CN102072460B - Lens for increasing spacing height ratio and improving illumination uniformity of light emitting diode (LED) lamp - Google Patents

Abstract

Translated fromChinese

提高LED灯具距高比和照度均匀性的透镜，所述透镜由七个通光面组成，第一、第三、第六折射面形成透镜入射面，第二、第五、第七折射面形成透镜出射面，经第二、第五折射面出来的是平行光线，负责远场小角度照明，经第七折射面出来的是非平行光线，照顾近场大角度照明。本发明透镜能够实现兼顾远场和近场照明并能达到很高的照度均匀性，使灯具在很大的距高比下使用从而不产生眩光的照明效果。

A lens for improving the pitch-to-height ratio and illuminance uniformity of LED lamps. The lens is composed of seven light-transmitting surfaces, the first, third, and sixth refraction surfaces form the lens incident surface, and the second, fifth, and seventh refraction surfaces form the lens incident surface. On the exit surface of the lens, parallel rays come out through the second and fifth refraction surfaces, responsible for far-field small-angle illumination, and non-parallel rays come out through the seventh refraction surface, taking care of near-field large-angle illumination. The lens of the present invention can achieve both far-field and near-field illumination and can achieve high uniformity of illuminance, so that the lamp can be used under a large distance-to-height ratio without generating glare lighting effects.

Description

Improve the lens of LED light fixture apart from height ratio and illuminance uniformity

Technical field

The present invention relates to a kind of optical element, in particular, relate to the lens of a kind of LED of raising light fixture apart from height ratio and illuminance uniformity.

Background technology

In some LED illumination application, be an important parameter weighing illuminating effect apart from height ratio and illuminance uniformity.Be meant that apart from height ratio distance and light fixture between the light fixture is from the ratio of the distance of face to be illuminated; Such as application scenario in road lighting; Is vertical apart from height ratio along distance between adjacent two light fixtures of road direction and light fixture from the ratio of the distance on road surface, and the distance and the light fixture that are installed between two light fixtures on both sides of the road are horizontal apart from height ratio from the ratio of the distance on road surface.In low level illumination, the pole height of LED light fixture promptly is installed when relatively lower, not only required irradiation distance distant but also require illuminance uniformity than higher occasion, such as, very wide road lighting, present LED light fixture just is difficult to reach requirement.Because at present the LED light fixture is horizontal all lower apart from height ratio, generally have only 3: 1 or lower, the LED lamp installation mode of this high lamp stand not only can produce serious glare to driver's eyes, causes very big potential safety hazard, and causes the lamp stand cost higher.Also have some other application scenario,, also belong to low level illumination such as wall lamp, therefore than needs big apart from height ratio and high illuminance uniformity.

Summary of the invention

The present invention is directed to the technical problem that exists in the prior art; The lens of a kind of LED of raising light fixture apart from height ratio and illuminance uniformity are provided; The LED light fixture of these lens is installed, can be realized taking into account the illumination of far field and near field and can reach the effect of very high illuminance uniformity, make light fixture very big apart from height ratio use and do not produce dazzle down; Light utilization is very high, is applicable to various types of led light sources.

For solving the problems of the technologies described above, the technical scheme that the present invention adopts is following:

Improve the lens of LED light fixture apart from height ratio and illuminance uniformity; Comprise a lens installation bottom surface, on said lens installation bottom surface, be provided with confession LED and be installed on the pit in it that inner surface of this pit constitutes the plane of incidence of lens; Also comprise the outer surface that forms the beam projecting face; Said lens are made up of seven logical light faces, and wherein the two ends of first plane of refraction connect third reflect face and the 6th plane of refraction respectively, and the inner surface of the first, the 3rd, the 6th plane of refraction constitutes the plane of incidence of lens jointly; The two ends of second plane of refraction connect the 5th plane of refraction and the 7th plane of refraction respectively, and the outer surface of the second, the 5th, the 7th plane of refraction constitutes the exit facet of lens jointly; Wherein the whole emergent raies on first plane of refraction only reflect through second plane of refraction; Whole emergent raies on the third reflect face are earlier through the reflection of the 4th fully reflecting surface; All reflection ray reflects through the 5th plane of refraction again; What warp second plane of refraction and the 5th plane of refraction reflected is parallel rays, and the whole emergent raies on the 6th plane of refraction reflect non-parallel light through the 7th planes of refraction, and an end of the 4th fully reflecting surface is connected with the 5th plane of refraction; Three, the other end of the 6th, the 7th plane of refraction and the 4th fully reflecting surface all is positioned at lens and installs on the bottom surface, and it is that a cross section Rotate 180 degree by lens forms that said lens are installed the bottom surface.

The position of the tie point of said first plane of refraction and third reflect face is close to another end points of first plane of refraction than other points on this third reflect face.

The reflection ray of the tie point of said process third reflect face and the 4th fully reflecting surface is through the tie point of second plane of refraction and the 5th plane of refraction, and the angle >=2arcsin between this incident ray and the reflection ray (1/n), and wherein n is the refractive index of lens.

Said first plane of refraction, second plane of refraction, third reflect face, the 4th fully reflecting surface, the 5th plane of refraction, the 6th plane of refraction and the 7th plane of refraction are respectively level and smooth curve.

It is the transparent material between 1.3～4.2 that said lens adopt refractive index.

The technical scheme that the present invention adopted, the multiaspect design of scioptics, rays pass through lens second and the 5th plane of refraction that led light source sends are refracted as parallel rays; Realize far field low-angle luminous intensity distribution; From the light that lens the 7th plane of refraction reflects, realize near field wide-angle luminous intensity distribution, make the LED light fixture that adopts these lens when setting height(from bottom) is very low; Shine very wide scope and illuminance uniformity and can reach very high; Thereby improve greatly the LED lighting apart from height ratio, accomplish to see that light loses lamp, thoroughly the illuminating effect of free from glare.In actual the use, when the LED light fixture is installed, usually lens or LED light fixture are carried out low-angle inclination.This is owing to receive the size of led light source; The influence of factors such as lens sizes and lens processing technology; The light that the second and the 5th plane of refraction of scioptics reflects can not keep strict parallel rays, but has dispersing of certain angle, and lens are done inclination slightly; Can make and deviate from that part of irradiate light that face to be illuminated exhales, improve the light utilization of light source to face to be illuminated.Withdrawing pattern is convenient in process of production in order to make lens, and the position of the tie point of lens first plane of refraction and third reflect face is close to another end points of first plane of refraction than other points on this third reflect face.

Adopt the LED light fixture of lens of the present invention, can make in actual use to reach more than 6: 1, and illuminance uniformity can reach 0.8 apart from height ratio.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:

Fig. 1 is the lens arrangement sketch map of the embodiment of the invention;

Fig. 2 is the sectional view of Fig. 1 lens;

Fig. 3 is the installation bottom surface structure chart of Fig. 1 lens;

Fig. 4 is that the light on the cross section shown in Figure 2 moves towards figure;

Fig. 5 is the LED light fixture radiation response figure that uses lens of the present invention.

The specific embodiment

Fig. 1～shown in Figure 4; The disclosed raising of the present invention LED light fixture is made up of seven logical light faces apart from the lens of height ratio and illuminance uniformity, and wherein the two ends of first plane ofrefraction 1 connect third reflectface 3 and the 6th plane ofrefraction 6 respectively; On the sectional view as shown in Figure 2, its tie point is respectively e and a.The inner surface of first plane ofrefraction 1, third reflectface 3, the 6th plane ofrefraction 6 constitutes the plane of incidence of lens jointly; The other end of third reflectface 3 and the 6th plane ofrefraction 6 all is positioned at lens and installs on thebottom surface 10; On the sectional view as shown in Figure 2, this end points is respectively shown in c and the h.The two ends of second plane ofrefraction 2 connect the 5th plane ofrefraction 5 and the 7th plane ofrefraction 7 respectively, and on the sectional view as shown in Figure 2, its tie point is respectively f and b.The outer surface of second plane ofrefraction 2, the 5th plane ofrefraction 5, the 7th plane ofrefraction 7 constitutes the exit facet of lens jointly.One end of the 4th fully reflectingsurface 4 is connected with the 5th plane ofrefraction 5, and the other end is positioned to be installed on thebottom surface 10, respectively g point and the d point on the cross section as shown in Figure 2.The other end of the 7th plane ofrefraction 7 is positioned at installs on thebottom surface 10 the j point on the cross section as shown in Figure 2.

Move towards among the figure at light shown in Figure 4; Whole emergent raies on first plane ofrefraction 1 only reflect through second plane ofrefraction 2; Whole emergent raies on the third reflectface 3 are earlier through 4 reflections of the 4th fully reflecting surface; All reflection rays reflect through the 5th plane ofrefraction 5 again, and the light that reflects from second plane ofrefraction 2 and the 5th plane ofrefraction 5 is parallel rays.Be positioned at the point of installing on thebottom surface 10 on the 4th fully reflectingsurface 4; D point as shown in Figure 4; Its reflection ray is through the tie point f of second plane ofrefraction 2 and the 5th plane ofrefraction 5; And incident ray cd and the angle between the reflection ray df at a d satisfy α >=2arcsin (1/n) (wherein n is the refractive index of lens), so that all incident raies on the 4th fully reflectingsurface 4 all reflect to the 5th plane ofrefraction 5.

In order to make lens withdrawing pattern in batch production process more convenient; The link of the lens third reflectface 3 of the present invention and first plane ofrefraction 1, the joining e on the cross section as shown in Figure 2 more are close to another end points a of first plane of refraction than other points on this third reflectface 3.

With the cross section Rotate 180 degree of lens shown in Figure 2, form the three-dimensional shape of lens of the present invention as shown in Figure 1, and this cross section forms theinstallation bottom surface 10 of lens as shown in Figure 3 after rotating.

Installing at lens shown in Figure 3 has the led light source of confession to be installed on thepit 11 in it on thebottom surface 10, the inner surface of thispit 11 is made up of the inner surface of first plane ofrefraction 1, third reflectface 3, the 6th plane ofrefraction 6, and forms the plane of incidence of lens jointly.

When reality is used, lens are done low-angle inclination, the LED light fixture that these lens perhaps will be installed is done low-angle inclination; Purpose is that emergent ray is as far as possible all shone to the road surface; This is owing to the size that receives led light source, the influence of factors such as lens sizes and lens processing technology, and the light that second plane ofrefraction 2 of scioptics and the 5th plane ofrefraction 5 reflect can not keep strict parallel rays; But have dispersing of certain angle; And lens are done inclination slightly, and can make and deviate from that part of irradiate light that the road surface exhales to the road surface, improve the light utilization of light source.And can do suitable adjustment to satisfy instructions for use to this angle of inclination according to the scope on actual road surface.

Above-mentioned first plane ofrefraction 1, second plane ofrefraction 2, third reflectface 3, the 4th fully reflectingsurface 4, the 5th plane ofrefraction 5, the 6th plane ofrefraction 6 and the 7th plane ofrefraction 7 are level and smooth curve.

Shown in Figure 5 the setting height(from bottom) that theLED light fixture 20 of lens of the present invention is installed among the figure is H in order to use the LED light fixture radiation response figure of lens of the present invention, and the face to be illuminated width is L, and the area to be illuminated territory is 100.

Table one is depicted as road bilateral cloth lamp; The setting height(from bottom) of LED light fixture is 0.9 meter, the brightness value when shine width of roadway and be respectively 9.5 meters, 10.5 meters, 15 meters and 16 meters, from table it is thus clear that; Is 5.3: 1 o'clock in the horizontal of LED light fixture apart from height ratio; Uniformity of illuminance reaches more than 0.8, is 8.9: 1 o'clock in the horizontal of LED light fixture apart from height ratio, and uniformity of illuminance reaches more than 0.5.

Table one

Shown in Figure 5, the setting height(from bottom) ofLED light fixture 20 is H, and the face to be illuminated width is L, and the area to be illuminated territory is illustrated 100.Can find out intuitively that from figure H is very little and L is very big, promptly the LED light fixture is very big apart from height ratio.

Claims (5)

1. improve the lens of LED light fixture apart from height ratio and illuminance uniformity; Comprise a lens installation bottom surface; On said lens installation bottom surface, being provided with supplies LED to be installed on the pit in it; The inner surface of this pit constitutes the plane of incidence of lens, also comprises the outer surface that forms the beam projecting face, and it is characterized in that: said lens are made up of seven logical light faces; Wherein the two ends of first plane of refraction connect third reflect face and the 6th plane of refraction respectively, and the inner surface of the first, the 3rd, the 6th plane of refraction constitutes the plane of incidence of lens jointly; The two ends of second plane of refraction connect the 5th plane of refraction and the 7th plane of refraction respectively, and the outer surface of the second, the 5th, the 7th plane of refraction constitutes the exit facet of lens jointly; Wherein the whole emergent raies on first plane of refraction only reflect through second plane of refraction; Whole emergent raies on the third reflect face are earlier through the reflection of the 4th fully reflecting surface; All reflection ray reflects through the 5th plane of refraction again; What warp second plane of refraction and the 5th plane of refraction reflected is parallel rays, and the whole emergent raies on the 6th plane of refraction reflect non-parallel light through the 7th planes of refraction, and an end of the 4th fully reflecting surface is connected with the 5th plane of refraction; Three, the other end of the 6th, the 7th plane of refraction and the 4th fully reflecting surface all is positioned at lens and installs on the bottom surface, and it is that a cross section Rotate 180 degree by lens forms that said lens are installed the bottom surface.

2. raising LED light fixture according to claim 1 is apart from the lens of height ratio and illuminance uniformity, and it is characterized in that: the position of the tie point of said first plane of refraction and third reflect face is close to another end points of first plane of refraction than other points on this third reflect face.

3. raising LED light fixture according to claim 1 is apart from the lens of height ratio and illuminance uniformity; It is characterized in that: at lens the angle >=2arcsin (l/n) between bottom surface place's incident ray and the reflection ray is being installed on said the 4th fully reflecting surface, wherein n is the refractive index of lens.

4. raising LED light fixture according to claim 1 is apart from the lens of height ratio and illuminance uniformity, and it is characterized in that: said first plane of refraction, second plane of refraction, third reflect face, the 4th fully reflecting surface, the 5th plane of refraction, the 6th plane of refraction and the 7th plane of refraction are respectively level and smooth curve.

5. raising LED light fixture according to claim 1 is apart from the lens of height ratio and illuminance uniformity, and it is characterized in that: it is the transparent material between 1.3～4.2 that said lens adopt refractive index.

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