A low beam lamp for vehicle

Abstract

The present invention relates to a vehicle low beam lamp, the vehicle low beam lamp comprises a lamp bead and a lens, the aspect ratio of the lens is greater than 2:1, the lens comprises an incident surface and an exit surface, wherein the incident surface is a plane, the exit surface is a convex surface, the lamp bead is arranged above the focal plane of the lens, so that the light emitted by the lamp bead is refracted through the lens to form a light spot with a cut-off line. The present invention realizes a light spot that complies with low beam regulations through a combination of a reasonable arrangement of lamp beads and an optically designed lens, and has a novel appearance, a simple structure, a reduced volume, cost savings, and a wide range of applications.

Description

Technical Field

[0001] The invention belongs to the field of vehicle lamps, and in particular relates to a vehicle low-beam lamp with small size and wide applicability. Background Art

[0002] In order to meet the requirements of low beam lights for vehicles, the low beam light source must be able to produce a light-to-dark cutoff line. Existing low beam light sources use a combination of reflective cups and lenses to distribute light so that low beam LEDs can produce a light-to-dark cutoff line. However, the lenses are generally circular, elliptical or square plano-convex lenses to achieve a focusing effect, and then the light-to-dark cutoff line is formed through the reflection design of the reflective cup. However, since the reflective cup does not focus the light well enough, the stripe light spot of the light-to-dark cutoff line is not clear enough, which means that the effect of the dark cutoff line is not obvious enough.

[0003] In addition, since the lens of the existing vehicle low beam lamp is a circular, elliptical or square plano-convex lens, its volume is relatively large and the material cost is high. Summary of the invention

[0004] The present invention aims to provide a low beam lamp for a vehicle to solve the above problems. To this end, the specific technical solutions adopted by the present invention are as follows:

[0005] A vehicle low beam lamp, comprising a lamp bead and a lens, wherein the aspect ratio of the lens is greater than 2:1, and the lens comprises an incident surface and an exit surface, wherein the incident surface is a plane, and the exit surface is a convex surface, and the lamp bead is arranged above the focal plane of the lens, so that the light emitted by the lamp bead is refracted through the lens to form a light spot with a cut-off line.

[0006] Further, the exit surface is represented by the following expression, which is an xy polynomial surface equation, where x, y, and z are coordinates of the surface, the origin o is the intersection of the incident surface and the optical axis of the lens, the x-axis is the length direction of the lens, the y-axis is the width direction of the lens, and the z-axis is the thickness direction of the lens:

[0007] z=p10*x+p01*y+p20*x^2+p11*x*y+p02*y^2+p30*x^3+p21*x^2*y+p12*x*y^ 2+p03*y^3+p40*x^4+p31*x^3*y+p22*x^2*y^2+p13*x*y^3+p04*y^4+p50*x^5 +p41*x^4*y+p32*x^3*y^2+p23*x^2*y^3+p14*x*y^4+p05*y^5+p60*x^6+p51 *x^5*y^1+p42*x^4*y^2+p33*x^3*y^3+p24*x^2*y^4+p15*x^1*y^5+p06*y^6;

[0008] Among them, the value ranges of each coefficient are as follows: p01 = [-0.29964, 0.19964], p02 = [-0.23166, 0.13166], p03 = [0.205e-05, 2.205e-05], p04 = [1.633e-05, 3.633e-05], p05 = [-2.018e-05, 0.018e-05], p06 = [-3.747e-07, -0.746e-07], p10 = [-8.833e-09, 8.825e-09], p11=[-3.157e-09,3.029e-09], p12=[-3.531e-10,3.74e-10], p13=[-9.461e-11,9.886e-11], p14=[-4.271e-12,4.194e-12], p15=[-8.998e-13,8.742e-13], p20=[-1.02917,0.02917], p21=[-4.445e-05 ,-2.445e-05], p22=[-3.483e-05,-1.483e-05], p23=[-3.594e-06,-0.594e-06), p24=[-2.218e-07,-0.218 e-07], p30=[-7.994e-11,6.855e-11], p31=[-1.974e-11,2.117e-11], p32=[-9.456e-13,8.433e-13], p33=[ -2.293e-13,2.024e-13], p40=[-9.63e-06,-6.63e-06], p41=[-4.222e-07,-1.222e-07], p42=[-8.642e-08 ,-4.642e-08], p50=[-1.286e-13, 1.313e-13], p51=[-3.826e-14, 3.592e-14], p60=[-3.61e-08, 0.61e-08].

[0009] Preferably, the values ​​of the coefficients of the polynomial surface equation are: p01 = -0.09964, p02 = -0.03166, p03 = 1.205e-05, p04 = 2.633e-05, p05 = -1.018e-05, p06 = -2.746e-07, p10 = -4.379e-12, p11 = -6.429e-11, p12 = 1.047e-11, p13 = 2.126e-12, p14 = -3.837e-14, p15 = -1.281e-14, p20 = -0.02917 , p21=-3.445e-05, p22=-2.483e-05, p23=-1.594e-06, p24=-1.218e-07, p30=-6.959e-13, p31=7.185e-13, p32=-5.111e-1 4. p33=-1.34e-14, p40=-8.63e-06, p41=-2.222e-07, p42=-6.642e-08, p50=1.369e-15, p51=-1.172e-15, p60=-1.61e-08.

[0010] Furthermore, the distance between the lamp bead and the lens is 5 to 20 mm. Preferably, the distance between the lamp bead and the lens is 15 mm.

[0011] Furthermore, the refractive index of the lens is 1.1-2.0.

[0012] Furthermore, the lens is made of PMMA.

[0013] Furthermore, the number of the lamp beads is 1 or 2.

[0014] Furthermore, the lamp beads are LEDs.

[0015] The present invention adopts the above technical solution, which has the beneficial effect that the present invention realizes a light spot that complies with the low beam regulations through a reasonable arrangement of lamp beads and a combination of optically designed lenses, and has a novel appearance, a simple structure, a reduced volume, cost savings, and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0017] Figure 1is a stereoscopic diagram of a lens of a low-beam lamp for a vehicle of the present invention;

[0018] Figure 2 yes Figure 1 A side view of the lens shown;

[0019] Figure 3 is a light path diagram of a low beam lamp for a vehicle of the present invention;

[0020] Figure 4 is a schematic diagram of a light spot formed by a low beam lamp for a vehicle of the present invention;

[0021] Figure 5 and 6 It is an arrangement diagram of lamp beads of the vehicle low beam lamp of the present invention. DETAILED DESCRIPTION

[0022] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0023] like Figure 1-6 As shown, a vehicle low beam lamp may include a lens 1 and a lamp bead 2. It should be clear that the volume of the lamp bead 2 is much smaller than that of the lens 1, so the lamp bead 2 can be approximately regarded as a point light source. The lens 1 is a plano-convex lens similar to the shape of a mouse, and its aspect ratio is greater than 2:1. The volume of the lens 1 is relatively small compared to existing circular or square lenses, so it can save materials and reduce manufacturing costs. The lens 1 may include an incident surface 11 and an exit surface 12, wherein the incident surface 11 is a plane, and the exit surface 12 is a convex surface. The lamp bead 2 is arranged above the focal plane of the lens 1, so that the light emitted by the lamp bead 2 is refracted through the lens 1 to form a light spot with a cut-off line, which complies with the low beam regulations. The light path diagram and the formed light spot are respectively shown as follows. Figure 3 and 4 The vehicle low beam lamp of the present invention can be used for motor vehicles such as automobiles or friction vehicles.

[0024] The exit surface 12 of the lens 1 can be fitted using an xy polynomial surface equation. First, define an xyz coordinate system, define the intersection of the incident surface 12 and the optical axis A of the lens as the origin o, define the length direction of the lens 1 as the x-axis, define the width direction of the lens 1 as the y-axis, and define the thickness direction of the lens 1 (i.e., the direction of the optical axis A) as the z-axis. The polynomial surface equation is as follows:

[0025] z=p10*x+p01*y+p20*x^2+p11*x*y+p02*y^2+p30*x^3+p21*x^2*y+p12*x*y^ 2+p03*y^3+p40*x^4+p31*x^3*y+p22*x^2*y^2+p13*x*y^3+p04*y^4+p50*x^5 +p41*x^4*y+p32*x^3*y^2+p23*x^2*y^3+p14*x*y^4+p05*y^5+p60*x^6+p51 *x^5*y^1+p42*x^4*y^2+p33*x^3*y^3+p24*x^2*y^4+p15*x^1*y^5+p06*y^6. Among them, the value ranges of the coefficients of the polynomial are as follows: p01 = [-0.29964, 0.19964], p02 = [-0.23166, 0.13166], p03 = [0.205e-05, 2.205e-05], p04 = [1.633e-05, 3.633e-05], p05 = [-2.018e-05, 0.018e-05], p06 = [-3.747e-07, -0.746e-07], p10 = [-8.833e- 09,8.825e-09], p11=[-3.157e-09,3.029e-09], p12=[-3.531e-10,3.74e-10], p13=[-9.461e-11,9.886e-11 ], p14=[-4.271e-12,4.194e-12], p15=[-8.998e-13,8.742e-13], p20=[-1.02917,0.02917], p21=[-4.445e- 05,-2.445e-05], p22=[-3.483e-05,-1.483e-05], p23=[-3.594e-06,-0.594e-06), p24=[-2.218e-07,-0.21 8e-07], p30=[-7.994e-11, 6.855e-11], p31=[-1.974e-11, 2.117e-11], p32=[-9.456e-13, 8.433e-13], p33= [-2.293e-13,2.024e-13], p40=[-9.63e-06,-6.63e-06], p41=[-4.222e-07,-1.222e-07], p42=[-8.642e-08 ,-4.642e-08], p50=[-1.286e-13, 1.313e-13], p51=[-3.826e-14, 3.592e-14], p60=[-3.61e-08, 0.61e-08].Preferably, the values ​​of the coefficients of the polynomial are: p01 = -0.09964, p02 = -0.03166, p03 = 1.205e-05, p04 = 2.633e-05, p05 = -1.018e-05, p06 = -2.746e-07, p10 = -4.379e-12, p11 = -6.429e-11, p12 = 1.047e-11, p13 = 2.126e-12, p14 = -3.837e-14, p15 = -1.281e-14, p20 = -0.02917, p 21=-3.445e-05, p22=-2.483e-05, p23=-1.594e-06, p24=-1.218e-07, p30=-6.959e-13, p31=7.185e-13, p32=-5.111e-14 , p33=-1.34e-14, p40=-8.63e-06, p41=-2.222e-07, p42=-6.642e-08, p50=1.369e-15, p51=-1.172e-15, p60=-1.61e-08.

[0026] The distance between the lamp bead 2 and the lens 1 is generally between 5 and 20 mm. Preferably, the distance between the lamp bead 2 and the lens 1 is 15 mm.

[0027] The lens 1 may be made of a light-transmitting material such as plastic, glass, etc., and its refractive index is between 1.1 and 2.0. Preferably, the lens 1 is made of PMMA.

[0028] The number of lamp beads 2 can be 1 or 2. When the number of lamp beads 2 is 1, the lamp bead 2 is located in the middle of the length of the lens 1, such as Figure 5 When the number of lamp beads 2 is 2, they are located on both sides of the length midline (ie, y-axis) of the lens 1, as shown in FIG. Figure 6 Preferably, the lamp bead 2 is an LED.

[0029] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A low beam lamp for a vehicle, characterized in that: The vehicle low beam lamp comprises a lamp bead and a lens, wherein the aspect ratio of the lens is greater than 2:1, and the lens comprises an incident surface and an exit surface, wherein the incident surface is a plane, and the exit surface is a convex surface, and the lamp bead is arranged at a position slightly above the focal plane of the lens, so that the light emitted by the lamp bead is refracted through the lens to form a light spot with a cut-off line; The exit surface is represented by the following expression, which is an xy polynomial surface equation, where x, y, and z are the coordinates of the surface, the origin o is the intersection of the incident surface and the optical axis of the lens, the x-axis is the length direction of the lens, the y-axis is the width direction of the lens, and the z-axis is the thickness direction of the lens: z=p10*x+p01*y+p20*x^2+p11*x*y+p02*y^2+p30*x^3+p21*x^2*y+p12*x*y^ 2+p03*y^3+p40*x^4+p31*x^3*y+p22*x^2*y^2+p13*x*y^3+p04*y^4+p50*x^5 +p41*x^4*y+p32*x^3*y^2+p23*x^2*y^3+p14*x*y^4+p05*y^5+p60*x^6+p51 *x^5*y^1+p42*x^4*y^2+p33*x^3*y^3+p24*x^2*y^4+p15*x^1*y^5+p06*y^6; Among them, the value ranges of the coefficients of the polynomial are as follows: p01 = [-0.29964, 0.19964], p02 = [-0.23166, 0.13166], p03 = [0.205e-05, 2.205e-05], p04 = [1.633e-05, 3.633e-05], p05 = [-2.018e-05, 0.018e-05], p06 = [-3.747e-07, -0.746e-07], p10 = [-8.833e-09, 8. 825e-09], p11=[-3.157e-09,3.029e-09], p12=[-3.531e-10,3.74e-10], p13=[-9.461e-11,9.886e-11], p14=[ -4.271e-12,4.194e-12], p15=[-8.998e-13,8.742e-13], p20=[-1.02917,0.02917], p21=[-4.445e-05,-2.445e -05], p22=[-3.483e-05,-1.483e-05], p23=[-3.594e-06,-0.594e-06), p24=[-2.218e-07,-0.218e-07], p30=[ -7.994e-11,6.855e-11], p31=[-1.974e-11,2.117e-11], p32=[-9.456e-13,8.433e-13], p33=[-2.293e-13,2.0 24e-13], p40 = [-9.63e-06, -6.63e-06], p41 = [-4.222e-07, -1.222e-07], p42 = [-8.642e-08, -4.642e-08], p50 = [-1.286e-13, 1.313e-13], p51 = [-3.826e-14, 3.592e-14], p60 = [-3.61e-08, 0.61e-08]; the distance between the lamp bead and the lens is 5 to 20 mm.

2. The vehicle low beam lamp according to claim 1, characterized in that: The values ​​of the coefficients of the polynomial are: p01 = -0.09964, p02 = -0.03166, p03 = 1.205e-05, p04 = 2.633e-05, p05 = -1.018e-05, p06 = -2.746e-07, p10 = -4.379e-12, p11 = -6.429e-11, p12 = 1.047e-11, p13 = 2.126e-12, p14 = -3.837e-14, p15 = -1.281e-14, p20 = -0.02917, p21 =-3.445e-05, p22=-2.483e-05, p23=-1.594e-06, p24=-1.218e-07, p30=-6.959e-13, p31=7.185e-13, p32=-5.111e-14 , p33=-1.34e-14, p40=-8.63e-06, p41=-2.222e-07, p42=-6.642e-08, p50=1.369e-15, p51=-1.172e-15, p60=-1.61e-08 。 3. The vehicle low beam lamp according to claim 1, characterized in that: The distance between the lamp bead and the lens is 15 mm.

4. The vehicle low beam lamp according to claim 1, characterized in that: The refractive index of the lens is 1.1-2.

0.

5. The vehicle low beam lamp according to claim 1, characterized in that: The lens is made of PMMA.

6. The vehicle low beam lamp according to claim 1, characterized in that: The number of the lamp beads is 1 or 2.

7. The vehicle low beam lamp according to claim 1, characterized in that: The lamp beads are LEDs.

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