Two-piece car lamp projection lens

Abstract

The utility model discloses a two-piece type car lamp projection lens, which comprises a first lens with positive focal power, a second lens with positive focal power and an LED light source which are sequentially arranged from an image side to an object side along an optical axis direction, and light rays emitted by the LED light source sequentially pass through the second lens and the first lens and then are emitted out; the image side surface of the first lens is an S1 surface, the object side surface of the first lens is an S2 surface, the image side surface of the second lens is an S3 surface, and the object side surface of the second lens is an S4 surface; abbe numbers Vd of the first lens and the second lens meet the condition that Vd is greater than or equal to 45; the S1 surface and the S2 surface are convex surfaces, the S3 surface is a convex surface, the S4 surface is a concave surface, and the S2 surface is provided with a diaphragm. The utility model provides a two-piece type automobile lamp projection lens which is high in light source utilization rate, good in imaging effect and compact in structure, and meanwhile, the two-piece type automobile lamp projection lens is favorable for flat appearance design of an automobile lamp.

Description

Technical Field

[0001] The utility model relates to a two-piece vehicle lamp projection lens. Background Art

[0002] At present, with the advancement of technologies such as intelligent driving and new energy vehicles, cars have gradually evolved from people's means of transportation to more intelligent development. The rate of night driving has also gradually increased due to the accelerated pace of human life. As the "eyes" of night driving, headlights play a vital role in safe driving. The emergence of ADB headlights allows car lights to not only take into account lighting, but also play a good role in safety. Nowadays, pixelated car lights have become the direction of intelligent development of car lights.

[0003] Compared with traditional headlight optics, projection lenses have better image quality, can achieve high relative illumination and uniform brightness, and have high tolerance to large ambient temperature differences inside the lamp. Traditional solutions usually use a full glass structure, and due to material processing limitations, the glass is generally a spherical mirror. In order to optimize the aberration caused by lens imaging, the lens needs to use more glass lenses, which makes the entire lens larger and heavier, while the reserved space for headlights inside the car is limited, and it goes against the development trend of miniaturization and lightweighting. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a two-piece headlight projection lens, which has a high light source utilization rate, good imaging effect, and a relatively compact structure, and is also conducive to the flattened appearance design of the automobile headlight shape.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A two-piece vehicle light projection lens, comprising a first lens with positive optical power, a second lens with positive optical power and an LED light source, which are sequentially arranged from the image side to the object side along the optical axis, wherein the light emitted by the LED light source sequentially passes through the second lens and the first lens and then is emitted;

[0007] The image side surface of the first lens is an S1 surface, the object side surface of the first lens is an S2 surface, the image side surface of the second lens is an S3 surface, and the object side surface of the second lens is an S4 surface;

[0008] The Abbe numbers Vd of the first lens and the second lens both satisfy: Vd≥45;

[0009] The S1 surface and the S2 surface are both convex surfaces, the S3 surface is a convex surface, the S4 surface is a concave surface, and an aperture is provided on the S2 surface.

[0010] Furthermore, the refractive index Nd of the first lens and the second lens both satisfy: Nd≥1.4.

[0011] Furthermore, the first lens is made of plastic, and the second lens is made of glass.

[0012] Furthermore, the optical back focus of the vehicle light projection lens is greater than 2.5 mm.

[0013] Furthermore, the aperture coefficient F / # of the vehicle lamp projection lens is ≤0.7.

[0014] Furthermore, the light source incident angle θ of the vehicle lamp projection lens is greater than 45°.

[0015] Furthermore, the optical distortion of the vehicle lamp projection lens is less than 5%.

[0016] Furthermore, the effective focal length EFL of the headlight projection lens satisfies the following conditions:

[0017] 20mm<EFL<40mm.

[0018] Furthermore, the total lens length TTL of the headlight projection lens satisfies the following conditions:

[0019] 45mm<TTL<100mm.

[0020] Furthermore, the half field of view HFOV of the headlight projection lens satisfies the following conditions:

[0021] 15°<HFOV<20°.

[0022] By adopting the above technical solution, the utility model has the following beneficial effects:

[0023] (1) The lens of the present invention uses an aspherical surface to correct aberrations, thereby improving imaging resolution and greatly improving the imaging quality of the optical structure.

[0024] (2) The utility model is designed with only two lenses, has a compact structure, relatively low manufacturing cost, and is easy to assemble and adjust.

[0025] (3) The aperture of the system of the utility model is arranged after the first lens, which is more conducive to the design of a small opening and a flat opening.

[0026] (4) The utility model has a high light source utilization rate, a large aperture, and an aperture coefficient <0.7.

[0027] (5) The plastic and glass materials used in the lens can still maintain a clear projection effect under the conditions of -40℃ ~ 85℃, and have better stability when used in automotive lighting products. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of a two-piece headlight projection lens of the utility model;

[0029] Figure 2 This is a color difference diagram of the first embodiment of the present utility model;

[0030] Figure 3 This is a distortion diagram of the first embodiment of the present utility model;

[0031] Figure 4 This is the MTF curve diagram of the first embodiment of the present utility model;

[0032] Figure 5 This is a color difference diagram of the second embodiment of the present utility model;

[0033] Figure 6 This is a distortion diagram of the second embodiment of the present utility model;

[0034] Figure 7 This is the MTF curve diagram of the second embodiment of the present utility model. DETAILED DESCRIPTION

[0035] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0036] like Figure 1 As shown, this embodiment provides a two-piece vehicle lamp projection lens, which comprises a first lens (1) with positive optical power, a second lens (2) with positive optical power and an LED light source (3) arranged in sequence from the image side to the object side along the optical axis, and the light emitted by the LED light source (3) passes through the second lens (2) and the first lens (1) in sequence and then is emitted. The design using only two lenses is compact in structure, relatively low in manufacturing cost, and convenient in assembly and adjustment.

[0037] The image side surface of the first lens (1) is the S1 surface, the object side surface of the first lens (1) is the S2 surface, the image side surface of the second lens (2) is the S3 surface, and the object side surface of the second lens (2) is the S4 surface.

[0038] The Abbe numbers Vd of the first lens (1) and the second lens (2) both satisfy: Vd≥45.

[0039] The refractive index Nd of the first lens (1) and the second lens (2) both satisfy: Nd≥1.4.

[0040] The S1 and S2 surfaces are both convex, the S3 surface is convex, the S4 surface is concave, and the S2 surface is provided with an aperture, which is located on the entire S2 surface. The two lenses use aspherical surfaces to correct aberrations, thereby improving imaging resolution and greatly improving the imaging quality of the optical structure.

[0041] like Figure 1 As shown, the number of pixels of the LED light source (3) of this embodiment is greater than 15,000, and the LED light source (3) is MicroLED or Mini LED.

[0042] like Figure 1 As shown, the first lens (1) of this embodiment is made of plastic material, and the second lens (2) is made of glass material. The lens is made of plastic material and glass material, and can still maintain a clear projection effect under the condition of -40℃~85℃, and has better stability when used in car lamp products.

[0043] like Figure 1 As shown, the optical back focus of the headlight projection lens of this embodiment is greater than 2.5 mm, the aperture coefficient F / # of the headlight projection lens is ≤0.7, the light source incident angle θ of the headlight projection lens is greater than 45, and the optical distortion of the headlight projection lens is less than 5%.

[0044] like Figure 1 As shown, the effective focal length EFL of the headlight projection lens of this embodiment satisfies the following conditions:

[0045] 20mm<EFL<40mm.

[0046] like Figure 1 As shown, the total lens length TTL of the headlight projection lens of this embodiment meets the following conditions:

[0047] 45mm<TTL<100mm.

[0048] like Figure 1 As shown, the half field of view HFOV of the headlight projection lens of this embodiment satisfies the following conditions:

[0049] 15°<HFOV<20°.

[0050] Embodiment 1

[0051] The design parameters of the vehicle lamp projection lens are shown in Table 1. In this embodiment, the total length of the lens TTL=55 cm, the aperture coefficient F / #=0.67, and the effective focal length EFL=26.82.

[0052] Table 1

[0053] surface Surface classification Radius of curvature Center thickness Refractive index(Nd) Abbe number (Vd) Diameter(mm) Image plane Spherical infinity infinity S1 Aspheric 30.0 18.0 1.49 55.4 44 S2 Aspheric -100 19.4 37 S3 Spherical 17.9 4 1.80 46.5 29 S4 Spherical 66.4 2.6 22 S5(object plane) Spherical infinity 17.6

[0054] like Figure 2 The color difference diagram is shown as Figure 3 The optical distortion shown is less than 3%. Figure 4 Shown is the MTF curve graph.

[0055] Embodiment 2

[0056] The design parameters of the vehicle light projection lens are as shown in Table 2. In this embodiment, the total length of the optical lens TTL=54mm, the aperture coefficient F / #=0.67, the effective focal length EFL=27.1mm, the half field of view HFOV=19°, the optical back focus is greater than 5mm, and the lens resolution MTF>60%@6.25lp / mm.

[0057] Table 2

[0058] surface Surface classification Radius of curvature Center thickness Refractive index(Nd) Abbe number (Vd) Diameter(mm) Image plane Spherical infinity infinity S1 Aspheric 30.8 18.2 1.49 55.4 44 S2 Aspheric -97.7 19.6 39 S3 Spherical 18.3 13.8 1.80 46.5 29 S4 Spherical 66.8 2.9 24 S5(object plane) Spherical infinity 19

[0059] like Figure 5 The color difference diagram is shown, and it can be seen that the color difference is small. Figure 6 The optical distortion shown is less than 3%. Figure 7 Shown is the MTF curve graph.

[0060] According to the graphical results of the above two embodiments, it can be concluded that the headlight projection lens has good image resolution and the glass has good stability, so that the temperature drift phenomenon caused by temperature changes on the lens can be reduced in the headlight projection.

[0061] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-piece vehicle light projection lens, characterized in that: It comprises a first lens (1) with positive optical power, a second lens (2) with positive optical power and an LED light source (3) which are arranged in sequence from the image side to the object side along the optical axis, wherein the light emitted by the LED light source (3) passes through the second lens (2) and the first lens (1) in sequence and then is emitted; The image side surface of the first lens (1) is the S1 surface, the object side surface of the first lens (1) is the S2 surface, the image side surface of the second lens (2) is the S3 surface, and the object side surface of the second lens (2) is the S4 surface; The Abbe numbers Vd of the first lens (1) and the second lens (2) both satisfy: Vd≥45; The S1 surface and the S2 surface are both convex surfaces, the S3 surface is a convex surface, the S4 surface is a concave surface, and an aperture is provided on the S2 surface.

2. The two-piece vehicle light projection lens according to claim 1, characterized in that: The refractive index Nd of the first lens (1) and the second lens (2) both satisfy: Nd≥1.

4.

3. The two-piece vehicle light projection lens according to claim 1, characterized in that: The first lens (1) is made of plastic material, and the second lens (2) is made of glass material.

4. The two-piece vehicle light projection lens according to claim 1, characterized in that: The optical back focus of the vehicle lamp projection lens is greater than 2.5 mm.

5. The two-piece vehicle light projection lens according to claim 1, characterized in that: The aperture coefficient F / # of the vehicle lamp projection lens is ≤0.

7.

6. The two-piece vehicle lamp projection lens according to claim 1, characterized in that: The light source incident angle θ of the vehicle lamp projection lens is greater than 45.

7. The two-piece vehicle lamp projection lens according to claim 1, characterized in that: The optical distortion of the vehicle lamp projection lens is less than 5%.

8. The two-piece vehicle lamp projection lens according to claim 1, characterized in that: The effective focal length EFL of the headlight projection lens meets the following conditions: 20mm<EFL<40mm.

9. The two-piece vehicle lamp projection lens according to claim 1, characterized in that: The total lens length TTL of the headlight projection lens meets the following conditions: 45mm<TTL<100mm.

10. The two-piece vehicle lamp projection lens according to claim 1, characterized in that: The half field of view HFOV of the headlight projection lens satisfies the following conditions: 15°<HFOV<20°.

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