CN203980074U - A kind of optical texture of automobile LED high beam - Google Patents

Abstract

The utility model discloses an optical structure of an automobile LED high beam lamp, which comprises an annular COB packaged LED, an aluminum metal reflector, and a beam splitting collimation lens. The aluminum metal reflector is in the shape of a trumpet, and the aluminum metal reflector The small-diameter end is clamped on the annular COB packaged LED, and the beam-splitting collimating lens is connected to the large-diameter end of the aluminum metal reflector. The beam-splitting collimating lens is composed of multiple prism rings, and the multiple prism rings are connected from Starting from the large diameter end of the aluminum metal reflector, until the end of the prism ring reaches the maximum diameter, the beam splitting collimator lens completely reflects the light at different angles in each prism ring in the form of split beams, so as to realize the splitting of each split beam All are projected to the specified lighting area, and the light energy of the utility model is utilized to the greatest extent.

Description

An optical structure of an automobile LED high beam

technical field

The utility model relates to an automobile high beam lamp, in particular to an optical structure of an automobile LED high beam lamp.

Background technique

Semiconductor light-emitting diodes have the advantages of small size, long life, light weight, simple structure, high power conversion efficiency, energy saving and environmental protection, high brightness, good stability, etc., and are widely used in the field of lighting. As the number of lumens produced per watt increases, it is possible for LEDs to be applied to automotive lighting.

At present, the light sources of automobile high beams mainly use halogen lamps and xenon lamps, and halogen lamps and xenon lamps will inevitably be replaced by solid light sources due to lifespan and energy consumption problems. As an emerging energy-saving and environmentally friendly solid light source, LED is the darling of the lighting field, but it also has its own problems. For example, technical problems such as high heat dissipation requirements and difficult optical design have always plagued the application of LEDs to automotive headlights. A certain number of LED lamp beads are generally used in ordinary LED lamps, or LEDs with larger chip-on-board packages (COB) are used. If such a large-area light-emitting LED is used to design the headlight optical system, the traditional parabolic reflector design idea is almost impossible to realize. Therefore, people began to consider using multiple optical systems to collimate each LED lamp bead separately, and some people directly increased the power of the LED to greatly increase the lumens of the LED to realize the high beam lighting of the car. Although these methods achieve the purpose of replacing incandescent lamps with LEDs, they neither overcome the shortcomings of LEDs with large light-emitting areas, nor give full play to the advantages of LED light controllability. Therefore, through fine optical system design, you can Greatly improve the photoelectric performance of the LED high beam.

Utility model content

In order to overcome the shortcomings and deficiencies of the above-mentioned prior art, the utility model provides an optical structure of an automobile LED high beam.

The utility model adopts the following technical solutions:

An optical structure of an automotive LED high-beam lamp, comprising a ring-shaped COB-packaged LED, an aluminum metal reflector, and a beam splitting collimating lens, the aluminum metal reflector is in the shape of a trumpet, and the small-diameter end of the aluminum metal reflector is stuck on the On the ring-shaped COB packaged LED, the beam splitting collimating lens is connected to the large-diameter end of the aluminum metal reflector.

The aluminum metal reflector is coated with a dielectric anti-reflection film, and the dielectric anti-reflection film includes four layers of films, and the four layers of films are MgF2-ZnS-MgF2-ZnS films in turn.

The cone angle corresponding to the aluminum metal reflector is 45 degrees.

The beam splitting and collimating lens is composed of multiple prism rings, and the multiple prism rings start from the large-diameter end of the aluminum metal reflector until the prism ring reaches the maximum diameter and ends.

The beam splitting and collimating lens is made of acrylic material with a light transmittance of 91%.

The ring line width of the LED in the ring-shaped COB package is less than or equal to 2mm.

In the four-layer film, the optical thickness of each layer is a quarter of the optical center wavelength.

The LED in the annular COB package is specifically welded on the aluminum substrate with a plurality of LED chips in the shape of a ring.

The radius of the LED in the annular COB package is equal to the radius of the small diameter end of the aluminum metal reflector.

The aluminum substrate is square, and its side length is equal to the maximum diameter of the prism ring.

The beneficial effects of the utility model:

(1) The utility model reflects the light of -90 to 45 degrees LED to the direction of 90-45 degrees, so that the light that is not easy to achieve total reflection can realize total reflection, which is conducive to the full utilization of light energy;

(2) The utility model coats 4 layers of dielectric films on the aluminum metal reflector of the lamp, and the reflectivity is raised to a limit level close to 100%, which not only improves the utilization rate of energy, but also protects the metal surface from corrosion;

(3) The specially designed light beam splitting and collimation mechanism of the utility model adopts the method of beam splitting and total reflection to make the light emitted by the LED effectively projected into the specified lighting area, and the incident light and the outgoing light on the prism ring and the interface The normals are all at small angles, so the amount of light color separation is very small and the illumination distribution is very uniform.

Description of drawings

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

Fig. 2 is the structural diagram of the annular LED of the COB package of the present utility model;

Fig. 3 is a schematic diagram of the ring LED light emitting principle of the COB package of the present invention;

Fig. 4 is the prism ring structure of the present utility model;

Shown in the figure: 1-ring COB packaged LED; 2-aluminum metal reflector, 3-beam splitting collimating lens, 4-aluminum substrate, 5-LED ring, 6-LED chip, 7-total reflection surface, 8 -Equivalent light source, 10-prism ring reflecting hypotenuse, 11-prism ring incident straight side.

Detailed ways

The utility model will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Example 1

As shown in Figure 1, a kind of optical structure of automobile LED high beam, comprises the LED1 of annular COB package, aluminum metal reflector 2, beam-splitting collimating lens 3, and described aluminum metal reflector 2 is horn shape, and described The small-diameter end of the aluminum metal reflector 2 is clamped inside the ring-shaped COB package LED1, and the beam-splitting collimating lens 3 is connected to the large-diameter end of the aluminum metal reflector 2, and the beam-splitting collimating lens 3 is composed of a plurality of prism rings. The arrangement sequence of the plurality of prism rings is starting from the large-diameter end of the aluminum metal reflector 2 until the diameter of the prism ring is equal to the length of the LED aluminum substrate, and the aluminum substrate 4 is square.

As shown in Figure 2, the ring-shaped COB package LED is to weld a plurality of LED chips 6 on the aluminum substrate 4 in the shape of a ring to form an LED ring 5. The radius of the ring in this embodiment is 10mm, and the width of the ring is is 2mm. COB packaged automotive LEDs have high chip packaging density and good heat dissipation. There is no need to add an additional light angle control mechanism during the LED packaging process to avoid unnecessary loss of light energy. In addition, the color rendering efficiency of the ring-shaped COB-packaged LED lamp in this embodiment exceeds 85% of the white LED, so as to meet the requirements of road lighting.

The aluminum metal reflector 2 is specifically in the shape of a trumpet, and is a conical surface that expands and expands at an angle of 45 degrees along the inner side of the LED ring. The rate is about 91.6%.

After the aluminum metal reflector 2 is coated with a layer of dielectric anti-reflection film, the reflectivity is about 99%. The dielectric anti-reflection film includes four layers of thin films, namely MgF2-ZnS-MgF2-ZnS thin films. Among them, the refractive index of MgF2 is 1.38, that of ZnS is 2.35, and the optical thickness of each layer of the medium is a quarter of the central wavelength of 550nm.

The beam-splitting collimating lens 3 is specifically composed of a plurality of prism rings, which extend from the large-diameter end of the aluminum metal reflector and end at the maximum diameter of the beam-splitting collimating lens. The large-diameter end of the metal reflector is connected, and the maximum diameter of the beam-splitting collimating lens is determined by the specific size of the vehicle lamp. In this embodiment, the diameter is 100mm for calculation.

Divide the light emitted by the LED chip on the plane according to the angle. If the upward direction is defined as 90 degrees, the downward direction is -90 degrees; for the convenience of representation, the LED chip 6 is protruded on the aluminum substrate 4, as shown in the figure 3.

Among them, the light in the direction of -90 degrees to -45 degrees is first reflected by the aluminum metal reflector to the aluminum substrate, then reflected by the aluminum substrate back to the aluminum metal reflector, and finally reflected on the prism ring of the collimator lens, that is, after 3 After the second reflection, the original light from -90° to -45° becomes light from 90° to 45°, and the reflection is mainly between the inner side of the LED ring and the aluminum metal reflector;

The light from -45° to 0° will be reflected once by the aluminum metal reflector and the aluminum substrate, and will become the light from 45° to 90°, which will be reflected between the aluminum substrate and the aluminum metal reflector outside the LED ring;

0° to 45°, once reflected by the aluminum metal reflector, it becomes light from 90° to 45°;

The light from 45° to 90° passes through the total reflection surface of the beam splitting collimating lens and is projected to the lighting area in front of the lamp, as shown in Figure 1.

The beam-splitting collimator lens 3 is made of acrylic material with a transmittance of 91%. It directly and totally reflects each sub-beam to an illumination area whose spot radius is 2.25 meters outside 25 meters. The angle should be 10.29 degrees, and this angle is composed of two parts, one is the light cone angle formed by the effective light source 8 to the total reflection surface 7; the other part is the angle formed by the light cone sweeping across the width of the total reflection surface, Therefore, how to determine the distance between the prism ring and the ring-shaped COB package LED ring, as shown in Figure 4, Table 1 specifically includes the angle of incident light, the angle and length of the incident straight side, the angle of the prism ring reflecting the hypotenuse and the equivalent light source 8 The distance position to determine the prism ring. Since each parameter is a relational function, for example, the distance from the light source to the prism ring is determined by reflecting the angle of the hypotenuse 10 of the prism ring, and then the incident light cone is determined, and then the length of the incident straight side 11 of the prism ring is determined, and then the angle of the emitting hypotenuse is calculated to form A function loop. Therefore, all the parameters of the prism ring in the beam-splitting collimator lens cannot be directly obtained through a simple function, and the values in Table 1 are approximate values through numerical calculation.

Table 1

serial number Equivalent light source size Light source to prism ring distance angle of incidence Incident Straight Side Length reflective hypotenuse angle 1 2.12 40 176.38 5.07 43.19 2 2.33 35.24 169.51 4.03 39.76 3 2.49 31.18 163.49 3.03 36.75 4 2.60 27.64 158.3 2.32 34.15 5 2.68 24.79 153.88 1.75 31.94 6 2.73 22.51 150.19 1.31 30.10 7 2.77 20.78 147.2 0.96 28.6 8 2.79 19.35 144.81 0.72 27.43 9 2.80 18.30 143.07 0.49 26.54 10 2.81 17.36 141.79 0.32 25.9 11 2.83 135 22.5

In the actual design project, considering the difficulty of processing and the problem of precision, when the calculation of the length of the incident straight side is less than 0.3mm, it is executed as 0.3mm. So when the data is less than 0.3, it will not be listed anymore, just press 0.3 to execute it.

Wherein the equivalent light source is the equivalent luminescent light source combined by the LED chip and its mirror image, as shown in Figure 4; the distance from the light source to the prism ring refers to the distance from the center of the equivalent light source 8 to the center of the incident side of the prism ring; Angle refers to the angle formed by the incident sideline of the prism ring and the horizontal plane; the length of the incident straight side refers to the width of the light passing through the incident sideline of the prism ring; the reflective hypotenuse angle refers to the angle formed by the reflected sideline of the prism ring and the horizontal plane.

The beam splitting and collimating lens is composed of these prism rings. The maximum diameter of the lens is determined by the application structure. Here, if it is applied to the car headlight, the diameter is about 100mm.

Example 2

This embodiment is the same as Embodiment 1 except for the following features.

The ring radius of the annular COB packaged LED in this embodiment is 8mm, and the radius of the maximum aperture of the beam splitting and collimating lens is about 80mm.

When the length of the straight side of the incident light is less than 0.2mm, the length of the straight side of each prism ring is 0.2mm. The specific values of each parameter are shown in Table 2.

Table 2

After the light incident straight side length is less than 0.2mm, the straight side length of each prism ring shall be 0.2mm.

The above-mentioned embodiment is the preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the described embodiment, and any other changes, modifications, modifications made without departing from the spirit and principle of the present utility model Substitution, combination, and simplification should all be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (10)

1. the optical texture of an automobile LED high beam, it is characterized in that, the LED, aluminum metal reflector, the beam splitting collimation lens that comprise annular COB encapsulation, described aluminum metal reflector is horn shape, described aluminum metal reflector small-caliber end is stuck on annular COB packaged LED, and described beam splitting collimation lens is connected with aluminum metal reflector heavy caliber end.

2. a kind of optical texture of automobile LED high beam according to claim 1, is characterized in that, described aluminum metal reflector plating medium increases anti-film, and described medium increases anti-film and comprises four-level membrane, and described four-level membrane is followed successively by MgF2-ZnS-MgF2-ZnS film.

3. the optical texture of a kind of automobile LED high beam according to claim 1, is characterized in that, the cone angle that described aluminum metal reflector is corresponding is 45 degree.

4. the optical texture of a kind of automobile LED high beam according to claim 1, it is characterized in that, described beam splitting collimation lens consists of a plurality of prism rings, and described a plurality of prism rings, from aluminum metal reflector heavy caliber end, finish until prism rings reaches maximum gauge.

5. the optical texture of a kind of automobile LED high beam according to claim 1, is characterized in that, described beam splitting collimation lens is that acrylic material is made, and light transmittance is 91%.

6. the optical texture of a kind of automobile LED high beam according to claim 1, is characterized in that, the loop wire width of the LED of described annular COB encapsulation is less than or equal to 2mm.

7. the optical texture of a kind of automobile LED high beam according to claim 2, is characterized in that, described four-level membrane, and each layer of optical thickness is 1/4th of optical centre wavelength.

8. the optical texture of a kind of automobile LED high beam according to claim 1, is characterized in that, the LED of described annular COB encapsulation is specifically welded on a plurality of LED chips on aluminium base with toroidal.

9. the optical texture of a kind of automobile LED high beam according to claim 8, is characterized in that, the radius of the LED of described annular COB encapsulation equates with the radius of aluminum metal reflector small-caliber end.

10. the optical texture of a kind of automobile LED high beam according to claim 8, is characterized in that, described aluminium base is square, and its length of side equates with prism rings maximum gauge.