CN201803258U - A car LED dipped beam - Google Patents

Abstract

The utility model relates to an LED (light-emitting diode) dipped headlight of an automobile. The whole set of optical system consists of two similar optical structures, wherein the second optical structure is formed by mirroring the first optical structure left and right and rotating the first optical structure for 15 degrees. Each optical structure comprises an LED light source (1), a fuse (2), a conducting plate (3), a reflector cup (4) and a matched mirror (5). Three upper and lower LED light sources (1a), (1b) and (1c) are respectively connected with the fuse in series and then connected with the fuse in parallel. The reflector cup (4) is a free-form surface, the matched mirror is connected by a plane lens (5a) and a Fresnel lens (5b), the light rays of the LED light sources above the two optical structures are ejected out via the reflector cup and the plane lens part of the matched mirror, a light and shade cut-off line is generated on a matched screen, and the light ray of the lower LED light source is ejected out via the Fresnel lens part of the matched mirror to meet the passing light requirement specified in the standard. The structure is easy to process and manufacture, and the cost is reduced.

Description

A car LED dipped beam

technical field

The utility model relates to the technical field of automobile lighting, in particular to an automobile LED low beam lamp. the

Background technique

Compared with traditional light sources, LED (Light Emitting Diode) has the advantages of long life, reliability and durability, small size, low energy consumption, fast response, and flexible design. LEDs have been widely used in interior lighting devices and exterior signaling devices, and with the development of white LED technology, the luminous flux of a single LED will continue to increase, and light-emitting diodes have become a new competitive solid light source in the 21st century. Due to the flexible design and control of the LED, the light distribution of the LED light source can be carried out to achieve the light type required by the designer. Therefore, choosing LED light source as the low beam light source of the car is more flexible and more effective than other light sources in optical design, and it has become an inevitable trend to replace traditional light sources for headlights. the

Relevant regulations stipulate that the light distribution of the headlights should make the low beam have sufficient illumination and not dazzle. The light distribution performance shall meet the following requirements: measured on the vertical light distribution screen passing the HV point 25m in front of the reference center of the headlight, on the light distribution screen, the low beam shall produce an obvious cut-off line of light and shade, and its horizontal part shall be at the center of the v-v line. The left side and the right side are slanted lines 15° up to the horizontal line, or 45° slanted lines up to 25cm vertical distance from the horizontal line and turn to the horizontal fold line. And the illuminance value of key points is specified on the light distribution screen. At present, there are many schemes for the optical design of LED headlights to meet the requirements, but most of them now adopt the method of dividing the light distribution area into multiple (more than three) partially overlapping areas for light distribution, and the light distribution area Most of the shapes are defined as rectangles or approximate rectangles, and the optical system is complex, which makes fabrication and processing difficult and increases processing costs. the

Contents of the invention

In order to solve the above-mentioned technical problems, the utility model provides an automobile LED low beam lamp. the

The utility model solves the above technical problems through the following technical solutions:

A low-beam light using LEDs, consisting of two similar optical structures, the second optical structure is a left-right mirror image of the first optical structure, and rotated 15 degrees to form; each optical structure includes an LED light source, a fuse, a conductive plate , reflective cup, light distribution mirror, the reflective cup is surrounded by a shell, the reflective cup is divided into upper and lower parts by a conductive plate, and three upper and lower LED light sources are used, which makes the optical system simple. the

The reflective cup is a free-form surface, and the light distribution mirror is connected by a plane lens and a Fresnel lens. The upper LED light source and the lower two LED light sources are all behind the internal rear of the reflective cup. The incident light of the LED light source is respectively reflected to the plane lens and the Fresnel lens part of the light distribution mirror and then exits. the

The reflective cup reflects the light emitted by the LED light source above to the flat lens of the light distribution mirror and then exits, forming a part of the cut-off line specified in the regulations on the light distribution screen. the

The light emitted by the LED light source below is respectively reflected by the reflector to the Fresnel lens part of the light distribution mirror, and then exits, which meets the standard and has no obvious illuminance jump in the horizontal direction. the

The first optical structure produces a horizontal cut-off line, and the second optical structure produces a cut-off line inclined at 15 degrees. the

In each optical structure, three LEDs are respectively connected in series with the fuse and then connected in parallel, and the circuit parts of the two optical structures are connected in parallel. the

Because the optical system of light distribution is simple, it can not only solve the problem of LED light distribution as low beam, but also help save costs, and is suitable for large-scale promotion and use of automotive LED low beam. the

Description of drawings

Figure 1 is the illuminance distribution diagram of the headlight according to the right-hand traffic rules according to the standard, and the xy coordinate system is established in the diagram;

Figure 2 is the illuminance distribution on the light distribution screen using only the first optical structure, and the oblique line indicates the main area illuminated by it;

Figure 3 is the illuminance distribution on the light distribution screen using only the second optical structure, and the oblique line indicates the main area illuminated by it;

Figure 4 is the illuminance distribution on the light distribution screen using two optical structures at the same time;

Fig. 5 is the circuit principle diagram of single optical system of the present utility model;

Fig. 6 is the front view of the first optical structure;

Fig. 7 is A-A sectional view among the figure;

Fig. 8 is a schematic diagram of the whole set of optical system adopted by the utility model. the

Detailed ways

Describe specific implementation below in conjunction with example. the

Two sets of high-power LEDs are used, each set of three LEDs, the LED model is LXMW-PWN1-0100, each optical structure forms a semicircular light spot, the center of which is near the HV point, and the radius is 4.5 meters. the

Figure 2 is the illuminance distribution on the light distribution screen using only the first optical structure, the oblique line indicates the main area illuminated by it, the coordinates of the center of the circle are (0, 50), and the resulting cut-off line is y=0 (x< 0). the

Figure 3 is the illuminance distribution on the light distribution screen using only the second optical structure, the oblique line indicates the main area illuminated by it, the coordinates of the center of the circle are (0, 50), and the resulting cut-off line is y=x·tg15° (x>0). the

Fig. 4 is the illumination area formed on the light distribution screen by using two optical structures at the same time. the

In FIG. 6 , an automobile LED low beam lamp, each optical system includes an LED light source 1 , a fuse 2 , a conductive plate 3 , a reflector 4 , and a light distribution mirror 5 . The reflective cup forms a housing, the reflective cup 4 is a free-form surface, the light distribution mirror 5 is connected by a plane lens 5a and a Fresnel lens 5b, an LED light source 1a above and two LED light sources 1b, 1c below All are behind the interior of the reflector 4. The reflector 4 reflects the incident light from the upper and lower LED light sources 1a, 1b, and 1c to the plane lens 5a and Fresnel lens 5b of the light distribution mirror 5 respectively, and then exits. the

In Figure 5, the connection mode of the circuit in a single optical structure is that the upper and lower three LED light sources are respectively connected in series with the fuse and then connected in parallel. Even if one LED is short-circuited, the other LEDs still work normally. the

In Figure 8, the entire optical system adopts two structures similar to those in Figure 6. The second optical structure and light distribution element are left and right mirror images of the first optical structure and light distribution element, and rotated 15 degrees to form, and the two optical structures The circuits between the structures are connected in parallel. The light from the upper LED light source 1a of each optical system passes through the reflector 4 and the plane lens 5a of the light distribution mirror 5, and produces an obvious cut-off line on the light distribution screen; the lower LED light source 1b, 1c of each optical structure After the light passes through the Fresnel lens 5b part of the light distribution mirror 5, the low-beam light type on the light distribution screen meets the illuminance requirements of the national standard for each area and each test point, and the light distribution area has no obvious jump in the horizontal direction. Change. the

The light pattern produced by the dipped beam of the car on the light distribution screen meets the illuminance requirements of the national standard "GB4599-1994 Light Distribution Performance of Automobile Headlamps" for each area and each test point, and the light distribution area has no obvious differences in the horizontal direction. Jump. the

The above-mentioned embodiments only illustrate the principles and effects of the present utility model, as well as some embodiments. For those of ordinary skill in the art, some modifications can be made without departing from the inventive concept of the present utility model. and improvements, these all belong to the protection scope of the present utility model. the

Claims (3)

1. vehicle LED dipped headlight is characterized in that: forms by two similar optical textures, and second left and right sides mirror image that optical texture is first optical texture, and rotate 15 degree and form; Each optical texture comprises led light source (1), fuse (2), conductive plate (3), reflector (4), lens (5), reflector (4) surrounds housing, reflector (4) is divided into two parts up and down by conductive plate (3), adopts three LEDs light sources (1a, 1b, 1c) up and down.

2. a kind of vehicle LED dipped headlight according to claim 1, it is characterized in that: reflector (4) is a free form surface, lens (5) is to be formed by connecting by a planar lens (5a) and Fresnel lens (5b), and a LEDs light source (1a) of top and below two LEDs light sources (1b, 1c) are all at the rear, inside of reflector (4).

3. a kind of vehicle LED dipped headlight according to claim 1 is characterized in that: in each optical texture, three LEDs are connected in parallel respectively again with fuse (2a, 2b, 2c), and the circuit part of two optical textures adopts mode in parallel to connect.

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