CN103208581A - Light emitting diode lens - Google Patents

Abstract

A light emitting diode lens comprises a body, a bottom surface, a top surface and a side surface. A light enters the body through at least a portion of the bottom surface. At least one part of the top surface reflects the light, and the center of the top surface is provided with a concave part. The side surface is connected with the bottom surface and the top surface, and at least part of light rays leave the body through the side surface. The body comprises a base material and at least one additive material, the refractive index of the base material is different from that of the additive material, and the weight percentage of the additive material is between 0.5 and 15 percent. The invention can reduce glare, reduce single-point emergent light intensity and improve light diffusion efficiency by mixing and matching high and low refractive indexes, thereby solving the problems of uneven light and too strong glare and further improving luminous efficiency.

Description

LED lens

technical field

The invention relates to a lens, in particular to a light emitting diode lens.

Background technique

Light emitting diode (light emitting diode, LED) components have gradually been widely used due to the advantages of cold light emission, low power consumption, long life, and fast response. The backlight of the traffic signal or the indicator light of the car.

However, in the prior art, an LED lens is usually arranged on the light emitting side of the LED assembly to improve its luminous efficiency. However, due to the traditional lens, when the light is transmitted from the incident surface to the reflective surface for total reflection to the side, there will be uneven light and too strong glare.

Therefore, how to provide a light-emitting diode lens that can solve the problems of uneven light and too strong glare so as to improve the luminous efficiency is one of the current important issues in the industry.

Contents of the invention

The object of the present invention is to provide a light-emitting diode lens that can solve the problems of uneven light and too strong glare, thereby improving luminous efficiency.

The present invention can be realized by adopting the following technical solutions.

An LED lens of the present invention includes a body, a bottom surface, a top surface and a side surface. A light enters the body through at least a part of the bottom surface. At least a part of the top surface reflects the light, and there is a concave part at the center of the top surface. The side connects the bottom surface and the top surface, and at least part of the light leaves the main body through the side. The main body includes a base material and at least one additional material. The refractive index of the base material and the additive material are different, and the weight percentage of the additive material is between 0.5% and 15%.

In one embodiment, the body is substantially disc-shaped.

In one embodiment, the bottom surface has an inner concave surface.

In one embodiment, the bottom surface further has a plane portion, and the plane portion is located around the inner concave surface.

In one embodiment, the planar portion has a microstructure.

In one embodiment, the bottom surface further has a propping portion, and the propping portion protrudes outward.

In one embodiment, the concave portion on the top surface is arranged symmetrically according to a central axis of the body.

In an embodiment, the top surface further has a plane portion, and the plane portion is located between the concave portion and the side surface.

In one embodiment, the tangent slope of the concave portion is positive, or negative, or from positive to negative.

In one embodiment, the substrate includes a polymer material.

In one embodiment, the additive material includes polymethyl methacrylate (PMMA) or aluminum oxide.

In one embodiment, the LED lens further includes a light-receiving part connected to the bottom surface, and the light-receiving part is tapered along a direction away from the bottom surface.

As mentioned above, in the light emitting diode lens of the present invention, there is a concave portion at the center of the top surface, and the performance of light reflection can be improved through the concave portion. In addition, the body includes a base material and at least one additive material, the refractive index of the base material and the additive material are different, and the weight percentage of the additive material is between 0.5% and 15%. By mixing and matching high and low refractive index, glare can be reduced, single-point light intensity can be reduced, and the efficiency of light diffusion can be improved. Through the above features, the light emitting diode lens of the present invention solves the problems of uneven light and too strong glare, thereby improving luminous efficacy.

Description of drawings

1A is a schematic cross-sectional view of a LED lens according to the first embodiment of the present invention;

1B to 1F are schematic diagrams of different microstructures of an LED lens according to the first embodiment of the present invention;

2 is a schematic side view of an LED lens according to a second embodiment of the present invention;

3 is a schematic side view of an LED lens according to a third embodiment of the present invention;

4 is a schematic side view of an LED lens according to a fourth embodiment of the present invention;

5 is a schematic side view of an LED lens according to a fifth embodiment of the present invention; and

FIG. 6 is a schematic side view of an LED lens according to a sixth embodiment of the present invention.

Description of main component symbols:

1. 1a～1e: LED lens

11: Ontology

12: bottom surface

121: Inner concave

122: Plane Department

123: Top Arrival

13: top surface

131: concave part

132: Plane Department

14: side

15: Light receiving department

2: LED die

M1～M5: Microstructure

Detailed ways

An LED lens according to a preferred embodiment of the present invention will be described below with reference to related drawings, wherein the same elements will be described with the same reference numerals.

1A is a schematic cross-sectional view of an LED lens 1 according to the first embodiment of the present invention, which includes a body 11 , a bottom surface 12 , a top surface 13 and a side surface 14 . Wherein, the bottom surface 12 is located at a bottom side of the body 11 , the top surface 13 is located at a top side of the body 11 , and the side surface 14 is located at one side of the body 11 .

In this embodiment, the body 11 is substantially disc-shaped. The body 11 includes a base material and at least one additive material, and the refractive index of the base material and the additive material are different. For example, the base material has a higher refractive index and the additive material has a lower refractive index; or, the base material has a lower refractive index and the additive material has a higher refractive index. By mixing and matching high and low refractive index, glare can be reduced, single-point light intensity can be reduced, and the efficiency of light diffusion can be improved.

The weight percentage of the added material can be between 0.5% and 15%. Wherein, the substrate includes, for example, a polymer material, and the polymer material may be, for example, polycarbonate (PC) or polymethyl methacrylate (PMMA). The additive material includes, for example, aluminum oxide; or when the substrate does not include polymethyl methacrylate, the additive material may include polymethyl methacrylate. The base material and the additive material can be melted or mixed uniformly, and injected into the main body 11 . The additive material can be diffusing particles.

A light enters the main body 11 through at least a part of the bottom surface 12 . In this embodiment, the bottom surface 12 has an inner concave surface 121 . The bottom surface 12 can also have a plane portion 122 located around the inner concave surface 121 , that is, the plane portion 122 is ring-shaped. The planar portion 122 can have a microstructure M1 (as shown in FIG. 1B ). The microstructure M1 is zigzag as an example. In addition, the microstructure can also have other geometric shapes. For example, the microstructure M2 shown in FIG. 1C is a wrinkled surface. (outward convex), the microstructure M3 shown in Figure 1D is a relief surface (convex), the microstructure M4 shown in Figure 1E is a wrinkled surface (concave), and the microstructure M5 shown in Figure 1F is a relief surface ( concave) and so on. When the planar portion 122 has a microstructure, the planar portion 122 can reflect light so that part of the light is emitted from the top surface 13, thereby improving the uniformity of the light; when the planar portion 122 does not have a microstructure, part of the light can be emitted from the planar portion 122 emit, thereby increasing the light emitting angle of the LED lens 1 . In addition, the technical features of the microstructure can also be applied to all embodiments of the present invention.

At least a part of the top surface 13 reflects light, and there is a concave portion 131 at the center of the top surface 13 . Here, the concave portion 131 is substantially symmetrically disposed according to a central axis of the body. The tangent slope of the concave portion 131 can be positive, negative, or from positive to negative from the center to the edge. Here, if viewed from the right half of the concave portion 131 in FIG. 1A, the tangent slope is from positive to zero . This is just an example, not intended to limit the present invention.

The side surface 14 connects the bottom surface 12 and the top surface 13 , and at least part of the light leaves the main body 11 through the side surface 14 .

According to the above, light (e.g. emitted by LEDs) can enter the body 11 from the bottom surface 12 of the LED lens 1 of this embodiment, and be reflected by the top surface 13 to emerge from the side surface 14 . If the planar portion 122 of the bottom surface 12 has microstructures, some light rays can exit from the top surface 13 ; if the planar portion 122 of the bottom surface 12 has no microstructures, then some light rays can exit from the planar portion 122 . Through the structural design of the light-emitting diode lens 1 and the mixing and matching of high and low refractive index materials, glare can be reduced, the intensity of light output from a single point can be reduced, and the efficiency of light diffusion can be improved, thereby improving the luminous efficiency.

FIG. 2 is a schematic side view of an LED lens 1a according to a second embodiment of the present invention. The main difference from the first embodiment is that the top surface 13 of the LED lens 1 a further has a planar portion 132 , and the planar portion 132 is located between the concave portion 131 and the side surface 14 . Here, take the planar portion 132 substantially perpendicular to the side surface 14 as an example.

FIG. 3 is a schematic side view of an LED lens 1b according to a third embodiment of the present invention. The main difference from the second embodiment is that the range of the flat portion 132 of the top surface 13 of the LED lens 1b is larger than the range of the flat portion 132 of the LED lens 1a, and the concave portion 131 of the top surface 13 of the LED lens 1b The radius of curvature is smaller than the radius of curvature of the concave portion 132 of the LED lens 1a.

FIG. 4 is a schematic side view of an LED lens 1c according to a fourth embodiment of the present invention. The main difference from the above embodiments is that the tangent slope of the concave portion 131 of the top surface 13 of the light emitting diode lens 1c is from positive to negative or from negative to positive, that is, the crossing slope is zero, so that the center of the top surface 13 to the side surface 14 The outline becomes a curve. Here, if viewed from the right half of the concave portion 131 in FIG. 4 , the slope of the tangent line is from positive to negative.

FIG. 5 is a schematic side view of an LED lens 1d according to a fifth embodiment of the present invention. The main difference from the first embodiment is that the bottom surface 12 of the LED lens 1d also has a propping portion 123 , and the propping portion 123 protrudes outward from the main body, in this case protruding away from the top surface 13 . The abutting portion 123 is annular and located around the inner concave surface 121 of the bottom surface 12 . Through the arrangement of the abutting portion 123 , an LED die 2 can be accommodated in the abutting portion 123 , thereby making the product thinner. Wherein, the LED die 2 can be disposed on a circuit board (not shown in the figure), and the circuit board can be connected to the abutting portion 123 . In addition, the LED die 2 can also be disposed in the inner concave surface 121 of the bottom surface 12 of all the LED lenses mentioned above.

FIG. 6 is a schematic side view of an LED lens 1e according to a sixth embodiment of the present invention. The main difference from the above embodiments is that the LED lens 1 e further includes a light receiving portion 15 connected to the bottom surface 12 , and the light receiving portion 15 tapers away from the bottom surface 12 . The light receiving part 15 can be a hollow body, and its inner surface can be coated with a reflective film. The light receiving portion 15 can be a separate component or integrally formed with the main body 1 . The LED die 2 can be disposed inside or outside the light receiving portion 15 ; here, the LED die 2 is disposed outside the light receiving portion 15 as an example. The light receiving portion 15 can be applied to the LED lenses of all the above-mentioned embodiments.

Through the light emitting diode lens of the above different embodiments, the light emitting effect of the light emitting diode lens can be more varied, thereby expanding its applicability. In addition, the LED lens of all the embodiments of the present invention can be applied to LED dies that emit light at a large angle, such as a light emitting angle greater than 120 degrees.

To sum up, in the light emitting diode lens of the present invention, there is a concave portion at the center of the top surface, and the performance of light reflection can be improved through the concave portion. In addition, the body includes a base material and at least one additive material, the refractive index of the base material and the additive material are different, and the weight percentage of the additive material is between 0.5% and 15%. By mixing and matching high and low refractive index, glare can be reduced, single-point light intensity can be reduced, and the efficiency of light diffusion can be improved. Through the above features, the light emitting diode lens of the present invention solves the problems of uneven light and too strong glare, thereby improving luminous efficacy.

The above description is only illustrative, not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included within the scope defined in the claims.

Claims (12)

1. a led lens is characterized in that, comprising:

One body;

One bottom surface, a light enters described body via at least a portion of described bottom surface;

One end face, its at least a portion reflects described light, and described end face centre has a recess; And

One side links described bottom surface and described end face, and at least part of described light leaves described body via described side,

Wherein, described body comprises a base material and at least one interpolation material, and the refraction coefficient of described base material and described interpolation material is inequality, and the percentage by weight of described interpolation material is between 0.5% to 15%.

2. led lens according to claim 1 is characterized in that, described body essence is in the form of annular discs.

3. led lens according to claim 1 is characterized in that, described bottom surface has an inner concave.

4. led lens according to claim 3 is characterized in that, described bottom surface also has a planar portions, described planar portions be positioned at described inner concave around.

5. led lens according to claim 4 is characterized in that, described planar portions has a micro-structural.

6. led lens according to claim 1 is characterized in that, described bottom surface also has a supporting part, and described supporting part outwards protrudes.

7. led lens according to claim 1 is characterized in that, the described recess of described end face is symmetrical arranged according to a central shaft of described body.

8. led lens according to claim 1 is characterized in that, described end face also has a planar portions, and described planar portions is between described recess and described side.

9. led lens according to claim 1 is characterized in that, the tangent slope of described recess is for just or for negative or by just to negative.

10. led lens according to claim 1 is characterized in that, described base material comprises a macromolecular material.

11. led lens according to claim 1 is characterized in that, described interpolation material comprises polymethyl methacrylate or aluminium oxide.

12. led lens according to claim 1 is characterized in that, also comprises:

One light absorbing part links with described bottom surface, and described light absorbing part is gradually-reducing shape along the direction away from described bottom surface.

Images