Aspherical lens capable of improving color fringing and vehicle lamp projection system having the same

Abstract

The application relates to the field of optical projection technology, in particular to a non-spherical lens capable of improving color edges and a vehicle lamp projection system with the same, the vehicle lamp projection system comprising a non-spherical lens capable of improving color edges, a second lens, a third lens and a fourth lens which are sequentially arranged along the optical axis direction, the fourth lens is arranged close to a light source, the non-spherical lens capable of improving color edges and the third lens have positive focal power, and the second lens and the fourth lens have negative focal power, wherein the non-spherical lens capable of improving color edges comprises a mirror body, a spherical surface is arranged on the mirror body, a compression adhesive layer is arranged on the spherical surface of the mirror body, and the side, away from the mirror body, of the compression adhesive layer is arranged as a non-spherical surface. The application adopts a mold pressing method, improves the processing of the spherical glass, reduces the processing difficulty of the non-spherical lens, makes the non-spherical lens achieve the processing effect of the non-spherical surface, thereby improving the color edges and improving the projection effect.

Description

Technical Field

[0001] This application relates to the field of optical projection technology, and more particularly to an aspherical lens that can improve chromatic aberration and a vehicle headlight projection system having the same. Background Technology

[0002] As consumers increasingly demand higher levels of driving safety and comfort, the development of intelligent and autonomous driving technologies has placed higher demands on automotive lighting. Compared to traditional pure illumination headlights, automotive headlights equipped with advanced projection technology and intelligent control systems have received widespread attention. This new type of headlight technology utilizes the latest integrated modular LED matrix light source. This not only reduces the difficulty of semiconductor manufacturing processes but also simplifies system development. The new light source, composed of a high-pixel LED matrix, enables the headlights to have high definition, high brightness, and excellent light distribution. This not only improves nighttime driving safety but also provides drivers with a more comfortable visual experience. Achieving clearer and more uniform illumination requires a precisely designed optical structure.

[0003] Currently, the optical structure of existing pixel projection car lights typically uses an all-glass lens structure. While this structure has a relatively mature manufacturing process and the impact of manufacturing and assembly tolerances on the optical system is minimal, the spherical structure of the glass lens results in significant color fringing in the projection, leading to a poor driving experience and overall inferior projection quality. Utility Model Content

[0004] The technical problem this invention aims to solve is that existing spherical glass projections have large color fringes, resulting in a poor driving experience and poor projection quality.

[0005] Therefore, this utility model provides an aspherical lens that can improve chromatic aberration and a vehicle headlight projection system having the same.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An aspherical lens that can improve chromatic aberration includes,

[0008] A mirror body, wherein a spherical surface is provided on the mirror body;

[0009] An adhesive layer is provided on the spherical surface of the lens body, and the side of the adhesive layer away from the lens body is set as an aspherical surface.

[0010] Furthermore, the adhesive layer is disposed on one or both sides of the mirror body.

[0011] Furthermore, the adhesive layer is applied to the mirror body using an embossing technique.

[0012] Furthermore, the material of the adhesive layer is glue, and the refractive index of the glue is 1.4 to 1.73.

[0013] Furthermore, the refractive index of the mirror is 1.3 to 1.7.

[0014] A vehicle headlight projection system includes an aspherical lens for improving chromatic aberration as described above, as well as a second lens, a third lens, and a fourth lens. Along the optical axis, the aspherical lens for improving chromatic aberration, the second lens, the third lens, and the fourth lens are arranged sequentially. The fourth lens is positioned close to the light source. The aspherical lens for improving chromatic aberration and the third lens have positive optical power, while the second lens and the fourth lens have negative optical power.

[0015] Furthermore, a vignetting stop is provided on the side of the aspherical lens that can improve chromatic aberration facing the fourth lens.

[0016] Furthermore, the aspherical lens that can improve chromatic aberration has an image-side surface S1 on the front and an object-side surface S2 on the rear; the second lens has an image-side surface S4 on the front and an object-side surface S5 on the rear; the third lens has an image-side surface S6 on the front and an object-side surface S7 on the rear; and the fourth lens has an image-side surface S8 on the front and an object-side surface S9 on the rear, wherein surfaces S1, S2, S5, S6, S7, and S8 are all convex surfaces, and surfaces S4 and S9 are concave surfaces.

[0017] The beneficial effect of this utility model is that by using a mold pressing method, the processing of spherical glass is improved, the processing difficulty of aspherical lenses is reduced, and the processing effect of aspherical lenses is achieved, thereby improving the color edge and enhancing the projection effect. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a structural schematic diagram of the vehicle headlight projection system in this utility model.

[0020] Figure 2 This is a schematic diagram of the aspherical lens that can improve the chromatic edge in this utility model.

[0021] Figure 3 This is a projection color difference diagram of the vehicle headlight projection system in this utility model.

[0022] Figure 4 This is the MTF diagram of the projection effect of the vehicle headlight projection system in this utility model.

[0023] Figure 5 This is a distortion diagram of the projection effect of the vehicle headlight projection system in this utility model.

[0024] Figure 6 This is a point diagram illustrating the projection effect of the vehicle headlight projection system in this utility model.

[0025] In the figure: 1. First lens; 11. Lens body; 12. Adhesive layer; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Imprinting mold. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figure 1 As shown, a vehicle headlight projection system includes a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4, wherein the first lens 1 is an aspherical lens that can improve chromatic aberration.

[0030] The first lens 1 and the third lens 3 have positive optical power, and the second lens 2 and the fourth lens 4 have negative optical power. Specifically:

[0031] The fourth lens 4 is positioned close to the object surface S10 (which can be understood as the light source). Along the optical axis, the first lens 1, second lens 2, third lens 3, and fourth lens 4 are arranged sequentially. The side of the fourth lens 4 is designated as the rear side, and the side of the first lens 1 as the front side. The front side of the first lens 1 is the image-side surface S1, and the rear side is the object-side surface S2; the front side of the second lens 2 is the image-side surface S4, and the rear side is the object-side surface S5; the front side of the third lens 3 is the image-side surface S6, and the rear side of the second lens 2 is the object-side surface S7; the front side of the fourth lens 4 is the image-side surface S8, and the rear side of the second lens 2 is the object-side surface S9. Surfaces S1, S2, S5, S6, S7, and S8 are convex surfaces, while surfaces S4 and S9 are concave surfaces. A vignetting stop S3 is provided on surface S2.

[0032] Furthermore, the refractive index of the material used in the first lens 1 is between 1.3 and 1.7, and the Abbe number is between 30 and 60; the refractive index of the material used in the second lens 2 is between 1.6 and 1.9, and the Abbe number is less than 50; the combined focal length of the third lens 3 and the fourth lens 4 is 0.6 < |f34 / EFL| < 1, thus the optical back focal length of the entire vehicle headlight projection system (imaging lens) is greater than 3mm, the aperture coefficient F / # ≤ 0.7, the optical distortion is less than 4%, the effective focal length EFL of the imaging lens satisfies: 20mm < EFL < 40mm; the total length TTL of the imaging lens satisfies: 45mm < TTL < 70mm; and the maximum half field of view HFOV of the imaging lens satisfies the following condition: 10° < HFOV < 15°.

[0033] It should be noted that, as Figure 2 As shown, the first lens 1 includes a lens body 11 and an adhesive layer 12. The side of the lens body 11 facing the fourth lens 4 is spherical (D2). The adhesive layer 12 is disposed on the side of the lens body 11 facing the fourth lens 4. The adhesive layer 12 is an adhesive layer formed by imprinting using existing imprinting technology. The side of the adhesive layer 12 away from the lens body 11 is aspherical (D1). The formula for aspherical (D1) is as follows:

[0034]

[0035] Where z is the sagitta of the non-curved surface (unit: mm), c is the paraxial curvature of the aspherical surface, r is the lens diameter (unit: mm), k is the conic coefficient, and α i For even-order aspherical coefficients, i = 1, 2, 3, 4, 5, 6, 7, 8.

[0036] The adhesive layer 12 uses an adhesive material with a refractive index close to that of the glass lens, such as epoxy resin optical adhesive. The refractive index of the adhesive material is typically 1.4-1.73, and the Abbe number is 40-60. The thickness of the adhesive on the spherical surface D1 of the lens body 11 is typically about 0.1 mm, and the required amount of adhesive needs to be calculated based on the surface shape. Under the action of the imprinting mold 5, a uniform adhesive layer 12 with an aspherical surface D1 can be formed on the surface of the lens body 11. Finally, under UV light irradiation, the thin layer is fixed to the lens body 11, thereby changing the surface shape of the lens body 11 from spherical surface D2 to aspherical surface D1, reducing aberrations, improving imaging effect, and improving chromatic aberration.

[0037] In this embodiment, the structure of the vehicle headlight projection system is shown in Table 1. The total length of the vehicle headlight projection system is 70cm, F / # = 0.7, and the effective focal length (EFL) is 31mm; Figure 3 The vertical axis chromatic aberration diagram shown has a maximum red-blue difference of 45 μm. Figure 4 The MTF curve shown indicates that at MTF@6.25lp / mm>0.3, as... Figure 5 The graphs are distortion and field curvature maps, with maximum distortion <4%. Figure 6 The five smaller images show the projection effect at different object distances (0.00 degrees, 3.00 degrees, 6.00 degrees, 9.00 degrees, and 12.80 degrees). As can be seen from the images, the light spot is highly concentrated, indicating that the lens performance is good and the color fringing effect of the projection is improved.

[0038] Table 1 Structural parameters of the vehicle headlight projection system in this embodiment

[0039]

[0040] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.

Claims

1. An aspherical lens that can improve chromatic aberration, characterized in that, include, A mirror body, wherein a spherical surface is provided on the mirror body; An adhesive layer is provided on the spherical surface of the lens body, and the side of the adhesive layer away from the lens body is set as an aspherical surface.

2. The aspherical lens with improved chromatic aberration according to claim 1, characterized in that, The adhesive layer is applied to one or both sides of the mirror body.

3. The aspherical lens with improved chromatic aberration according to claim 1, characterized in that, The adhesive layer is applied to the mirror body using an embossing technique.

4. The aspherical lens with improved chromatic aberration according to claim 1, characterized in that, The material of the adhesive layer is glue, and the refractive index of the glue is 1.4~1.

73.

5. The aspherical lens with improved chromatic aberration according to claim 1, characterized in that, The refractive index of the mirror is 1.3 to 1.

7.

6. A vehicle headlight projection system, characterized in that, The system includes an aspherical lens for improving chromatic aberration as described in any one of claims 1-5, and a second lens, a third lens, and a fourth lens. Along the optical axis, the aspherical lens for improving chromatic aberration, the second lens, the third lens, and the fourth lens are arranged sequentially, with the fourth lens positioned close to the light source. The aspherical lens for improving chromatic aberration and the third lens have positive optical power, while the second lens and the fourth lens have negative optical power.

7. The vehicle headlight projection system according to claim 6, characterized in that, The aspherical lens that improves chromatic aberration has a vignetting stop on the side facing the fourth lens.

8. The vehicle headlight projection system according to claim 6, characterized in that, The aspherical lens that can improve chromatic aberration has an image-side surface S1 on the front and an object-side surface S2 on the rear; the second lens has an image-side surface S4 on the front and an object-side surface S5 on the rear; the third lens has an image-side surface S6 on the front and an object-side surface S7 on the rear; and the fourth lens has an image-side surface S8 on the front and an object-side surface S9 on the rear, wherein surfaces S1, S2, S5, S6, S7, and S8 are all convex surfaces, and surfaces S4 and S9 are concave surfaces.

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