CN109488992B - Light guide and car lamp with same - Google Patents

Abstract

The invention provides a light guide, which comprises a coupling part and a plurality of light guide parts connected with light splitting areas on one side of the coupling part, wherein a light source is arranged at a light inlet surface of the coupling part, and light emitted by the light source is coupled by the coupling part and then enters the light guide parts to lighten the light guide; the light guide parts are arc-shaped and comprise light emergent surfaces, and the light guide parts are sequentially arranged along the light splitting area; the light emitted by the light source forms a first part of light to be incident on the light guide part through the reflection unit, and the light emitted by the light source forms a second part of light to be incident on the light guide part through the reflection unit and the first side wall.

Description

Light guide and car lamp with same

Technical Field

The invention relates to the field of vehicle lamps, in particular to a light guide and a vehicle lamp with the light guide.

Background

At present, the light guide is mostly realized by matching a flexible circuit board with a direct-injection type thick-wall part, the flexible circuit board is high in cost, low in stability and complex in positioning and installation, the direct-injection type thick-wall part is uneven in brightness, and a single LED coverage area is short.

Due to the technological advances, the light output of a single LED is increasing, and the trend of linear diversification of vehicle models is becoming more and more obvious, and a light guide structure capable of uniformly distributing the energy of the LED in a more free streamline area is required.

Disclosure of Invention

In order to overcome the technical defects, the invention aims to provide a light guide and a vehicle lamp with the light guide.

The invention discloses a light guide, which comprises a coupling part and a plurality of light guide parts connected with light splitting areas on one side of the coupling part, wherein a light source is arranged at the light incident surface of the coupling part, light emitted by the light source is incident to the light guide parts after being coupled by the coupling part so as to lighten the light guide,

the coupling part comprises a top surface opposite to the light incident surface, and a first side wall and a second side wall which are arranged between the light incident surface and the top surface, wherein the middle part of the top surface is recessed towards the light incident surface to form at least one reflection unit, and the light splitting area is formed at the coupling connection part of the second side wall and the light guide part;

the light guide parts are arc-shaped and comprise light emergent surfaces, and the light guide parts are sequentially arranged along the light splitting area;

the light emitted by the light source forms a first part of light to be incident on the light guide part through the reflection unit, and the light emitted by the light source forms a second part of light to be incident on the light guide part through the reflection unit and the first side wall.

Preferably, it is characterized in that the first and second parts,

the structure of the coupling part is cylindrical, and the structure of the reflection unit is conical.

Preferably, it is characterized in that the first and second parts,

the height of the reflection unit is equal to the distance from the top point of the reflection unit to the light incident surface.

Preferably, it is characterized in that the first and second parts,

the reflection unit comprises a first total reflection surface facing the light guide part and a second total reflection surface back to the light guide part; the middle part of the first side wall extends outwards to an extension point, and an included angle between the extension point and a first connecting surface and a second connecting surface which are connected with the light incident surface and the top surface is a right angle;

after the light emitted by the light source enters the light incident surface, the light is reflected by the first total reflection surface and the second total reflection surface to form the first part of light and the second part of light, wherein the first part of light is directly emitted to the light splitting area, the first part of light is emitted to the light guide part after being split by the light splitting area, the second part of light is reflected to the first connection surface by the second total reflection surface, is directly emitted to the light splitting area after being reflected by the first connection surface and the second connection surface, and is emitted to the light guide part after being split by the light splitting area.

Preferably, it is characterized in that the first and second parts,

the side wall of the light guide part is provided with a side wall divergence surface, and the first part of light and the second part of light are emitted from the light emitting surface after the light guide part is lightened through multiple reflections of the side wall divergence surface.

Preferably, it is characterized in that the first and second parts,

the light guide part comprises a starting end coupled with the coupling part and a tail end opposite to the starting end;

the starting ends are continuously arranged in the light splitting area, and the light emitting surface is positioned at the tail end;

the light emitting surfaces of the plurality of light guides are located on the same plane.

Preferably, it is characterized in that the first and second parts,

the light emitting surfaces of the light guides are continuously arranged on a horizontal line;

and the adjacent light emitting surfaces after arrangement are coupled and connected, so that the light emitting surfaces form a one-to-one lighting effect.

Preferably, it is characterized in that the first and second parts,

first parts of the light-emitting surfaces of the plurality of light guides are continuously arranged to form a first circular arc; second parts of the light-emitting surfaces of the plurality of light guides are continuously arranged to form a second circular arc; the first arc and the second arc are centrosymmetric;

the adjacent light emitting surfaces after arrangement are in non-coupling connection, and the same gaps are arranged between the light emitting surfaces, so that the light emitting surfaces form an S-shaped lighting effect.

The invention also discloses a car lamp with the light guide.

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

1. the incident light of the light source enters the light guide strip after being uniformly reflected and turned by the total reflection unit. The light is transmitted in the light guide strip in a total reflection manner, and the tail ends of the light guide strip can respectively extend to any space position required by modeling;

2. each light guide is equally divided into a plurality of light guide strips according to angles at the light splitting connection area, the light rays received by each light guide strip are the same, the shapes of the light guide strips are gradually changed from the initial section to the tail end, and the internal total reflection light beams are mixed in all directions;

3. the side wall of the light guide is added with a concave curved surface (side wall divergence surface), and the side wall divergence surface expands the transverse angle of the passing light beam, so that the distribution of the light beam conducted in the light guide strip reaching the tail end is more uniform, and the transverse dark area is reduced;

4. the ends of the light guides may not be connected together, and a discontinuous point-like shaping effect may be achieved.

Drawings

FIG. 1 is a schematic structural diagram in accordance with a preferred embodiment of the present invention;

FIG. 2 is a schematic structural diagram in accordance with a preferred embodiment of the present invention;

fig. 3 is a schematic structural diagram in accordance with a preferred embodiment of the present invention.

Fig. 4 is a schematic structural diagram in accordance with a preferred embodiment of the present invention.

Fig. 5 is a schematic structural diagram in accordance with a preferred embodiment of the present invention.

Fig. 6 is a diagram illustrating a lighting effect according to a preferred embodiment of the present invention.

Fig. 7 is a diagram illustrating a lighting effect according to a preferred embodiment of the present invention.

Reference numerals:

10-coupling part

11-reflection unit

12-spectroscopic ligation region

13-incident surface

14-light emitting surface

15-side wall diverging surface

20-light source

21-first light extraction

22-second light extraction

23-first part of light

24-second portion of light

25-top surface

26-bottom surface

Detailed Description

The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.

Light source 20

In an embodiment of the present invention, thelight source 20 comprises a substrate and at least one LED light source. A conductive circuit layer is arranged on one side of the substrate, and the substrate comprises at least one opening and a plurality of screw holes.

The structure of thelight source 20 includes a three-dimensional structure composed of at least one planar substrate, and specifically, at least one substrate is disposed on one surface of eachlight source 20. In practice, the substrate and thelight source 20 may be integrally formed.

As the substrate, a substrate having a metal base plate, a substrate made of a single-layer or multi-layer insulating plate may be preferably used. When a substrate having a metal bottom plate is used, the bottom plate thereof may be formed of a metal such as aluminum, iron, copper, or the like. The shape and size of the substrate may be determined as appropriate according to the application of the lighting fixture.

Thelight source 20 is a light emitting element, specifically, a light emitting element that generates heat when it emits light, and a representative example thereof is an LED (light emitting diode), but the light emitting element includes, but is not limited to, an LED. When the semiconductor light emitting element is an LED, an SMD type LED, a shell type LED, a COB type LED, or the like can be used. The emission color of a semiconductor light emitting element such as an LED may include white or a color other than white.

Eachlight source 20 is disposed corresponding to each opening and is electrically connected to a power source. Further, the light emitting surface of thelight source 20 is located on the other side of the substrate opposite to the power supply.

Specifically, thelight source 20 may include a bracket, a light emitting portion disposed at the top of the bracket and having a light emitting surface, pins disposed at opposite positions of the bracket, and a power interface disposed at the bottom of the bracket. When thelight source 20 is mounted on the substrate, the bracket is disposed in an opening, the bracket is fixed and supports thelight source 20 on the substrate, and the power interface is electrically connected to the power source, so that thelight source 20 can better protrude from the substrate, thereby preventing light from being blocked, and thelight source 20 can be firmly fixed on the substrate.

Secondly, the distance between thelight sources 20 can be adjusted according to the light-emitting intensity and the heat dissipation of thelight sources 20. Here, the interval between thelight sources 20 is an interval of a symmetry axis between midpoints of light outgoing portions of the twolight sources 20. Alternatively, thelight sources 20 are arranged at different pitches based on thelight sources 20 of different powers. Alternatively, thelight sources 20 can exhibit a linear distribution on the substrate, the power of thelight sources 20 being the same, by the pitch of thelight sources 20, i.e. the pitch between all thelight sources 20 being the same.

In embodiments of the present invention, thelight source 20 may use low cost FR4 in the present system, LEDs are mounted in an array on FR4 board, and the spacing between LEDs may be between 10mm and 300 mm.

Couplingpart 10

Referring to fig. 1 to 5, in an embodiment of the present invention, the light guide includes acoupling portion 10 and at least two or more light guide portions, thecoupling portion 10 is cylindrical, the side surface of thecylindrical coupling portion 10 is configured as a first side wall and a second side wall, the first side wall is configured as a light splitting area (hereinafter, referred to as a light splitting joint area 12), and specifically, the light splittingjoint area 12 is configured to occupy half of the area of the side surface of thecylindrical coupling portion 10. The second side wall extends outwardly to an extension point which forms a first extension plane with thetop surface 25 of thecylindrical coupling part 10 and a second extension plane with the bottom surface of thecylindrical coupling part 10, the first extension plane and the second extension plane forming an angle at the extension point, preferably 90 degrees.

Abottom surface 26 of thecylindrical coupling portion 10 is an incident surface facing thelight source 20. The middle of thetop surface 25 opposite to the bottom surface 26 (light incident surface) is recessed toward the bottom surface 26 (light incident surface) to form areflection unit 11.

Preferably, thereflection unit 11 is conical with the bottom surface 26 (light incident surface) as a base, preferably, thereflection unit 11 is regular conical, the vertex angle of the regular conical is 90 degrees, the vertical distance from the vertex of the regular conical to the bottom surface 26 (light incident surface) is equal to the height of the regular conical, and the center point of the bottom surface of the regular conical may coincide with the center point of thetop surface 25 of the cylindrical coupling part.

Preferably, the extension point and the vertex point lie in the same plane parallel to the bottom surface 26 (light incident surface).

The right-circular cone-shapedreflection unit 11 includes a first total reflection surface and a second total reflection surface, and the bottom surface 26 (light incident surface) includes a first light incident surface and a second light incident surface. The first total reflection surface and the first light incident surface form a first coupling structure, the second total reflection surface, the second light incident surface and the second side wall of thecylindrical coupling portion 10 form a second coupling structure, the first light distribution structure is located on one side of the light distribution system, the second light distribution structure is located on the other side of the light distribution structure, one end of the first coupling structure is adjacent to the second coupling structure, one end of the first coupling structure is coupled with the coupling surface, and the first coupling structure is close to the light guide portion.

Specifically, the first total reflection surface faces the first light incident surface, two ends of the first total reflection surface are respectively connected to the side surface of the first light distribution structure facing the first light incident surface and the coupling surface, the first total reflection surface is connected to the coupling surface and a first connection point, and a first interval is formed between the first connection point and the first light incident surface.

Specifically, two ends of the second total reflection surface are respectively connected to the side surface of the second light distribution structure facing the second light incident surface and the coupling surface, the second total reflection surface is connected to the coupling surface and a second connection point, and a second interval is formed between the second connection point and the second light incident surface;

specifically, the first extending surface is disposed facing the second total reflection surface, one end of the first extending surface and one end of the second extending surface are connected to the extending point at an included angle of 90 degrees, the other end of the first extending surface is connected to a side surface of the second coupling structure facing the second incident surface, and the other end of the second extending surface is connected to the second incident surface.

A light guide part:

the light guide portion may be an integrally formed structure, and includes a starting end and a tail end opposite to the starting end, where the starting end includes at least onelight incident surface 13, and the tail end includes at least onelight emitting surface 14 and a sidewall diverging surface 15 (total reflection surface). The arrangement position of the light guide portions can be set according to the shape of the vehicle lamp, and specifically, each of the light guide portions can be arranged next to each other in the extending direction of the various shapes, the starting end and the end of each of the light guide portions are aligned, the light guide portions are arranged continuously, and the interval between each of the light guide portions can be equal. The side wall diverging surface 15 (total reflection surface) totally reflects the light passing through thelight incident surface 13 of the light guide to form a light beam exiting along the direction of the lightoutgoing surface 14, and the side wall diverging surface 15 (total reflection surface) may be a reflection section formed by arranging a reflection surface on the inner wall of the light guide, or may be a reflection end formed by arranging a reflection coating on the outer wall of the light guide.

Alternatively, in a preferred embodiment of the invention, the light guide part is formed by one or two injection molding using PMMA or PC material.

Alternatively, if the shape is a complicated linear or space point, thecoupling part 10 and the light guide part can be separately processed, thecoupling part 10 can be formed by one-time injection molding, and the light guide part can be separately injection molded and then assembled with thecoupling part 10.

Specifically, each of the light guide portions exhibits a different circular arc shape. Thelight incident surface 13 of the light guide part is coupled to the lightsplitting connection region 12 of thecoupling part 10, alight source 20 is disposed at thelight incident surface 13 of thecoupling part 10, and light emitted from thelight source 20 is coupled by thecoupling part 10 and then enters the light guide part to light the light guide.

Specifically, the light output from thelight source 20 includes afirst light output 21 and a secondlight output 22, wherein thefirst light output 21 forms a first portion of light 23 on the first total reflection surface, the secondlight output 22 forms a second portion of light 24 on the second extension surface after being reflected by the second total reflection surface and reflected by the first extension surface, the first portion oflight 23 and the second portion of light 24 enter the light guide after passing through the lightsplitting connection region 12, and the light guide is lit after being reflected by the sidewall divergent surface 15 (total reflection surface).

Referring to fig. 6-7, which are diagrams illustrating the modeling effect of the light guide according to the first embodiment of the present invention, the light guide includes acoupling portion 10 and a plurality of light guide portions connected to a lightsplitting connection region 12 on one side of thecoupling portion 10, alight source 20 is disposed at alight incident surface 13 of thecoupling portion 10, and thelight source 20 may be alight emitting source 20 such as an LED, a halogen lamp, or a xenon lamp. The light emitted from thelight source 20 is coupled by thecoupling portion 10 and then enters the light guide portion to illuminate the light guide.

Specifically, the light guide portion includes alight incident surface 13 and alight emitting surface 14, and the light guide portions are sequentially arranged along the lightsplitting connection region 12. The light guiding portion may be curved into any possible shape, e.g. in the shape of an arc-bar, as desired.

In addition, the light guide part further includes a plurality of light guide structures arranged along an extending direction of the light guide part, wherein the extending direction is perpendicular to a radial direction of the light guide part. The plurality of light guide structures are configured to output light inside the light guide portion from inside the light guide portion, and a light output side of the light guide portion constitutes alight exit surface 14 of the light guide portion.

Alternatively, the plurality of light guide structures may also be designed to be located on a side of the sidewall surface of the light guide portion opposite to thelight exit surface 14 of the light guide portion. However, this is not essential. Those skilled in the art will understand that the positional relationship between the plurality of light guiding structures on the light guiding tube and thelight emitting surface 14 depends on the structural design of the light guiding portion, i.e. other positional relationships are also possible.

Meanwhile, a side wall of the light guide portion is provided with a side wall divergent surface 15 (total reflection surface), and light emitted by thelight source 20 is emitted from thelight emitting surface 14 after the light guide portion is lightened by multiple reflections of the side wall divergent surface 15 (total reflection surface).

Specifically, thelight emitting surfaces 14 of the light guide portions are continuously arranged on a horizontal line. The adjacentlight emitting surfaces 14 after arrangement are coupled and connected, so that thelight emitting surfaces 14 form a straight line shape, and the light guide presents a straight line-shaped lighting effect.

Further, first portions of the light-emittingsurfaces 14 of the plurality of light guides are continuously arranged in a first arc; second portions of the light-exitingsurfaces 14 of the plurality of light guides are continuously arranged in a second arc; the first arc and the second arc are centrosymmetric; the adjacentlight emitting surfaces 14 after arrangement are not coupled and the same gap is formed between the light emittingsurfaces 14, so that thelight emitting surfaces 14 form an S-shaped lighting effect.

Specifically, the light guide portions are arranged in an axisymmetric manner along a vertical line perpendicular to a horizontal line of thelight exit surface 14, each of the axisymmetric portions has a different arc shape, a certain interval is provided between the axisymmetric portions, the length of each of the axisymmetric portions is different, and each interval has a shape that is wider than it is narrower than it is. The light incident surfaces 13 and the light exit surfaces 14 of the light guide parts are coupled and connected, the light incident surfaces 13 are attached to thecoupling part 10, and the light exit surfaces 14 are located in the same horizontal plane.

The invention also comprises a vehicle lamp with the light guide, which can be one or more of an LED headlight, a taillight and an interior lamp, in particular, the vehicle lamp comprises a set of light guides and a set of light sources. The light guide comprises a coupling part and a plurality of light guide parts, the light source is arranged below the high coupling part, and the plurality of light guide parts are arc-shaped, are coupled with the coupling part and are continuously arranged. After the power supply of the light source is started, the light emitted by the light source is coupled and emitted into the plurality of light guide parts through the coupling part to be lightened, so that the car lamp presents a linear lightening effect.

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 (7)

1. A light guide comprises a coupling part and a plurality of light guide parts connected with a light splitting area on one side of the coupling part, a light source is arranged at the light incident surface of the coupling part, light emitted by the light source is coupled by the coupling part and then enters the light guide parts to light the light guide,

the coupling part is cylindrical in structure and comprises a top surface opposite to the light incident surface, and a first side wall and a second side wall which are arranged between the light incident surface and the top surface, wherein the middle part of the top surface is recessed towards the light incident surface to form at least one reflection unit, and the light splitting area is formed at the coupling connection part of the second side wall and the light guide part;

the reflecting unit is conical and comprises a first total reflecting surface facing the light guide part and a second total reflecting surface back to the light guide part; the middle part of the first side wall extends outwards to an extension point, and an included angle between the extension point and a first connecting surface and a second connecting surface which are connected with the light incident surface and the top surface is a right angle;

the light guide parts are arc-shaped and comprise light emergent surfaces, and the light guide parts are sequentially arranged along the light splitting area;

the light emitted by the light source forms a first part of light to be incident on the light guide part through the reflection unit, the light emitted by the light source forms a second part of light to be incident on the light guide part through the reflection unit and the first side wall,

after the light emitted by the light source enters the light incident surface, the light is reflected by the first total reflection surface and the second total reflection surface to form the first part of light and the second part of light, wherein the first part of light is directly emitted to the light splitting area, the first part of light is emitted to the light guide part after being split by the light splitting area, the second part of light is reflected to the first connection surface by the second total reflection surface, is directly emitted to the light splitting area after being reflected by the first connection surface and the second connection surface, and is emitted to the light guide part after being split by the light splitting area.

2. The light guide according to claim 1,

the height of the reflection unit is equal to the distance from the top point of the reflection unit to the light incident surface.

3. The light guide according to claim 1,

the side wall of the light guide part is provided with a side wall divergence surface, and the first part of light and the second part of light are emitted from the light emitting surface after the light guide part is lightened through multiple reflections of the side wall divergence surface.

4. The light guide according to claim 3,

the light guide part comprises a starting end coupled with the coupling part and a tail end opposite to the starting end;

the starting ends are continuously arranged in the light splitting area, and the light emitting surface is positioned at the tail end;

the light emitting surfaces of the light guide parts are positioned on the same plane.

5. The light guide according to claim 4,

the light emitting surfaces of the light guide parts are continuously arranged on a horizontal line;

and the adjacent light emitting surfaces after arrangement are coupled and connected, so that the light emitting surfaces form a one-to-one lighting effect.

6. The light guide according to claim 4,

first parts of the light emergent surfaces of the light guide parts are continuously arranged to form a first circular arc; second parts of the light emergent surfaces of the light guide parts are continuously arranged to form a second circular arc; the first arc and the second arc are centrosymmetric;

the adjacent light emitting surfaces after arrangement are in non-coupling connection, and the same gaps are arranged between the light emitting surfaces, so that the light emitting surfaces form an S-shaped lighting effect.

7. A vehicle lamp, characterized in that it comprises a light guide according to any one of claims 1 to 6.

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