CN203731286U - Led lens - Google Patents

Abstract

The utility model relates to the field of LED products, and discloses an LED lens which comprises a lens body, a lens outer surface curved surface located at the front end of the lens body, a lens lateral surface curved surface located on the side face of the lens body, and a lens inner groove located at the rear portion of the lens body. The lens outer surface curved surface is a curved surface which enables light rays to be upward refracted, and the lens lateral surface curved surface is a total-reflection surface. Light distribution can be completed without obliquely placing a lamp with the LED lens, the LED lens has a high light ray utilization rate, is small in occupied space and size, compact in structure, easy to manufacture and even in light spot, and can be applied to the field of LED floodlight illumination, wall washer illumination and the like.

Description

LED lens

Technical field

The utility model relates to LED product scope, especially a kind of LED lens.

Background technology

At present, in the light fixtures such as LED floodlight, wall lamp, luminous intensity distribution is divided into two kinds substantially, a kind ofly by reflector, carries out luminous intensity distribution, and another kind of scioptics carry out luminous intensity distribution, both need light fixture slant setting.For making target face top light intensity reach requirement, tilted-putted light distributing method tends to cause light beam top light to exceed target face, larger to the waste of light.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of LED lens with high light line use ratio.

The disclosed LED lens of the utility model comprise mirror body, are positioned at the lens outer surface curved surface of mirror body front end, the lens inside groove that is positioned at the lens side surface curved surface of mirror body side surface and is positioned at mirror body rear portion, described lens outer surface curved surface is to make the upwards curved surface of refraction of light, and described lens side surface curved surface is fully reflecting surface.

Preferably, the light that described lens outer surface curved surface upwards reflects and the angle of horizontal plane are 18 degree.

Preferably, described lens inside groove is a cup-shaped hole, and lens inside groove comprises the inside groove plane of incidence and inside groove side.

Preferably, the described inside groove plane of incidence is plane.

Preferably, the described inside groove plane of incidence is quadratic surface, and inside groove plane of incidence equation is wherein, radius radius r meets: 0≤r≤10mm, curved surface coefficient k meets: ﹣ ∞≤k≤﹣ 1.

Preferably, inside groove side outer edge length is greater than inside groove side inner edge length, and the angle of described inside groove side and optical axis is greater than 1 degree.

Preferably, described lens side surface curved surface comprises upper curved surface and lower curved face, and the distance between lens inside groove and upper curved surface is greater than the distance of lens inside groove and lower curved face.

The beneficial effects of the utility model are: use the light fixture of these LED lens can complete luminous intensity distribution without slant setting, and there is higher light utilization, it takies that volume is little, compact conformation, making are simple, and hot spot is even, can be applicable to the lighting fields such as LED floodlight, wall lamp.

Accompanying drawing explanation

Fig. 1 is schematic diagram of the present utility model;

Fig. 2 is the schematic diagram of realizing lens outer surface curved surface characteristic in the utility model;

Fig. 3 is schematic perspective view of the present utility model;

Fig. 4 is the opticpath figure of 0 °-180 ° in the utility model;

Fig. 5 is the opticpath figure of 90 °-270 ° in the utility model;

Fig. 6 is the distribution curve flux polar diagram of an embodiment in the utility model;

Fig. 7 is the schematic diagram of inside groove side and optical axis included angle in the utility model.

Mark in figure: 1-lens outer surface curved surface, 2-lens side surface curved surface, 201-upper curved surface, 202-lower curved face, 3-lens inside groove, the 301-inside groove plane of incidence, 302-inside groove side, 303-inside groove side outer edge, 304-inside groove side inner edge, 4-LED light source, 5-target face, 6-mirror body, 7-optical axis, 8-angle.

In Fig. 6, dashed curve represents the section distribution curve flux of 0 °～180 °, and block curve represents the section distribution curve flux of 90 °-270 °.

The specific embodiment

Below in conjunction with drawings and Examples, the utility model is further illustrated.

As shown in Figure 1, the disclosed LED lens of the utility model, comprise mirror body 6, be positioned at mirror body 6 front ends lens outer surface curved surface 1, be positioned at the lens side surface curved surface 2 of mirror body 6 sides and the lens inside groove 3 that is positioned at mirror body 6 rear portions, described lens outer surface curved surface 1 is for making the upwards curved surface of refraction of light, and described lens side surface curved surface 2 is fully reflecting surface.

Wherein, lens inside groove 3 is for laying LED light source 4, the light that LED light source 4 sends enters the mirror body 6 of lens through lens inside groove 3, wherein the direct scioptics outer surface of a part of light curved surface 1 reflects, another part light is through 2 total reflections of lens side surfaces curved surface, and then scioptics outer surface curved surface 1 reflects, and lens outer surface curved surface 1 characteristic is by upwards refraction of refracted ray, so, used the light fixture of these LED lens can reach light distribution effect by slant setting.

Described lens side surface curved surface 2 refers to for fully reflecting surface: lens side surface curved surface 2 can total reflection be placed in the light that in lens inside groove 3, LED light source 4 is launched." described lens outer surface curved surface 1 is for making the upwards curved surface of refraction of light " above, the incident ray source of its refracted ray is the light that LED light source 4 scioptics mirror bodies 6 arrive lens outer surface curved surface 1, but the light that is not all arrival lens outer surface curved surfaces 1 is all upwards reflected, the light that only need have an arrival lens outer surface curved surface 1 of 95% can be reached designing requirement by refraction upwards.As shown in Figure 2, the light here upwards refraction also not refers to refracted ray straight up, but refracted ray can become with horizontal plane certain acute angle angle.As shown in Figure 2, the method for optimizing of realizing said lens outer surface curved surface 1 above-mentioned characteristic is:

First light LED light source 4 being sent carries out discrete, secondly determines target face 5, and target face 5 is carried out to grid division, sets the initial point on lens outer surface curved surface 1 simultaneously, then the initial point on target face 5 and lens outer surface curved surface 1 is mapped.After target face 5 is determined, can obtain target face 5 to the vector of lens outer surface curved surface 1, it is refracted ray, the light that LED light source 4 is sent carry out discrete after, obtain incident ray, according to Snell's law, can obtain the normal vector of lens outer surface curved surface 1 initial point, determine this tangental equation simultaneously.When grid division is enough thin, next point, be that the tangent plane unit that the incident ray of second point must be selected with this intersects, and then definite second point, after second point is determined, according to its corresponding impact point, can determine incident vector refraction vector, then obtain the normal vector that second point is corresponding, pass through iterative method, determine successively each point on lens outer surface curved surface 1, then each point on lens outer surface curved surface 1 is coupled together, form a smooth curved surface, Here it is the required lens outer surface curved surface of the utility model.

Fig. 4 is opticpath figure and distribution curve flux polar diagram in a preferred embodiment in the utility model to Fig. 6, from figure, in the section distribution curve flux of 0 °～180 °, can find out, after 20 °, increase along with angle, luminous intensity weakens rapidly, so, while using this LED lens, as long as regulate suitably, in can guaranteeing to use, target face top light intensity is higher, can make again light beam middle and upper part less over the light of target face, thereby improve the utilization rate of light, its light utilization can reach more than 98%.

According to the light distribution requirements in practice, as optimal way, the light that described lens outer surface curved surface 1 upwards reflects and the angle of horizontal plane are 18 degree.Certainly, in actual fabrication, allow the angular error in certain limit.

As mentioned above, lens inside groove 3 is for laying LED light source, and for laying better LED light source, as optimal way, described lens inside groove 3 is a cup-shaped hole, and lens inside groove 3 comprises the inside groove plane of incidence 301 and inside groove side 302.The said inside groove plane of incidence 301 can be plane, can be also quadratic surface.If the inside groove plane of incidence 301 is quadratic surface, its equation is $z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}},$ Wherein, radius $r=\sqrt{x^2+y^2},$ Curved surface coefficient k meets: ﹣ ∞≤k≤﹣ 1.According to the size of general LED light fixture, radius r meets: 0≤r≤10mm.

For depanning better when making these lens, as optimal way, as shown in Figure 3, inside groove side outer edge 303 length are greater than inside groove side inner edge 304 length, and described inside groove side 302 is greater than 1 degree with the angle 8 of optical axis 7.

As shown in Figure 4, part can be reflected downwards by lens outer surface curved surface 1 through the light of upper curved surface 201 total reflections of lens side surface curved surface 2, for making the upwards refraction of more light, as optimal way, described lens side surface curved surface 2 comprises upper curved surface 201 and lower curved face 202, and the distance between lens inside groove 3 and upper curved surface 201 is greater than the distance of lens inside groove 3 and lower curved face 202.So, not only can reduce the above-mentioned light being reflected downwards after upper curved surface 201 total reflections, can also make the light that more LED light source sends by lens outer surface curved surface 1, upwards be reflected after lower curved face 202 total reflections, thereby realized, more light upwards be reflected.

Claims (7)

1.LED lens, comprise mirror body (6), be positioned at the lens outer surface curved surface (1) of mirror body (6) front end, the lens inside groove (3) that is positioned at the lens side surface curved surface (2) of mirror body (6) side and is positioned at mirror body (6) rear portion, it is characterized in that: described lens outer surface curved surface (1) is for making the upwards curved surface of refraction of light, and described lens side surface curved surface (2) is fully reflecting surface.

2. LED lens as claimed in claim 1, is characterized in that: the light that described lens outer surface curved surface (1) upwards reflects and the angle of horizontal plane are 18 degree.

3. LED lens as claimed in claim 1, is characterized in that: described lens inside groove (3) is a cup-shaped hole, and lens inside groove (3) comprises the inside groove plane of incidence (301) and inside groove side (302).

4. LED lens as claimed in claim 3, is characterized in that: the described inside groove plane of incidence (301) is plane.

5. LED lens as claimed in claim 3, is characterized in that: the described inside groove plane of incidence (301) is quadratic surface, and the inside groove plane of incidence (301) equation is $z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}},$ Wherein, radius $r=\sqrt{x^2+y^2},$ Radius r meets: 0≤r≤10mm, curved surface coefficient k meets: ﹣ ∞≤k≤﹣ 1.

6. LED lens as claimed in claim 3, is characterized in that: inside groove side outer edge (303) length is greater than inside groove side inner edge (304) length, and described inside groove side (302) is greater than 1 degree with the angle (8) of optical axis (7).

7. LED lens as claimed in claim 1, it is characterized in that: described lens side surface curved surface (2) comprises upper curved surface (201) and lower curved face (202), the distance between lens inside groove (3) and upper curved surface (201) is greater than the distance of lens inside groove (3) and lower curved face (202).