CN108873142B

CN108873142B - Light guide component and automobile lamp with same

Info

Publication number: CN108873142B
Application number: CN201610722255.8A
Authority: CN
Inventors: 徐岩修
Original assignee: Changchun Hella Automotive Lighting Co Ltd
Current assignee: Changchun Hella Automotive Lighting Co Ltd
Priority date: 2016-08-25
Filing date: 2016-08-25
Publication date: 2020-02-28
Anticipated expiration: 2036-08-25
Also published as: CN108873142A

Abstract

The invention discloses a light guide component and an automobile lamp with the same, and relates to the field of vehicle illumination. A light guide component is characterized in that a coupling structure comprises a first coupling area and a second coupling area, a light source is positioned outside a light inlet surface of an optical unit, emitted light enters the coupling structure through the light inlet surface, the light passing through the first coupling area is reflected and then directly leaves from the light outlet surface along the horizontal light outlet direction, and the light passing through the second coupling area is reflected and then leaves from the light outlet surface along the horizontal light outlet direction after undergoing primary total reflection by a reflecting surface; the coupling structure and the reflecting surface are distributed in axial symmetry with respect to the horizontal light-emitting direction. An automobile lamp includes the light guide member as described above, a light source and a PCB board corresponding to the light guide member, a holder fixing the light guide member, and a lamp housing. The invention has novel structure, simple design, high efficiency and uniformity, and can reduce the design cost, the material cost and the die cost.

Description

Light guide component and automobile lamp with same

Technical Field

The invention relates to the field of vehicle lighting, in particular to a light guide component; the invention also relates to an automobile lamp with the light guide component.

Background

In the field of vehicle illumination, it is a common technical means to combine a plurality of LED light sources with a light guide component to realize a linear structure model. Because the LED is a point light source, the energy density of the LED is gradually reduced from the center to the outer side, and even after the reflection and refraction of secondary light distribution, the light distribution of the adjacent LED area is still different from the light distribution right in front of the LED; however, the uniformity of the lighting effect is required in the vehicle shape, and not only is the uniformity of the lighting effect of the lamps required to be high when viewed from the front direction of the vehicle, but also the uniform and neat line shape is required to be maintained when viewed from the inside and the outside of the vehicle.

Most of the existing thick-wall light guide components use a flexible PCB (printed circuit board) matched with an aluminum substrate as a light source, and the solution scheme is high in cost of a single PCB, complex in installation structure and relatively large in installation error. Furthermore, the light beam produced by the conventional thick-walled light guide member still has insufficient uniformity.

Currently, various structures have been created to achieve this goal. However, the common problems are that the structure is complicated (resulting in complicated design and complicated mold), or the structure is simple but the uniformity is not good enough, or a plurality of LEDs are used for realizing the uniformity, thereby reducing the efficiency of the LED light source.

Disclosure of Invention

The present invention is directed to a coupling structure including secondary light distribution to overcome the above-mentioned technical drawbacks, thereby realizing a light guide member for emitting uniform light.

The invention discloses a light guide component, which comprises at least one optical unit, wherein the optical unit is in a thin plate shape and comprises a light incident surface, a coupling structure, a reflecting surface and a light emergent surface, and the coupling structure comprises a first coupling area and a second coupling area; the light source is positioned outside the light inlet surface of the optical unit, emitted light enters the coupling structure through the light inlet surface, the light passing through the first coupling area is reflected and then directly leaves from the light outlet surface along the horizontal light outlet direction, and the light passing through the second coupling area is reflected and then leaves from the light outlet surface along the horizontal light outlet direction after undergoing once total reflection by the reflecting surface; the coupling structure and the reflecting surface are distributed in axial symmetry with respect to the horizontal light-emitting direction.

Preferably, the coupling structure further includes a third coupling region, the light source is located outside the light incident surface of the optical unit, the emitted light enters the coupling structure through the light incident surface, and after being reflected by the third coupling region, the light is reflected by the reflecting surface and exits from the light emitting surface along the horizontal collimation direction after undergoing two total reflections.

Preferably, the light emitting surface of the optical unit is a plane or a pattern structure surface.

Preferably, the cross-sections of the first coupling region and the second coupling region are both parabolic.

Preferably, the cross-section of the third coupling region is parabolic.

Preferably, the first coupling region and the second coupling region enclose a square or rectangular structure.

Preferably, the first coupling region, the second coupling region and the third coupling region enclose a square or rectangular structure.

Preferably, the cross section of the reflecting surface is W-shaped, and each side of the W is a straight line.

Preferably, the light guide member includes at least two optical units, and the optical units are stacked in parallel and staggered from top to bottom or arranged in series in the same plane.

The invention also discloses an automobile lamp, which comprises the light guide component, a light source and a PCB corresponding to the light guide component, a bracket for fixing the light guide component and a lamp shell.

The invention adopts the principle of Total Internal Reflection (TIR), and simply and skillfully realizes the uniformity of emergent rays and the high efficiency of a light source through a plurality of paraboloids which are symmetrically distributed and a W-shaped structure at the rear part.

The invention has novel structure, simple design, high efficiency and uniformity, and can reduce the design cost, the material cost and the die cost.

After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:

1. according to the light guide component provided by the invention, multiple light distribution can be realized in the light guide component, so that the light emitting direction difference of each LED light emitting element is adjusted, and the brightness of the lighting area of the lamp in each direction is uniform and consistent.

2. According to the light guide member of the present invention, the mounting structure provided thereon can minimize the influence of the non-optical structure on the optical system.

Drawings

FIG. 1a is a top view of a light guide member according to a first preferred embodiment of the present invention;

FIG. 1b is a cross-sectional view A-A of FIG. 1 a;

FIG. 2 is a top view of a light guide member according to a second preferred embodiment of the present invention;

FIG. 3a is a schematic view of a light guide member according to a third preferred embodiment of the present invention

FIG. 3b is a top view of a light guide member according to a third preferred embodiment of the present invention;

FIG. 3c is a cross-sectional view B-B of FIG. 3B;

FIG. 4 is a schematic view of a light guide member according to a fourth preferred embodiment of the present invention;

reference numerals:

first embodiment

100-first optical element, 1-first coupling region, 2-first part of second coupling region, 3-third coupling region, 4-second part of second coupling region, 5-8W-shaped reflecting plane,

9-the emergent light reflected by the first part of the second coupling area and reflected once by the reflecting surface 7,

10-the emergent light reflected by the third coupling area and the two total reflections of the reflecting

surfaces

5 and 7,

11-the outgoing light reflected by the first coupling region,

12-the emergent light reflected by the third coupling area and reflected twice by the reflecting

surfaces

6 and 8,

13-the emergent light reflected by the second part of the second coupling area and totally reflected once by the reflecting surface 8,

14-LED light source, 15-light incident surface;

second embodiment

20-a second optical element, 21-a first coupling region, 22-a first part of a second coupling region, 23-a second part of a second coupling region, 24-a coupling structure boundary, 25, 26-a reflection plane,

27-the emergent light reflected by the first part of the second coupling region and the total reflection of the reflection surface 25,

28-the outgoing light reflected by the first coupling region,

29-the emergent light reflected by the second part of the second coupling area and reflected once by the reflecting surface 26;

third embodiment

30-the first light-guiding member,

31-the optical elements of the first layer,

32-the optical elements of the second layer,

33-a first coupling structure, 34-a second coupling structure;

fourth embodiment

40-the second light-guiding member,

41-43 are arranged in succession, a first optical unit, a second optical unit, a third optical unit,

45-the emergent surface of the pattern structure surface.

Detailed Description

The invention is further illustrated by the following specific examples in conjunction with the accompanying drawings.

As shown in the drawings, a

light guide member

30 or 40 according to a preferred embodiment of the present invention, which is used for signal lighting in a head light or a tail light of a vehicle, includes at least one

optical unit

100 or 20, and each light guide member may be integrally formed of a plurality of optical units.

In the first preferred embodiment of the present invention, the optical unit 100 includes an incident surface 15, a first coupling region 1, a first portion 2 and a second portion 4 of a second coupling region, a third coupling region 3, and coupling regions 1-4 enclosing a square coupling structure, a W-like reflective planar structure 5-8, and an emergent surface (not labeled in the figure) of the optical unit; the horizontal light-emitting direction of the light is H-H ', the square coupling structure and the W-shaped reflecting surface form axial symmetry with respect to HH ', and the convergence points of the first coupling area 1, the second coupling areas 2 and 4 and the third coupling area 3 fall on the HH ' axis.

In shape, the outer surfaces of the first coupling region 1, the second coupling regions 2 and 4, and the third coupling region 3 are all paraboloids, wherein the axis of the paraboloid 1' (not marked in the figure) is parallel to the light emitting direction, the focal length is between 0.5 mm and 15mm according to the actual situation, the focal point is located between 0mm and 50mm below the light emitting surface of the LED, and the focal point needs to be determined according to the refractive index of the actual material, the light emitting mode of the LED, and the distance between the LED and the light incident surface 15, so as to ensure that the light totally reflected by the paraboloid is parallel to the axis direction. The other three parabolas 2 ', 3', 4 '(not shown) are rotated from the parabola 1'. The square surface above the paraboloid is a structural auxiliary surface, and the side length of the structural auxiliary surface is assumed to be a. a is between 1 and 40mm according to actual conditions. The structure auxiliary surface can also be in the shape of a rectangle, a circle, a polygon, or the like. The distance b between the light emitting surface of the LED and the light incident surface 15 of the device is 0-20mm, the LED light source 14 is positioned right below the vertex of the intersection of the four paraboloids (i.e. the convergence point of the coupling structure), and the distance c between the vertex of the intersection of the four paraboloids and the light incident surface 15 is 0-15 mm.

The LED light source 14 emits light which is refracted for the first time through the bottom surface, the four paraboloids 1 ', 2', 3 ', 4' deflect the light uniformly along the respective axial direction through internal total reflection, wherein the light 11 coming out of the paraboloid 1 'directly realizes the transmission of the light emitting direction, the light 9, 13 coming out of the paraboloids 2', 4 'generates internal total reflection again after passing through the 7, 8 surfaces of the W structure to realize the requirement of the final light emitting direction, the light 10, 12 coming out of the paraboloid 3' realizes the transmission of the final light along the horizontal light emitting direction through the two internal total reflection of the 5, 7 surfaces of the W-like structure and the 6, 8 surfaces of the W-like structure, wherein the included angle between the reflecting

surfaces

5, 7 is α, the included angle between the reflecting

surfaces

5, 6 is β, and the included angle between the reflecting

surfaces

6, 8 is gamma, α and gamma ranges from 88 to 92 degrees.

In a second preferred embodiment of the invention, said optical unit 20 comprises similarly a first coupling area 21, a first portion 22 and a second portion 23 of a second coupling area, said coupling areas 21-23 enclosing a square coupling structure of the optical unit, the reflecting structure being enclosed by reflecting planes 24-26, and a light exit surface. The horizontal light-emitting direction of the light is H-H ', the square coupling structure and the reflecting surface form axial symmetry with respect to HH ', and the convergence point of the first coupling area 21, the

second coupling areas

22 and 23 is positioned on the HH ' axis.

Similarly, the outer surfaces of the coupling regions 21 to 23 are paraboloids 21 'to 23' (not shown in the drawings), respectively, and after light emitted by the LED light source is refracted once through the light incident surface, the light is uniformly deflected along the respective axial directions by the three paraboloids 21 ', 22', 23 'through internal total reflection, wherein the light 28 coming out of the paraboloid 21' directly realizes that the light is transmitted along the horizontal light emitting direction; the light rays coming out of the paraboloids 22 'and 23' pass through the

surfaces

25 and 26 of the reflecting structure and then undergo total internal reflection, and finally, the light is transmitted along the horizontal light-emitting direction.

In a third preferred embodiment of the invention, the light-guiding member 30 comprises two

optical units

31, 32 of the first embodiment, wherein the second optical unit 32 is superimposed in parallel on the first optical unit 31 with a fault, the

coupling structures

33, 34 of the two optical units being aligned about the axis of symmetry a-a.

In a fourth preferred embodiment of the present invention, the light guide member 40 includes three optical units 41-43 of the first embodiment, wherein the first optical unit 41, the second optical unit 42 and the third optical unit 43 extend continuously in the horizontal direction, and the light emitting surface 45 has an optical pattern.

It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.

Claims

1. A light guide component is used for automobile illumination and comprises at least one optical unit, wherein the optical unit is in a thin plate shape and comprises a light incoming surface, a coupling structure, a reflecting surface and a light outgoing surface, and the light guide component is characterized in that: the coupling structure comprises a first coupling region and a second coupling region; the light source is positioned outside the light inlet surface of the optical unit, emitted light enters the coupling structure through the light inlet surface, the light passing through the first coupling area is reflected and then directly leaves from the light outlet surface along the horizontal light outlet direction, and the light passing through the second coupling area is reflected and then leaves from the light outlet surface along the horizontal light outlet direction after undergoing once total reflection by the reflecting surface; the coupling structure and the reflecting surface are distributed in axial symmetry with respect to the horizontal light-emitting direction.

2. The light guide of claim 1, wherein the coupling structure further comprises a third coupling region, the light source is located outside the light entrance surface of the optical unit, the emitted light enters the coupling structure through the light entrance surface, and after being reflected by the third coupling region, the light leaves the light exit surface along the horizontal collimation direction after undergoing two total reflections by the reflection surface.

3. The light guide member of claim 1, wherein the first and second coupling regions have parabolic outer surfaces with a focal length of between 0.5 mm and 15mm, a focal point of between 0mm and 50mm directly below the light emitting surface of the light source, and a distance of between 0mm and 20mm from the light incident surface of the light source.

4. The light guide member of claim 2, wherein the outer surface of the third coupling region is parabolic, has a focal length of between 0.5 mm and 15mm, has a focal point located between 0mm and 50mm directly below the light emitting surface of the light source, and has a light emitting surface located between 0mm and 20mm from the light incident surface of the device.

5. A light guide member according to claim 3, wherein the first coupling region and the second coupling region enclose an auxiliary structure surface having a square, rectangular or circular shape.

6. The light guide of claim 4, wherein the first, second, and third coupling regions enclose an auxiliary structure surface having a square, rectangular, or circular shape.

7. The light guide member according to claim 2, wherein the cross section of the reflecting surface is W-like, and each side of the W-like is a straight line.

8. The light guide member according to any one of claims 1 to 7, comprising at least two of the optical units, which are stacked in parallel and staggered from each other or arranged in series in the same plane.

9. An automotive lamp comprising a light guide member, a light source and a PCB board corresponding to said light guide member, a holder for holding said light guide member, a lamp housing, characterized in that said light guide member is any one of claims 1 to 7.