogram of the utility model lens;

Fig. 5 is the two-dimensional coordinate signature of the utility model lens lateral cross section;

Fig. 6 is the two-dimensional coordinate signature of the utility model lens longitudinal cross-section;

Fig. 7 is the utility model lens arra installation diagram;

Fig. 8 is the light propagation figure of the utility model street lamp lens cooperated with LED system;

Fig. 9 is the actual installation Illumination Distribution figure that implements the utility model street lamp lens optical system;

Figure 10 is the actual installation distribution curve flux figure that implements the utility model street lamp lens optical system.

The reference numeral table:

11～lens, 111～lens plane of incidence

112～lens exit facet, 113～lens fully reflecting surface

Transition face 115～lens bottom surface of 114～lens fully reflecting surface and exit facet

12～led light source, 3～target area

The light that 121～light source sent is divided into the low-angle light path

The light that 122～light source sent is divided into the wide-angle light path

The specific embodiment

Description is described the preferred embodiment according to LED street lamp lens of the present utility model.

As shown in Figure 1, according to the utility model embodiment LED street lamp application in general LED road lamp optical system 1.Optical system 1 comprises led light source 12.Led light source 12 is installed on lens 11 bottom surfaces.

In the present embodiment, led light source 12 is single or multiple great power LEDs or LED module.Led light source 12 sends the light that angle is 180 degree substantially.It is the cutaway view that the utility model street lamp lens cooperates two LEDs systems that Fig. 2 shows.

Lens 11 through shaping again, form the lens of rectangular light spot with led light source 13 emitted lights in the vertical plane of certain distance.The structure of lens 11 now is described in detail in detail.

Shown in Fig. 3 and 4, lens 11 comprise transition face 114, the bottom surface 115 of the plane of incidence 111 and exit facet 112, fully reflecting surface 113 and fully reflecting surface and exit facet.The plane of incidence 111 is the strip pit, and the middle part of pit is the circular arc line of symmetry, the strip curved surface of free curve stretched vertically, and its both ends are arc surface or free form surface.Exit facet 112 is a peanut shape that recessed, the horizontal arc of vertical arc protrudes.Around the fully reflecting surface 113 of the plane of incidence, with the transition face 114 of light reflection to fully reflecting surface and exit facet.

As illustrated in Figures 5 and 6, the plane of incidence 111 of lens 11 forms in the following manner with exit facet 112:

Definition lens centre axle is the Z axle, overlap with the primary optical axis direction of illuminator, the lateral cross section of passing the lens centre axle is the X-Z plane, and its exit facet profile circular arc protrudes, the longitudinal cross-section of passing the lens centre axle is the Y-Z plane, and its exit facet profile central area arc is recessed.

The line segment of the positive half section profile on the lens X-Z plane is represented: plane of incidence profile is line segment AB, and the transition face profile is curve B C, bottom profile line CD, and fully reflecting surface outline line DE, transition face outline line EF, exit facet profile are curve FG.

The building method of CD curve is:

AB and FG line constitute two-dimensional lens, revolve three-sixth turn by the Z axle, assume three-dimensional circle symmetric lens, to spend the radius that the luminous energy in the α angle redistributes at objective plane from 0 be in the r border circular areas with light source sent, supposes that light source is a spot light, and the last point coordinates of FG is (x, z), according to the light refraction law, determine light from light source point to (x is z) through the point (x0 on the FG, c), thereby determine the drift angle that light source emits beam, (x0 z0) tries to achieve by following formula point

$\mathrm{\Γ}=\sqrt{n^{\′2}-n^2+{(\stackrel{V}{A}\·{\stackrel{V}{N}}_0)}^2}-\stackrel{V}{A}\·{\stackrel{V}{N}}_0$ (0.1)

${\stackrel{V}{A}}^{\&prime;}=\stackrel{V}{A}+\mathrm{\&Gamma;}{\stackrel{V}{\mathrm{<figure-callout\; id="0"\; label="N\; V"\; filenames="DEST\_PATH\_HSB00000044065300011.png,DEST\_PATH\_HSB00000044065300012.png"\; state="\{\{state\}\}">N</figure-callout>}}}_0$

This moment the emergent ray vector: ${\stackrel{v}{A}}^{\&prime;}=(x-x0,z-z0)$

The incident ray vector: $\stackrel{v}{A}=(x0,z0)$

N is an atmospheric density

N ' is a lens density

(x0 arrives z0) that (x z) is mapped to the target area through reflecting, and equally according to the law of refraction (1.1), thereby tries to achieve in the radius r that arrives the target border circular areas to light by point then;

This moment the emergent ray vector: ${\stackrel{v}{A}}^{\&prime;}=(r-x,H-z)$

The incident ray vector: $\stackrel{v}{A}=(x-x0,z-z0)$

N is a lens density

N ' is an atmospheric density

Again according to luminous energy through the conservation of energy formula of lens, the luminous flux in drift angle equals that circular area multiply by illumination in the corresponding objective plane.Luminous flux in drift angle 2 θ is $\mathrm{\&Phi;}1={\&Integral;}_{-\mathrm{\&theta;}}^{\mathrm{\&theta;}}I\left(\mathrm{\&theta;}\right)\mathrm{d\&Omega;}$ At the radius of objective plane is that luminous flux in the r border circular areas is Φ 2=E* π r ²Thereby by boundary condition x=0, z=a and conservation of energy formula Φ 1=Φ 2 can determine finally that (x, z) numerical solution finally fit to the FG free curve to coordinate points.

The line segment of the positive half section profile on the lens Y-Z plane is represented: plane of incidence profile comprises line segment ab, and bottom profile is line segment bc, and the fully reflecting surface profile is curve cd, and the transition face profile is curve de, and the exit facet profile is curve ef.

The building method of ef curve is:

Ab and ef line constitute two-dimensional lens, revolve three-sixth turn by the Z axle, assume three-dimensional circle symmetric lens, to spend the radius that the luminous energy in the β angle redistributes at objective plane from 0 be in the r border circular areas with light source sent, suppose that light source is a spot light, the last point coordinates of ef is (y, z), according to the light refraction law, light from light source point to (y, z) be incident ray, from (y is an emergent ray to objective plane z), according to conservation of energy formula in the luminous energy process lens process, luminous flux in the light source drift angle equals that circular area multiply by illumination in the corresponding objective plane, according to boundary condition y=0, z=OG, and the differential equation that satisfies above-mentioned formula, try to achieve the numerical solution of ef curve, finally fit into the ef free curve.

In like manner can in the hope of through Y-axis, with Z axle clamp angle be curve e1f1 on the plane P 1 of a1, a1＞1 degree, the boundary condition of this moment is y=0, z=OG1, G1 are the intersection point of face P1 and CG.The e2f2 of a2 angle correspondence, a2＞a1.If CG is divided into equal angles N section curve (N＞3), then can try to achieve N+1 bar curve altogether.

The exit facet 112 of lens is the curved surfaces of formatting and forming by above grid in length and breadth of trying to achieve.

Circular arc line or the free curve of ab for being adjusted according to the actual luminous intensity distribution of LED, the curved surface of ab stretched vertically finally form the pit mid portion of the plane of incidence 111 through left-right symmetry.

In the present embodiment, the material of lens 11 is polymethyl methacrylate (PMMA), Merlon (PC) or glass.

In the present embodiment, be single installation according to LED street lamp lens of the present utility model.Certainly, but also array formation module installation of lens of the present utility model, as shown in Figure 7.

As shown in Figure 8, the light that the utility model is sent from led light source 12 is divided into low-angle light path 121 and wide-angle light path 122, light path 121 is to send the plane of incidence 111 of back directive lens 11 from led light source 12, again by the exit facet 112 of the plane of incidence 111 directive lens, at last by reflecting the target areas that arrive in the vertical level of certain distance through exit facet 112, all light that form rectangular light spot in the target area are formed, the low-angle light path on the X-Z plane with the angle of Z axle within 80 degree, the low-angle light path on the Y-Z plane with the angle of Z axle within 80 degree.Light path 122 is to be sent the fully reflecting surface 113 of back directive lens 11 by led light source 12, pass through the transitional region 114 of fully reflecting surface 113 reflection directive fully reflecting surfaces 113 and exit facet 112 again, arrive target area 3 through refraction at last, light concentrates within the above-mentioned rectangular light spot, thereby the light of central area is further strengthened compensation.

By above optic path principle as can be seen, the luminous energy that led light source sent can both transfer out through the refraction of lens curved surface, and the design of scioptics outgoing curved surface can well distribute luminous energy on shadow surface in addition, reaches the illuminance uniformity requirement.

Fig. 9, Figure 10 are the design sketch that the LED street lamp after enforcement the utility model scheme reaches, and are respectively Illumination Distribution figure and distribution curve flux figure.As can be seen in the effective lighting scope, the even performance of illuminance reaches road illumination standards by these two optical effect figure.

The utlity model has following advantage.

(1) use lens of the present utility model, the luminous energy that led light source sent can both transfer out through the refraction of lens curved surface, so utilization rate is higher.

(2) unique design of the outgoing curved surface of lens of the present utility model can well distribute luminous energy on shadow surface, so the uniformity is higher.

Although described example embodiment of the present utility model already, those skilled in the art should understand and can modify and do not exceed purport of the present utility model and spirit these embodiment, and scope of the present utility model is limited by claims and equivalent thereof.

Claims (8)

1. LED street lamp lens, described lens are installed in the top of led light source, the axis of described lens and light source is on same straight line, described lens comprise the transition face of the plane of incidence and exit facet, bottom surface, fully reflecting surface and fully reflecting surface and exit facet, it is characterized in that: the described plane of incidence is a strip pit that described led light source is installed, the middle part of pit is the circular arc line of symmetry, the strip curved surface of free curve stretched vertically, and its both ends are arc surface or free form surface; Exit facet is the shape that, a Y direction arc recessed along the X-direction arc protrudes, and the exit facet profile circular arc that passes the lateral cross section of lens centre axle protrudes, and the exit facet profile central area arc of longitudinal cross-section that passes the lens centre axle is recessed; Around the fully reflecting surface of the plane of incidence, with the transition face of light reflection to fully reflecting surface and exit facet.

2. street lamp lens as claimed in claim 1, it is characterized in that, the line segment of the positive half section profile of described lateral cross section comprises that the incident facial contour comprises line segment AB, curve B C, bottom profile is line segment CD, the fully reflecting surface profile is curve D E, the transition face profile is curve EF, and the exit facet profile is curve FG.

3. street lamp lens as claimed in claim 2, it is characterized in that, the FG curve constitutes two-dimensional lens by AB and FG line, revolve three-sixth turn by the Z axle, spent luminous energy in the α angle from 0 to redistribute at the radius perpendicular to the objective plane of led light source center line be in the r border circular areas light source sends, center line is through the center of border circular areas; The last point coordinates of FG is (x, z), light from light source point to (x, z) through the point (x0 on the FG, z0), thereby determine the drift angle that light source emits beam, the luminous flux in drift angle equals that circular area multiply by illumination in the corresponding objective plane, and finally the numerical solution that solves the FG curve according to the differential equation defines.

4. street lamp lens as claimed in claim 1 is characterized in that, the line segment of the positive half section profile of described longitudinal cross-section comprises that the incident facial contour comprises line segment ab, bottom profile is line segment bc, the fully reflecting surface profile is curve cd, and the transition face profile is curve de, and the exit facet profile is curve ef.

5. street lamp lens as claimed in claim 4, it is characterized in that, the ef curve constitutes two-dimensional lens by ab and ef line, revolve three-sixth turn by the Z axle, spent luminous energy in the β angle from 0 to redistribute at the radius perpendicular to the objective plane of led light source center line be in the r border circular areas light source sends, center line is through the center of border circular areas; Suppose that light source is a spot light, the last point coordinates of ef is (y, z), light from light source point to (y, z) be incident ray, from (y is an emergent ray to objective plane z), luminous flux in drift angle equals that circular area multiply by illumination in the corresponding objective plane, finally solves the numerical solution of ef curve according to the differential equation; Wherein ab defines for the free curve that is adjusted according to the actual luminous intensity distribution of LED.

6. street lamp lens as claimed in claim 1, it is characterized in that: the light path that light source sent comprises low-angle light path and wide-angle light path, refraction arrives exit facet to described low-angle light path through the plane of incidence in order to send from light source, and then through superrefraction, from the exit facet outgoing, all light that form rectangular light spot in the vertical level of certain distance are formed, described low-angle light path at the angle of the vertical line of described the above lens of lateral cross section within 80 degree, described low-angle light path on the described fore-and-aft plane with the angle of described vertical line within 80 degree; Refraction arrives peripheral fully reflecting surface to described wide-angle light path through the plane of incidence in order to send from light source, arrives transition face through the reflection back, and then through the light path of superrefraction from the lens outgoing.

7. street lamp lens as claimed in claim 1 is characterized in that, the material of described lens is polymethyl methacrylate, Merlon or glass.

8. street lamp lens as claimed in claim 1 is characterized in that, described lens be single installation or a plurality of array with the luminescent panel of LED correspondence on.

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