An LED headlight module for electric vehicles with enhanced low beam brightness and uniform light spot

Abstract

An LED headlight module for electric vehicles with enhanced low beam brightness and uniform light spot, comprising a PCB board and a lens assembly provided on one side of the PCB board. The PCB board is provided with low beam lamp beads, high beam lamp beads, and low beam brightness enhancement lamp beads. The lens assembly includes a small lens and a large lens. The small lens is formed with optical surface one, optical surface two, and optical surface three. There is a corresponding positional relationship between optical surface one, optical surface two, optical surface three and the low beam lamp beads, high beam lamp beads, and low beam brightness enhancement lamp beads. On the basis of adding low beam brightness enhancement lamp beads to the LED headlight module for electric vehicles, the optical surfaces of the small lens are adjusted to make the light spot in the low beam state more uniform, the overall light spot shows a gradient decrease, and there is no obvious drop. Not only does the overall brightness hardly change during the switching process between high and low beams, but also the light spot in the low beam state is more uniform, providing better guarantee for safe night riding. The high and low beams of this LED headlight module for electric vehicles also meet the specification requirements.

Description

Technical Field

[0001] The present invention relates to an LED headlight module for electric vehicles with enhanced low beam brightness and uniform light spot. Background Art

[0002] In the structure of a conventional LED headlight module for two-wheeled electric vehicles, a low beam lamp bead is provided on a PCB board, and a high beam lamp bead is provided on each side of the low beam lamp bead. In the low beam state, the low beam lamp bead is lit. In the high beam state, the low beam lamp bead and the high beam lamp beads are lit simultaneously. Due to the different numbers of lit lamp beads in the low and high beam states, there is a relatively obvious change in the ambient brightness during the low and high beam switching process at night, causing certain discomfort to the rider and affecting driving safety.

[0003] In order to keep the ambient brightness basically unchanged during the low and high beam switching process at night, the applicant thought of adding low beam brightening lamp beads on the PCB board. The low beam brightening lamp beads are arranged above the high beam lamp beads. In this way, in the low beam state, the low beam lamp bead and the low beam brightening lamp beads are lit. In the high beam state, the low beam lamp bead and the high beam lamp beads are lit, ensuring that the ambient brightness remains basically unchanged during the low and high beam switching process, making full use of the original heat dissipation conditions of the PCB board at the same time, and also not requiring adjustment of the optical performance of the lens. Through the configuration of the low beam brightening lamp beads, the lighting effect in the low beam state is improved, and the low and high beam switching is more natural. For this reason, the applicant applied for a patent for this solution, with the application number 2024218472665 and the name "An LED headlight module with greatly enhanced low beam brightness".

[0004] However, the low beam brightening lamp beads are arranged above the high beam lamp beads. Without changing the optical surface of the lens, the light rays of the low beam brightening lamp beads are mainly concentrated in the middle position of the cut-off line after being refracted by the lens, as Figure 10 shown. It can be seen that the brightness of the brightening area is significantly higher than other positions; while the overall light spot of the light pattern is not uniform, there is still parallax, and some consumers find it difficult to accept. Summary of the Invention

[0005] Aiming at the deficiencies in the above problems, the present invention provides an LED headlight module for electric vehicles with enhanced low beam brightness and uniform light spot.

[0006] To achieve the above object, the present invention provides an LED headlight module for electric vehicles with enhanced low beam brightness and uniform light spot, including a PCB board and a lens assembly provided on one side of the PCB board. The PCB board is provided with a low beam lamp bead, a high beam lamp bead, and a low beam brightening lamp bead. The lens assembly includes a small lens and a large lens. The small lens is formed with an optical surface one, an optical surface two, and an optical surface three. There is a corresponding positional relationship between the optical surface one, the optical surface two, the optical surface three and the low beam lamp bead, the high beam lamp bead, the low beam brightening lamp bead.

[0007] In the low beam state, the low beam lamp beads and the low beam brightening lamp beads are lit. The light of the low beam lamp beads forms a light spot through the first optical surface and the large lens, and the light of the low beam brightening lamp beads forms a light spot through the third optical surface and the large lens.

[0008] In the high beam state, the low beam lamp beads and the high beam lamp beads are lit. The light of the low beam lamp beads forms a light spot through the first optical surface and the large lens, and the light of the high beam lamp beads forms a light spot through the second optical surface and the large lens.

[0009] Furthermore, the small lens is directly fixedly connected to the PCB board through a fastener. The lens assembly further includes a lens bracket, the large lens is disposed on the lens bracket, and the lens bracket is fixedly connected to the PCB board through a fastener.

[0010] Furthermore, the low beam lamp beads are arranged in the middle of the PCB board. There are two high beam lamp beads and two low beam brightening lamp beads, which are symmetrically arranged on both sides of the low beam lamp beads, and the low beam brightening lamp beads are arranged outside the high beam lamp beads.

[0011] The beneficial effects of the present invention compared with the prior art are as follows:

[0012] On the basis of adding low beam brightening lamp beads in the LED headlight module for electric vehicles, the optical surface of the small lens is adjusted, so that the light spot in the low beam state is more uniform, the overall light spot shows a gradient decrease, and there is no obvious drop. Not only does the overall brightness hardly change during the switching process between high and low beams; at the same time, the light spot in the low beam state is more uniform, providing more guarantee for safe night riding; at the same time, the high and low beams of this LED headlight module for electric vehicles both meet the specification requirements of GB19152-2016 Class C Primary. In the brightening state, the low beam brightness is nearly three times higher than that of the traditional solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional view of the LED headlight module for electric vehicles with low beam brightening and uniform light spot;

[0014] Figure 2 It is an exploded view of the LED headlight module for electric vehicles with low beam brightening and uniform light spot;

[0015] Figure 3 It is a light pattern diagram of the low beam state of the LED headlight module for electric vehicles with low beam brightening and uniform light spot;

[0016] Figure 4 It is for Figure 3 the corresponding brightness schematic diagram;

[0017] Figure 5The roadside effect diagram of the low beam state of the LED headlight module for electric vehicles with enhanced low beam brightness and uniform light spot;

[0018] Figure 6 For Figure 5 The corresponding bird's-eye view;

[0019] Figure 7 For Figure 5 The corresponding driving perspective view;

[0020] Figure 8 The light pattern diagram of the high beam state of the LED headlight module for electric vehicles with enhanced low beam brightness and uniform light spot;

[0021] Figure 9 For Figure 8 The corresponding brightness schematic diagram;

[0022] Figure 10 The light pattern diagram of the low beam state of the LED headlight module with greatly enhanced low beam brightness;

[0023] Figure 11 The low beam test data diagram of the LED headlight module with greatly enhanced low beam brightness;

[0024] Figure 12 For Figure 11 The corresponding test data;

[0025] Figure 13 The low beam test data diagram of the LED headlight module for electric vehicles with enhanced low beam brightness and uniform light spot;

[0026] Figure 14 For Figure 13 The corresponding test data;

[0027] Figure 15 The high beam test data diagram of the LED headlight module for electric vehicles with enhanced low beam brightness and uniform light spot;

[0028] Figure 16 For Figure 15 The corresponding test data.

[0029] In the figure: 1. PCB board; 2. Low beam lamp beads; 3. High beam lamp beads; 4. Low beam enhancement lamp beads; 5. Lens assembly; 51. Small lens; 511. Optical surface one; 512. Optical surface two; 513. Optical surface three; 52. Lens bracket; 53. Large lens. Specific implementation mode

[0030] Such as Figure 1 , Figure 2As shown in the figure, an LED headlight module for electric vehicles with enhanced low beam brightness and uniform light spot includes a PCB board 1 and a lens assembly 5 provided on one side of the PCB board 1. The PCB board 1 is provided with low beam lamp beads 2, high beam lamp beads 3, and low beam brightness enhancement lamp beads 4. The lens assembly 5 includes a small lens 51 and a large lens 53. The small lens 51 is formed with an optical surface 511, an optical surface 512, and an optical surface 513. There is a corresponding positional relationship between the optical surface 511, the optical surface 512, the optical surface 513 and the low beam lamp beads 2, the high beam lamp beads 3, and the low beam brightness enhancement lamp beads 4;

[0031] The small lens 51 is directly fixedly connected to the PCB board 1 through fasteners. The lens assembly 5 further includes a lens bracket 52. The large lens 53 is disposed on the lens bracket 52. The lens bracket 52 is fixedly connected to the PCB board 1 through fasteners; The low beam lamp beads 2 are provided in the middle of the PCB board 1. There are two high beam lamp beads 3 and two low beam brightness enhancement lamp beads 4, which are symmetrically arranged on both sides of the low beam lamp beads 2, and the low beam brightness enhancement lamp beads 4 are arranged outside the high beam lamp beads 3;

[0032] In the low beam state, the low beam lamp beads 2 and the low beam brightness enhancement lamp beads 4 are lit. The light of the low beam lamp beads 2 forms a light spot through the optical surface 511 and the large lens 53. The light of the low beam brightness enhancement lamp beads 4 forms a light spot through the optical surface 513 and the large lens 53;

[0033] In the high beam state, the low beam lamp beads 2 and the high beam lamp beads 3 are lit. The light of the low beam lamp beads 2 forms a light spot through the optical surface 511 and the large lens 53. The light of the high beam lamp beads 3 forms a light spot through the optical surface 512 and the large lens 53.

[0034] On the basis of adding low beam brightness enhancement lamp beads in the LED headlight module for electric vehicles, the optical surface of the small lens is adjusted to make the light spot in the low beam state more uniform. Not only does the overall brightness hardly change during the switching process between high and low beams; at the same time, the light spot in the low beam state is more uniform, the overall light spot shows a gradient decrease, and there is no obvious drop, which provides better guarantee for safe night riding; at the same time, the high and low beams of this LED headlight module for electric vehicles both meet the specification requirements of GB19152-2016 Class C Primary. In the enhanced brightness state, the low beam brightness is nearly three times higher than the traditional solution.

[0035] During specific use, for the convenience of understanding the present invention, it is described in combination with the accompanying drawings;

[0036] Figure 3 It is the light pattern on the screen 10 meters in front of the lamp. The X-axis is the horizontal coordinate axis, the Y-axis is the vertical coordinate axis, the scale unit is millimeter, and the coordinate origin is the center position of the lens assembly 5;

[0037] Figure 4It shows the brightness distribution and width on a screen 10 meters in front of the lamp. The origin of the coordinate system is the center position of the lens assembly 5. H represents the horizontal direction, V represents the vertical direction, and the scale unit is degree (i.e., the amplitude value of the light diffusion irradiation). In the figure, the maximum amplitude values of the lamp irradiation on the left and right sides are each 15 degrees, that is, the lamp can diffusely irradiate approximately 30 degrees in the horizontal direction; the maximum amplitude value of the lamp irradiation downward is 10 degrees, that is, the light of the lamp can form an approximate 10-degree depression angle in the vertical direction; in the figure, the brightness gradually weakens from the central red area to the circumferential blue area;

[0038] Figure 5 Among them, the installation height of the lamp is 0.8 meters, showing the road surface irradiation situation when looking forward from the driver's perspective;

[0039] Figure 6 Among them, the perspective is a bird's-eye view, that is, the road surface irradiation situation observed from above. The X-axis is the distance in front of the vehicle lamp, and the Y-axis is the left and right distance of the vehicle lamp (positive for left, negative for right), with the unit of meter, which can reflect the light paving situation of the lamp;

[0040] Figure 7 Among them, the installation height of the lamp is 0.8 meters, showing the road surface irradiation situation when looking forward from the driver's perspective. This figure can reflect the brightness distribution of the road surface and indicates that the brightest point is 30.9 cd / m². The X-axis is the horizontal coordinate with 0 being the center of the lamp, and the Y-axis is the vertical coordinate with 0 representing the position where the light hits the ground;

[0041] Figure 8 It shows the light pattern on a screen 10 meters in front of the lamp in the high beam state. The X-axis is the horizontal coordinate axis, the Y-axis is the vertical coordinate axis, the scale unit is millimeter, and the origin of the coordinate system is the center position of the lens assembly 5;

[0042] Figure 9 It shows the brightness distribution and width distribution on a screen 10 meters in front of the lamp in the high beam state. H represents the horizontal direction, V represents the vertical direction, the scale unit is degree, and the origin of the coordinate system is the center position of the lens assembly 5, Figure 9 The meaning of the unit "degree" in Figure 4 is the same as that in

[0043] Figure 10 It shows the light pattern on a screen 10 meters in front of the lamp. The X-axis is the horizontal coordinate axis, the Y-axis is the vertical coordinate axis, the scale unit is millimeter, and the origin of the coordinate system is the center position of the lens assembly 5;

[0044] is the same as Figure 7 ; Figure 11 、 Figure 13 、 Figure 15 Among them, the X-axis is the horizontal coordinate with 0 being the center of the lamp, and the Y-axis is the vertical coordinate with 0 representing the position where the light hits the ground (the horizontal position at the same height as the lamp, used to measure the up and down orientation of the light irradiation). In addition Figure 11 、13 , the brightness value coordinates and brightness value of the brightest point are increased by more than 15;

[0045] Viewing Figure 12 It can be seen that at this time, it meets the requirements of GB19152-2016 Class C low beam. However, from the brightness contour lines, it can be seen that the horizontally distributed contour lines are relatively dense, the brightness changes rapidly, and it is not uniform enough;

[0046] Viewing Figure 14 It can be seen that at this time, it meets the requirements of GB19152-2016 Class C low beam;

[0047] Viewing Figure 16 It can be seen that at this time, it meets the requirements of GB19152-2016 Class C high beam.

[0048] Comparing Figure 3 with Figure 10 , Figure 10 is the light pattern diagram of the low beam state of the LED headlight module with greatly increased low beam brightness. Since no adjustment is made to the optical surface of the small lens, the light rays of the low beam brightening lamp beads are mainly concentrated in the middle position of the cut-off line between light and dark after being refracted by the lens, that is, Figure 10 the local light spot at the middle position is relatively dazzling, while the brightness around the local light spot is still insufficient; in Figure 3 , due to the refraction of the light rays of the low beam brightening lamp beads by the optical surface 3513 of the small lens, the light rays of the light brightening lamp beads are more evenly superimposed on the light pattern diagram of the low beam lamp beads. The overall light spot shows a gradient decrease, and there is no obvious drop. The overall brightness is high and the visual effect is better.

[0049] Comparing Figure 11 with Figure 13 , Figure 11 is the low beam test data diagram of the LED headlight module with greatly increased low beam brightness, Figure 13 is the low beam test data diagram of the electric vehicle LED headlight module with increased low beam brightness and uniform light spot. It can be seen that Figure 11 the brightness contour lines in are densely concentrated, Figure 13 the brightness contour lines in are relatively gentle, that is, the low beam light spot of the improved electric vehicle LED headlight module with increased low beam brightness and uniform light spot is more uniform.

[0050] Figure 15 is the high beam test data diagram of the electric vehicle LED headlight module with increased low beam brightness and uniform light spot. The low and high beams of this electric vehicle LED headlight module both meet the specification requirements of GB19152-2016 Class C Primary.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An LED headlight module for electric vehicles with brightened low beam and uniform light spot, characterized in that: The invention comprises a PCB board (1) and a lens assembly (5) arranged on one side of the PCB board (1); the PCB board (1) is provided with a low-beam lamp bead (2), a high-beam lamp bead (3), and a low-beam brightening lamp bead (4); the lens assembly (5) comprises a small lens (51) and a large lens (53); an optical surface 1 (511), an optical surface 2 (512), and an optical surface 3 (513) are formed on the small lens (51); a corresponding positional relationship exists between the optical surface 1 (511), the optical surface 2 (512), and the optical surface 3 (513) and the low-beam lamp bead (2), the high-beam lamp bead (3), and the low-beam brightening lamp bead (4); The low-beam lamp bead (2) is arranged in the middle of the PCB board (1), the high-beam lamp bead (3) and the low-beam brightening lamp bead (4) are both provided in two pieces and are symmetrically arranged on both sides of the low-beam lamp bead (2), and the low-beam brightening lamp bead (4) is arranged outside the high-beam lamp bead (3); In the low-beam state, the low-beam lamp bead (2) and the low-beam brightening lamp bead (4) are lit, the light of the low-beam lamp bead (2) passes through the optical surface one (511) and the large lens (53) to form a light spot, and the light of the low-beam brightening lamp bead (4) passes through the optical surface three (513) and the large lens (53) to form a light spot; In the high-beam state, the low-beam lamp bead (2) and the high-beam lamp bead (3) are lit, the light of the low-beam lamp bead (2) passes through the optical surface 1 (511) and the large lens (53) to form a light spot, and the light of the high-beam lamp bead (3) passes through the optical surface 2 (512) and the large lens (53) to form a light spot.

2. The LED headlight module for electric vehicles with enhanced low beam and uniform light spot according to claim 1, characterized in that: The small lens (51) is directly fixed to the PCB board (1) via a fastener, the lens assembly (5) further comprises a lens bracket (52), the large lens (53) is arranged on the lens bracket (52), and the lens bracket (52) is fixed to the PCB board (1) via a fastener.

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