WO2019080634A1 - Led total reflection lens, led light guide body, and automobile lamp - Google Patents

Abstract

An LED total reflection lens, an LED light guide body, and an automobile lamp. The LED total reflection lens is of an integrated polyhedron structure; the main structure is a cuboid, and is provided with a light-entry surface (2), a light-exit surface (8), a conical total-reflection surface (3), a combined total-reflection surface (4), a chamfered total-reflection surface (7-1, 7-2), and an air lens. The air lens is of an integrated up-down through structure. The air lens is divided into an upper refraction surface (5-2) and a lower refraction surface (5-1). The lower refraction surface (5-1) is a curved surface or a plane. The middle portion of the upper refraction surface (5-2) is a plane or a curved surface; tooth-shaped structures uniformly distributed on the two sides of the middle portion are located on the two sides of the upper refraction surface (5-2), and the tooth-shaped structures are total-reflection teeth (6-1~6-4); and the tooth surfaces of the total-reflection teeth (6-1~6-4) are total-reflection surfaces. The LED total reflection lens is set as a polyhedron structure; by means of changes of different surface types, light rays are collected and then are allocated, a uniform visual effect can be achieved, the energy utilization rate is high, the number of LED light sources used is small, and the problems of poor light allocation uniformity of the existing lightguide and the low energy utilization rate are resolved.

Description

LED total reflection lens, LED light guide body and automobile lamp Technical field

The invention relates to the technical field of LED vehicle lights, in particular to an LED total reflection lens, an LED light guide body and an automobile lamp.

Background technique

Long LED life, low energy consumption and mature production technology, can be produced on a large scale. Currently, it is widely used in automotive lighting and decoration, highway lighting, projectors and indoor and outdoor lighting decoration. Since the luminescence characteristics of most conventional LEDs are symmetric Lambertian radiation, the optical requirements of various occasions cannot be met. In order to meet the light efficiency and light distribution requirements of various occasions and improve the performance of the system, it is necessary to accurately control the secondary optical design of the light distribution of the LED, and rationally distribute the light energy emitted by the LED chip.

For the secondary optical design of the LED, a reflector such as an aluminized reflective surface or a reflector cup is generally used for light distribution, and the light energy cannot be efficiently and uniformly distributed by the reflector, and the light in the direction of the LED optical axis is strong, and the ambient light intensity is gradually reduced. Automotive signal lights, lighting fixtures and decorative lights are required to achieve uniform illumination, while meeting certain light distribution requirements. The current solutions for achieving linear effects are:

A light-conducting light source, the LED light source is located at one end of the light guide, and after the light enters the light guide, the light is totally reflected internally to the other end of the light guide. In order to obtain a linear light-emitting effect, an optical structure such as a light guide tooth or a microstructure is added on the back side of the light-extracting light surface. The effect of a linear light source is achieved by total reflection. The light energy utilization rate of the light guiding scheme is low, generally only about 25%. In order to achieve large light intensity requirements, the power of a single LED is required to be very large, and the heat dissipation design of the entire optical system is very high, and the long light guide and the mold are relatively high. Large, high cost, design and processing is very difficult, and the microstructure and light guide teeth have poor control of light distribution.

Another solution is a light distribution scheme in which a plurality of LEDs are densely distributed. A plurality of LEDs are directly transmitted through the light distribution mirror, and the light rays of adjacent LEDs are crossed to achieve a continuous uniform illumination effect. This design is simple and easy to install, but to obtain a more uniform linear light source, a longer linear light source requires a large number of LEDs, and the number of LEDs is large, which greatly increases the cost of the system.

Another solution is to use a conventional total reflection (TRI) concentrator. Multiple LEDs and multiple TIR lenses are combined to form a linear illuminating effect. The TRI lens is collimated by TRI, and the TRI lens is generally wound. The circular rotating body of the LED optical axis, in the case where some light emitting surfaces or light distribution requirements are square, it is necessary to cut the rotating body, which tends to cause a decrease in energy utilization rate, and also uses a larger number of LEDs.

Application No. 201720009148.0 discloses an LED total reflection lens and an LED line light source. The total reflection lens is a polyhedral structure having a plurality of totally reflective surfaces of different shapes, and the lens body is provided with a refractive hole and a plurality of reflection holes. The reflection holes are distributed on both sides of the refraction hole, and the light is collected and distributed through a plurality of different surface types to achieve uniform distribution of light. However, the plurality of reflection holes provided by the LED total reflection lens are shielded before and after the light emission direction, resulting in a decrease in energy utilization rate.

Summary of the invention

An object of the present invention is to provide an LED total reflection lens, an LED light guide body and an automobile lamp. The invention provides an LED total reflection lens into a polyhedral structure, and collects and redistributes light through different face types, thereby realizing The uniform visual effect, the high energy utilization rate, and the small number of LED light sources are used, solving the problem that the existing light guides have poor uniformity in light distribution and low energy utilization rate.

In order to achieve the above object, an aspect of the present invention is: an LED total reflection lens, wherein the LED total reflection lens is an integrated polyhedral structure, the main body portion of the polyhedral structure is a rectangular parallelepiped, and the front portion of the rectangular parallelepiped is The light incident end, the rear portion is a light exit end, the top surface of the light incident end is disposed on the light incident surface, and the LED light source is disposed above the light incident surface, and the end portion of the light incident end is provided with a combined total reflection surface. The combined total reflection surface is formed by rotating two oblique surfaces of the set angle by 180 degrees around the LED light source, and two right angle positions of the light incident end of the rectangular parallelepiped are chamfered, and the chamfered surface of the chamfer is a total reflection surface a positive total reflection surface of the LED light source is provided with a tapered total reflection surface, and an air lens is disposed on the rectangular parallelepiped near the light incident end, and the air lens is an integrated hollow structure that penetrates vertically. The air lens is divided into upper and lower refractive surfaces, the lower refractive surface is a curved surface or a plane, and the middle of the upper refractive surface is a plane or a curved surface, and both sides of the upper refractive surface are evenly distributed. Both sides of the central toothed structure, the toothed structure is totally teeth with tooth surfaces of the total reflection surface of the total reflection.

Further, according to the LED total reflection lens of the present invention, the lower refractive surface of the air lens is an upwardly convex circular arc surface, and the central portion of the upper refractive surface is a downward concave arc surface, the concave Both sides of the circular arc surface are uniformly distributed total reflection teeth. .

Further, according to the LED total reflection lens of the present invention, the light incident surface is a flat surface or a concave surface or a convex surface.

Further, according to the LED total reflection lens of the present invention, the light incident surface is 360 symmetrical around the LED.

Further, according to the LED total reflection lens of the present invention, an end surface of the light exit end is a light exit surface, and the light exit surface is a plane or a curved surface.

Further, according to the LED total reflection lens of the present invention, the light-emitting surface is provided with a pattern or a microstructure.

Further, according to the LED total reflection lens of the present invention, the material of the polyhedral structure is glass or PC or PMMA.

The present invention also provides an LED light guide body, the LED light guide body comprising at least one LED light emitting unit, each LED light emitting unit comprising an LED light source and one of the LED total reflection lenses, the LED light source setting Above the light incident surface of the LED total reflection lens, the LED light emitting surface faces the light incident surface.

The present invention also provides an automobile lamp using the LED light guide.

The beneficial effects achieved by the invention are that the LED light is collected, collimated or diffused and redistributed multiple times through different combinations of face shapes, and the LED light can be evenly distributed to achieve a uniform linear visual effect.

The lens can realize the collimation of light as an LED collimating device through the change of the optical structure, and realize the functional light intensity distribution requirement of the automobile light and the like according to the demand of the LED light intensity.

The lens main body structure of the invention is reasonable, and the refractive total reflection structure can be freely changed to realize free distribution of LED light, thereby achieving uniform illumination effect of higher brightness;

The total reflection lens of the invention can realize the collimation of the LED light and diffuse the LED light as needed by the variation matching of the refractive total reflection structure;

Reduced processing cost and assembly difficulty, and high energy utilization rate;

The total reflection lens structure realizes longer linear illumination and uses fewer LEDs, which greatly reduces the cost.

DRAWINGS

Figure 1 is a schematic view showing the structure of a lens of the present invention;

Figure 2 is a plan view of the lens of the present invention;

3 is a cross-sectional view of the lens of the present invention taken along the line A-A and a schematic diagram of the principle of light propagation;

Figure 4 is a front elevational view of the lens of the present invention;

Figure 5 is a cross-sectional view of the B-B of the front view of the lens of the present invention and a schematic diagram of the principle of light propagation;

Figure 6 is a combined lens light guide for a vehicle headlight according to the lens of the present invention.

In the figure, 1, LED light source; 2, light-incident surface; 3, tapered total reflection surface; 4, combined total reflection surface; 5-1, lower refractive surface of air lens; 5-2, upper refractive surface of air lens ; 6-1 to 6-4, total reflection teeth of the air lens reflection portion; 7-1 and 7-2, chamfered total reflection surface; 8, light-emitting surface.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

LED total reflection lens:

As shown in FIG. 1 , the LED total reflection lens of the present invention is an integrated polyhedral structure, and the main body portion of the polyhedral structure is a rectangular parallelepiped, the front portion of the rectangular parallelepiped is a light incident end, and the rear portion is a light exit end. The top surface of the light incident end is disposed on the light incident surface, and the LED light source is disposed above the light incident surface, and the light incident surface is 360 symmetrical with the LED as the center, and the light incident surface is a plane, and may also be a concave surface or a convex surface. The end surface of the light exit end is a light exit surface, and a pattern or a microstructure is arranged on the light exit surface to achieve a light distribution distribution for controlling the emitted light.

As shown in FIG. 3 and FIG. 4, the LED light source emitting surface is disposed at a position opposite to the front surface of the LED light source, and the tapered total reflection surface causes the light entering the lens through the light incident surface to form a total reflection in the lens. The surface of the smooth surface and the conical total reflection surface cooperate to realize that the light emitted from the LED light source is totally reflected by the cone total reflection surface, and the light is collimated forward or backward in the lens.

The end of the incident end of the light is provided with a combined total reflection surface, and the combined total reflection surface is formed by rotating the two inclined surfaces of the set angle by 180 degrees around the LED light source, and the external structure is a spindle-like structure. After the total reflection of the cone-shaped total reflection surface, half of the light directly propagates in the lens of the present invention, and the other half of the light passes through the two total reflections of the combined total reflection surface, and then changes the propagation direction to continue to propagate in the lens, passing through the light-incident surface. The light distribution after the cone total reflection surface and the combined total reflection surface is centered on the LED and is evenly distributed at 180 。. The propagation of light, as shown in Figures 3 and 5,

The two right-angled positions of the light incident end of the rectangular parallelepiped are chamfered, and the inclined surface of the chamfered surface is a total reflection surface, and the light passing through the total reflection surface can be totally reflected and propagated in the lens.

An air lens is disposed on the rectangular parallelepiped near the incident end of the light, the air lens is an integrated hollow structure that is vertically penetrated, and the air lens is divided into upper and lower refractive surfaces, and the lower refractive surface is curved or flat. The middle surface of the upper refractive surface is a plane or a curved surface, the two sides of the upper refractive surface are tooth-shaped structures, the tooth-shaped structure is a total reflection tooth, and the tooth surface of the total reflection tooth is a total reflection surface.

The air lens structure collects and redistributes the LED light passing through the light incident surface, the tapered total reflection surface and the combined total reflection surface, and the light collected by the air lens is firstly transmitted through the lower refractive surface and the upper refractive surface to refract light to control the light propagation. In the direction, a part of the refracted light is collimated in the polyhedral lens, and a part of the light is refracted, and then is directed to the total reflection tooth, and is collected by the total reflection of the air lens to form total reflection, which propagates in the polyhedral lens of the present invention. . The remaining part of the light is collected by the total reflection surface formed by the chamfered bevel, and total reflection occurs. The reflecting portion of the air lens of the present invention is provided with four total reflection teeth. In other embodiments, the number of total reflection teeth can be increased or decreased. See Figure 5 for the propagation of light.

The host material of the polyhedron of the present invention is glass or a transparent material such as PC or PMMA.

In use, the light emitting surface of the LED is directed toward the light incident surface of the LED total reflection lens, and is kept at a certain distance therefrom, and most of the light emitted by the LED is directed toward the light incident surface, and passes through the light incident surface and the cone total reflection. The light emitted by the LED is collected by the cooperation of the light incident surface and the tapered total reflection surface, so that the light emitted from the LED is uniformly projected onto the inner surface of the tapered total reflection surface, and then the total reflection of the tapered total reflection surface is formed along the surface. The horizontal plane transmits light that radiates around the LED light source.

The cone-shaped total reflection surface collects almost all the light rays incident on the light surface, and totally reflects the light rays. The total reflection light propagates along the horizontal plane, and the propagation direction is 180 degrees forward or backward to collimate in the lens. Wherein, half of the rays of the reflected light in the backward 180-degree angle directly propagate in the polyhedron, and the other half of the reflected light is located in the forward 180-degree angle and successively passes through the two combined total reflection surfaces. After the reflection surface is reflected, it is reflected light that is incident within a range of 180 degrees to the rear. Therefore, after combined total reflection faces half of the total reflection, all of the light becomes horizontally directed toward the rear 180-degree angle and uniformly distributed over a 180-degree angle. See Figure 3 for the direction of light propagation.

Light rays that are directed horizontally to the rear 180 degree angle are collected in two parts. A part of the angle of light is collected by the air lens, firstly directed to the lower refractive surface of the air lens, refracted through the refractive surface of the air lens, into the air lens, and then through After the refraction of the refracting surface on the air lens, a part of the light collimates and reaches the illuminating surface, and another part of the ray is directed to the tooth surface of the total reflection tooth, which is totally reflected, and then collimated or propagated at a certain angle in the polyhedral structure. To the light surface, evenly out.

In the light that is horizontally directed toward the rear 180-degree angle, the other portion of the light is collected by a total reflection surface composed of chamfered slopes. The tooth surface of the total reflection tooth and the chamfered slope can totally reflect the collected light, and the reflected light is directed backward. See Figure 5 for the direction of light propagation.

The lens of the invention collects, collimates or diffuses and redistributes the LED light multiple times through different combinations of face shapes, and can evenly distribute the LED light to achieve a uniform linear visual effect. Moreover, the arrangement of the tooth structures of the air lens of the present invention does not block each other in the direction of light emission, thereby improving energy utilization.

LED light guide:

6, the LED light guide of the present invention comprises at least one LED lighting unit, each LED lighting unit comprises an LED light source and an LED total reflection lens, and the LED light source is disposed in the LED total reflection lens. Above the smooth surface, the light emitting surface of the LED light source faces the light incident surface.

The invention uses a single LED with a lens to easily realize a uniform illumination effect with a length of about 60 mm and a brightness satisfying the requirements.

LED lights:

The invention also provides an LED vehicle lamp comprising the above-mentioned LED light guide body.

The total reflection lens of the invention can realize the collimation of light as an LED collimating device through the change of the optical structure, and can realize the distribution of the LED light intensity according to the demand, and realize the functional light intensity distribution requirements of the automobile lamp and the like.

Claims (9)

An LED total reflection lens, wherein the LED total reflection lens is an integrated polyhedral structure, the main body portion of the polyhedral structure is a rectangular parallelepiped, the front portion of the rectangular parallelepiped is a light incident end, and the rear portion is a light exit end. a top surface of the light incident end is disposed on the light incident surface, and an upper surface of the light incident surface is used for placing an LED light source, and an end of the light incident end is provided with a combined total reflection surface, and the combined total reflection surface is set at an angle The two inclined surfaces are rotated 180 degrees around the LED light source, and the two right-angled positions of the light incident end of the rectangular parallelepiped are chamfered, the chamfered inclined surface is a total reflection surface, and the LED light source is directly facing the light-emitting surface. A tapered total reflection surface is provided, which is characterized by: An air lens is disposed on the rectangular parallelepiped near the incident end of the light, wherein the air lens is an integrated, vertically penetrating structure, and the air lens is divided into upper and lower refractive surfaces, and the lower refractive surface is a curved surface or a plane. The middle portion of the upper refractive surface is a plane or a curved surface, and the two sides of the upper refractive surface are tooth-like structures uniformly distributed on both sides of the middle portion, the tooth-shaped structure is a total reflection tooth, and the tooth surface of the total reflection tooth is Fully reflective surface. The LED total reflection lens according to claim 1, wherein the lower refractive surface of the air lens is an upwardly convex circular arc surface, and the central portion of the upper refractive surface is a downward concave circular arc surface, the lower portion Both sides of the concave arc surface are evenly distributed total reflection teeth. The LED total reflection lens according to claim 1, wherein the light incident surface is a flat surface or a concave surface or a convex surface. The LED total reflection lens according to claim 3, wherein the light incident surface is 360 symmetrical around the LED. The LED total reflection lens according to claim 1, wherein an end surface of the light exit end is a light exit surface, and the light exit surface is a plane or a curved surface. The LED total reflection lens according to claim 5, wherein the light-emitting surface is provided with a pattern or a microstructure. The LED total reflection lens according to claim 1, wherein the material of the polyhedral structure is glass or PC or PMMA. An LED light guide body, wherein the LED light guide body comprises at least one LED light emitting unit, each LED light emitting unit comprises an LED light source and an LED full according to any one of claims 1-7 a reflective lens, the LED light source is disposed above a light incident surface of the LED total reflection lens, and the LED light emitting surface faces the light incident surface. An automotive lamp using the LED light guide of claim 8.

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