CN207815220U - A kind of LED total reflection lens, LED light guides and automobile lamp - Google Patents

Abstract

The utility model relates to an LED total reflection lens, an LED light guide body and an automobile lamp. The total reflection lens has an integrated polyhedron structure, and the main structure is a cuboid, which is provided with a light incident surface, a light exit surface, a tapered total reflection surface, Combination of total reflection surface, chamfered total reflection surface and air lens, the air lens is an integrated structure with up and down penetration, the air lens is divided into upper and lower refraction surfaces, the lower refraction surface is a curved surface or plane, and the middle part of the upper refraction surface It is a flat or curved surface, and the two sides of the upper refraction surface are tooth-shaped structures evenly distributed on both sides of the middle. The tooth-shaped structures are total reflection teeth, and the tooth surfaces of the total reflection teeth are total reflection surfaces. The utility model collects and redistributes the light through the change of different surface types, can realize a uniform visual effect, has high energy utilization rate, and uses a small number of LED light sources, which solves the problem that the existing light guide distributes light uniformly. Poor and low energy utilization.

Description

A kind of LED total reflection lens, LED light guide body and automobile lamp

technical field

The utility model relates to the technical field of LED vehicle lamps, in particular to an LED total reflection lens, an LED light guide body and a vehicle lamp.

Background technique

LED has long service life, low energy consumption and mature production technology, and can be produced and supplied on a large scale. It is currently widely used in automotive lighting and decoration, road lighting, projectors, and indoor and outdoor lighting decoration. Since the luminous characteristics of most conventional LEDs are symmetrical Lambertian radiation, they cannot meet the optical requirements of various occasions. 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 reasonably distribute the light energy emitted by the LED chip.

For the secondary optical design of LEDs, reflectors such as aluminum-plated reflective surfaces or reflective cups are generally used for light distribution. The light energy cannot be effectively and evenly distributed through the reflectors. The light in the direction of the optical axis of the LED is strong, and the surrounding light intensity gradually decreases. Automobile signal lamps, lighting fixtures and decorative lamps are required to achieve uniform light emission and meet certain light distribution requirements. The current solutions to achieve linear effects are:

Light linear light source, LED light source is located at one end of the light guide. After the light enters the light guide, it is totally reflected inside and propagates to the other end of the light guide. In order to obtain a linear luminous effect, optical structures such as light guide teeth or microstructures are added on the back of the light exporting surface. , to achieve the effect of linear light source through total reflection. The light energy utilization rate of this light guide solution is low, generally only about 25%. In order to meet the high light intensity requirements, the power of a single LED is required to be very large, and the heat dissipation design requirements for the entire optical system are very high. Large, high cost, very difficult to design and process, and the control ability of microstructure and light guide teeth on light distribution is poor.

Another solution is a light strip solution in which multiple LEDs are densely distributed. Multiple LEDs directly shine through the light distribution mirror, and the light rays of adjacent LEDs cross to achieve a continuous and uniform luminous 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 lot of LEDs, which will greatly increase the cost of the system due to the large number of LEDs.

Another solution is to use a traditional total reflection (TRI) concentrator. Multiple LEDs and multiple TIR lenses cooperate to form a linear luminous effect. The LED light is collimated and then distributed through TRI. This TRI lens is generally around For the circular rotating body of the LED optical axis, for some occasions where the light-emitting surface or light distribution requirements are square, the rotating body needs to be cut, which often leads to a decrease in energy utilization, and more LEDs are used.

Application number 201720009148.0 discloses a LED total reflection lens and LED line light source. The total reflection lens is a polyhedral structure with multiple total reflection surfaces of different surface types. The lens body is provided with refraction holes and multiple reflection holes. , where the reflection holes are distributed on both sides of the refraction hole, and the light is collected and redistributed through a variety of different surface types to achieve uniform distribution of light. However, the plurality of reflection holes provided by the LED total reflection lens are blocked in front and back of the light emitting direction, resulting in a decrease in energy utilization.

Utility model content

The purpose of this utility model is to provide a kind of LED total reflection lens, LED light guide body and automobile lights. The utility model sets the LED total reflection lens into a polyhedral structure, and collects and redistributes the light through the change of different surface shapes. The uniform visual effect can be realized, the energy utilization rate is high, and the number of LED light sources used is small, and the problems of poor light distribution uniformity and low energy utilization rate of the existing light guide are solved.

In order to achieve the above object, the solution of the present utility model is: a LED total reflection lens, the LED total reflection lens is an integrated polyhedron structure, the main part of the polyhedron structure is a cuboid, and the front part of the cuboid is the light incident end, and the rear part is the light exit end, the top surface of the light incident end is provided with a light incident surface, the top of the light incident surface is used to place the LED light source, and the end of the light incident end is provided with a combined total reflection surface The combined total reflection surface is composed of two slopes with a set angle and rotated 180 degrees around the LED light source. The two right-angled positions of the light incident end of the cuboid are provided with chamfers, and the slopes of the chamfers are total reflection. On the surface, a tapered total reflection surface is provided directly opposite the light-emitting surface of the LED light source, and an air lens is provided on the cuboid near the light incident end. The air lens is an integrated hollow structure that penetrates up and down. The air lens is divided into upper and lower refraction surfaces, the lower refraction surface is a curved surface or a plane, the middle part of the upper refraction surface is a plane or a curved surface, and the two sides of the upper refraction surface are tooth-shaped evenly distributed on both sides of the middle part. structure, the tooth-shaped structure is a total reflection tooth, and the tooth surface of the total reflection tooth is a total reflection surface.

Further, according to the LED total reflection lens described in the present utility model, the lower refraction surface of the air lens is an upwardly convex arc surface, and the middle part of the upper refraction surface is a downwardly concave arc surface, and the downwardly concave Both sides of the arc surface are uniformly distributed total reflection teeth. .

Furthermore, according to the LED total reflection lens described in the present utility model, the light incident surface is a plane or a concave surface or a convex surface.

Furthermore, according to the LED total reflection lens of the present invention, the light incident surface is symmetrical with the LED as the center and rotated 360°.

Further, according to the LED total reflection lens described in the present invention, the end face of the light emitting end is a light emitting surface, and the light emitting surface is a plane or a curved surface.

Furthermore, according to the LED total reflection lens of the present invention, patterns or microstructures are provided on the light-emitting surface.

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

The utility model also provides an LED light guide body, the LED light guide body includes at least one LED light-emitting unit, each LED light-emitting unit includes an LED light source and a LED total reflection lens, and the LED light source It is arranged above the light-incident surface of the LED total reflection lens, and the LED light-emitting surface faces the light-incident surface.

The utility model also provides an automobile lamp using the LED light guide.

The beneficial effect achieved by the utility model is that the LED light can be collected, collimated or diffused and redistributed multiple times through the combination of different surface types, and the LED light can be evenly distributed to realize a uniform linear visual effect.

Through the change of the optical structure, the lens can not only realize the collimation of light as a kind of LED collimation device, but also realize the distribution of LED light intensity according to the demand to realize the functional light intensity distribution requirements of automobile lights and so on.

The structure of the main body of the lens of the utility model is reasonable, and the refraction total reflection structure can be changed freely to realize the free distribution of LED light, and realize the uniform lighting effect of higher brightness;

The total reflection lens of the utility model can not only realize the collimation of the LED light, but also diffuse the LED light according to the demand through the change cooperation of the total reflection structure of the refraction;

The processing cost and assembly difficulty are reduced, and the energy utilization rate is high;

The total reflection lens structure realizes longer linear light emission, uses fewer LEDs, and greatly reduces costs.

Description of drawings

Fig. 1 is the structural representation of the utility model lens;

Fig. 2 is the top view of the utility model lens;

Fig. 3 is the A-A sectional view of the top view of the utility model lens and the schematic diagram of the principle of light propagation;

Fig. 4 is the front view of the utility model lens;

Fig. 5 is the B-B sectional view of the front view of the lens of the present invention and the schematic diagram of the principle of light propagation;

Fig. 6 is a composite lens light guide body for the lens of the present invention used in a car lamp.

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

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

LED total reflection lens:

As shown in Figure 1, the LED total reflection lens of the present utility model has an integrated polyhedron structure, the main part of the polyhedron structure is a cuboid, the front part of the cuboid is the light incident end, and the rear part is the light output end, so The top surface of the light incident end is provided with a light incident surface, and the top of the light incident surface is used to place an LED light source. The light incident surface is symmetrical with a 360° rotation around the LED. The light incident surface is a plane, and can also be a concave surface or a convex surface. . The end face of the light emitting end is a light emitting surface, and patterns or microstructures are arranged on the light emitting surface to control the light distribution of the outgoing light.

As shown in Fig. 3 and Fig. 4, a tapered total reflection surface is provided at the position facing the light-emitting surface of the LED light source. The combination of the smooth surface and the conical total reflection surface realizes that the light emitted by the LED light source is completely reflected by the conical total reflection surface, and the light is collimated forward or backward in the lens.

The end of the light incident end is provided with a combined total reflection surface. The combined total reflection surface is composed of two slopes with a set angle and rotated 180 degrees around the LED light source. The external structure is a spindle-like structure. After being totally reflected by the tapered 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, then changes the propagation direction and continues to propagate in the lens, and passes through the incident light. The light distribution after the surface, the tapered total reflection surface and the combined total reflection surface is centered on the LED and uniformly distributed at 180°. The propagation of light, as shown in Figure 3 and Figure 5,

Chamfers are provided at two right-angle positions of the light incident end of the cuboid, and the slopes of the chamfers are total reflection surfaces, and the light passing through the total reflection surfaces can be totally reflected and propagate in the lens.

An air lens is provided on the cuboid near the light incident end, the air lens is an integrated hollow structure that penetrates up and down, the air lens is divided into upper and lower refraction surfaces, and the lower refraction surface is a curved surface or a plane , the middle part of the upper refraction surface is a flat or curved surface, the two sides of the upper refraction surface are tooth-like structures, the tooth-like structures are total reflection teeth, and the tooth surfaces of the total reflection teeth are total reflection surfaces.

The air lens structure recollects and redistributes the LED light passing through the light incident surface, the tapered total reflection surface and the combined total reflection surface. The light collected by the air lens first passes through the cooperation of the lower refraction surface and the upper refraction surface to control the light refraction. direction, a part of the refracted light is collimated and transmitted in the polyhedron lens, and a part of the light is refracted and then directed to the total reflection tooth, and is collected by the air lens total reflection tooth to form a total reflection. In the polyhedron lens of the present invention spread. The remaining part of the light is collected by the total reflection surface formed by the chamfered slope, and the total reflection occurs. The reflection part of the air lens of the utility model is provided with 4 total reflection teeth, and in other embodiments, the number of total reflection teeth can be increased or decreased. See Figure 5 for the propagation of light.

The main body material of the polyhedron described in the utility model is transparent materials such as glass or PC or PMMA.

When in use, the light-emitting surface of the LED faces the light incident surface of the LED total reflection lens and keeps a certain distance from it. Most of the light emitted by the LED is directed to the light incident surface, and passes through the light incident surface and the tapered total reflection successively. surface, through the cooperation of the light incident surface and the conical total reflection surface, the light emitted by the LED is collected, so that the light emitted by the LED is evenly projected onto the inner surface of the conical total reflection surface, and then through the total reflection of the conical total reflection surface, forming an edge along the The light that spreads on the horizontal plane and radiates around the center of the LED light source.

The tapered total reflection surface collects almost all the light incident on the light incident surface, and fully reflects the light. The light after total reflection propagates along the horizontal plane, and the direction of propagation is 180 degrees forward or backward in the lens. , wherein half of the reflected light within the backward 180-degree angle range directly propagates in the polyhedron, and the other half of the reflected light within the forward 180-degree angle range successively passes through the two full reflection surfaces of the combined total reflection surface. After being reflected by the reflective surface, it becomes the reflected light that shoots to the rear within an angle range of 180 degrees. Therefore, after the total reflection of half of them by the combined total reflection surface, all the light rays are horizontally directed to the rear in the 180-degree angle range, and are uniformly distributed within the 180-degree angle range. See Figure 3 for the direction of light propagation.

The light rays that shoot horizontally to the rear at an angle of 180 degrees are collected in two parts. The light rays at a part of the angle are collected by the air lens. After the refraction of the refraction surface on the air lens, a part of the light is collimated and propagates to the light-emitting surface, and the other part of the light is directed to the tooth surface of the total reflection tooth, undergoes total reflection, and then collimates or propagates in the polyhedron structure at a certain angle, and finally emits Emit light evenly towards the light emitting surface.

Among the rays that shoot horizontally to the rear at an angle of 180 degrees, the other part of the rays are collected by the total reflection surface formed by the chamfered slope. 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 utility model collects, collimates or diffuses and redistributes the LED light multiple times through the combination of different surface types, and can evenly distribute the LED light to realize a uniform linear visual effect. Moreover, the arrangement of the tooth-like structure of the air lens of the utility model does not block each other in the light emitting direction, which improves the energy utilization rate.

LED light guide:

As shown in Figure 6, the LED light guide of the present utility model includes at least one LED light-emitting unit, each LED light-emitting unit includes an LED light source and an above-mentioned LED total reflection lens, and the LED light source is arranged on the LED total reflection lens Above the light incident surface, the light emitting surface of the LED light source faces the light incident surface.

The utility model uses a single LED and cooperates with a lens to easily realize a uniform luminous effect with a length of about 60mm and brightness meeting requirements.

LED lights:

The utility model also provides an LED vehicle lamp, which comprises the above-mentioned LED light guide body.

Through the change of the optical structure, the total reflection lens of the utility model can not only realize the collimated emission of light as a kind of LED collimation device, but also realize the distribution of LED light intensity according to the demand, and realize the functional light intensity distribution requirements of automobile lamps and the like. .

Claims (9)

1. a kind of LED total reflection lens, the LED total reflection lens are the polyhedral structure of integral type, the polyhedron knot The main part of structure is a cuboid, and the front of the cuboid is light incidence end, and rear portion is beam projecting end, the light Incidence surface is arranged in the top surface of line incidence end, and the top of the incidence surface is for placing LED light source, the end of the light incidence end It is provided with combination fully reflecting surface, the combination fully reflecting surface rotates 180 by two inclined-planes of setting angle centered on LED light source Degree is constituted, and chamfering is arranged in two square positions of the light incidence end of the cuboid, and the inclined-plane of the chamfering is fully reflecting surface, The face position of the LED light source light-emitting surface is provided with taper fully reflecting surface, it is characterised in that：

It is provided with air-lens on the cuboid, close to light incidence end, the air-lens are integral type, up and down Structure, the air-lens are divided into two planes of refraction up and down, and the lower plane of refraction is curved surface or plane, in the upper plane of refraction Portion is plane or curved surface, and the both sides of the upper plane of refraction are the dentalation for being uniformly distributed on both sides of the middle, the dentalation To be totally reflected tooth, the flank of tooth of the total reflection tooth is fully reflecting surface.

2. LED total reflection lens according to claim 1, which is characterized in that the lower plane of refraction of the air-lens be to The middle part of the arc surface of upper protrusion, upper plane of refraction is to recessed arc surface, and the both sides of the recessed arc surface are uniformly to divide The total reflection tooth of cloth.

3. LED total reflection lens according to claim 1, which is characterized in that the incidence surface is plane or concave surface or convex Face.

4. LED total reflection lens according to claim 3, which is characterized in that the incidence surface is rotated centered on LED 360 ゜ are symmetrical.

5. LED total reflection lens according to claim 1, which is characterized in that the end face at the beam projecting end is light extraction Face, the light-emitting surface are plane or curved surface.

6. LED total reflection lens according to claim 5, which is characterized in that be provided on the light-emitting surface decorative pattern or Micro-structure.

7. LED total reflection lens according to claim 1, which is characterized in that the material of the polyhedral structure is glass Or PC or PMMA.

8. a kind of LED light guides, it is characterised in that：The LED light guides include at least one LED luminescence units, each LED hairs Light unit includes a LED light source and such as claim 1-7 any one of them LED total reflection lens, the LED light source It is arranged in the top of the incidence surface of LED total reflection lens, the light-emitting surface of the LED light source is towards the incidence surface.

9. a kind of automobile lamp using LED light guides as claimed in claim 8.