Optical lens assembly for vehicle lamp

Abstract

The present invention discloses an optical lens group for a vehicle lamp, which includes three lenses. The three lenses are, in sequence from the light source side to the outside, a first lens, a second lens, and a third lens. Let the opening diameter of the first lens be D1, the opening diameter of the second lens be D2, and the opening diameter of the third lens be D3. The focal length of the first lens is f1, the focal length of the second lens is f2, the combined focal length generated by the three lenses is f, and the combined focal length of the first lens and the second lens is f12. The refractive index of the first lens is n1, the refractive index of the second lens is n2, and the refractive index of the third lens is n3. Then the following relational expressions are satisfied: D1 < D2 < D3; 25 ≤ f ≤ 33 mm, 19 mm < f12 < 25 mm, 0.7 < f12 / f < 0.8; n1 ≤ n2 < n3. Compared with the optical structure in the prior art, the present invention adopts a design scheme of three lenses, and through the reasonable ratio of the opening diameters, focal lengths, and refractive indices of the three lenses, a technical breakthrough in high-performance imaging of the lens group is achieved, and at the same time, the total axial length of the optical lens group can also be shortened.

Description

Technical Field

[0001] The invention relates to the field of vehicle lamp lighting, and in particular to an optical lens group for vehicle lamps, which is mainly used for lighting vehicle headlights. Background Art

[0002] With the rapid development of automotive front lighting technology, optical modules that can project multi-zone lighting areas are becoming a hot technology that major automotive lighting manufacturers are competing to research. However, the collimation efficiency of single-lens optical solutions can no longer meet the current design requirements of higher pixels, and multi-lens optical solutions have defects such as large length and diameter, which leads to an increase in the volume of the lamp and cannot achieve the beauty of the vehicle structure. In addition, the current multi-lens solution cannot meet the pixel requirements of more than 100 pixels.

[0003] In order to obtain better imaging quality, the present invention proposes a solution of realizing the imaging function through three lenses. Summary of the invention

[0004] In order to solve the technical problem that the optical solutions in the prior art cannot meet the higher pixel requirements, the present invention provides an optical lens group for a car light, which can not only achieve the requirement of hundreds of pixels, but also has a shorter overall length, thereby reducing the size of the car light and ensuring the beauty of the vehicle body structure.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an optical lens group for a vehicle lamp, comprising three lenses, the three lenses are a first lens, a second lens and a third lens in order from the light source side to the outside; the opening diameter of the first lens is D1, the opening diameter of the second lens is D2, and the opening diameter of the third lens is D3; the focal length of the first lens is f1, the focal length of the second lens is f2, the combined focal length of the three lenses is f, the combined focal length of the first lens and the second lens is f12, the refractive index of the first lens is n1, the refractive index of the second lens is n2, and the refractive index of the third lens is n3, then the following relationship is satisfied:

[0006] D1<D2<D3; 25≤f≤33mm, 19mm <f12<25mm、0.7<f12 / f<0.8;n1≤n2<n3。

[0007] Furthermore, the maximum opening diameter D of the three lenses satisfies the following condition: 40 mm<D<50 mm.

[0008] Furthermore, at least two of the three lenses are aspherical lenses, and the 0.8 <f1 / f2<1.2。

[0009] Furthermore, at least one of the three lenses is a glass aspherical lens with an anti-reflection film.

[0010] Furthermore, at least two of the three lenses have positive refractive power.

[0011] Furthermore, the field of view FOV of the optical lens assembly for the vehicle light meets the following conditions: -23° <FOV<23°。

[0012] Furthermore, the first lens is a plano-convex lens, the light incident surface of the first lens is a plane, the second lens is a hyperbolic lens, and the third lens is a concave-convex lens, the light incident surface of the third lens is a concave surface.

[0013] Furthermore, the first lens is made of optical glass material, and the second lens and the third lens are made of optical glass or high-temperature plastic.

[0014] The beneficial effects of the present invention are:

[0015] (1) Compared with the optical structure in the prior art, the optical lens group for vehicle lights of the present invention adopts a three-lens design. By rationally matching the opening diameters, focal lengths and refractive indices of the three lenses, a technical breakthrough in high-performance imaging of the lens group is achieved. At the same time, the total axial length of the optical lens group can also be shortened.

[0016] (2) The present invention reduces the maximum aperture of the lens, thereby further reducing the overall size while satisfying imaging performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 is a front view of a first embodiment of the optical lens assembly for a vehicle lamp according to the present invention;

[0019] Figure 2 The wavelength of light is 486nm. Figure 1 The schematic diagram of field curvature and distortion after the optical lens assembly for the headlight is shown;

[0020] Figure 3 The wavelengths of 486nm, 588nm and 656nm pass through Figure 1 A schematic diagram of magnification chromatic aberration of an optical lens assembly for a vehicle lamp is shown;

[0021] Figure 4 The wavelengths of 486nm, 588nm and 656nm pass through Figure 1 Schematic diagram of axial chromatic aberration of the optical lens group used for car lights.

[0022] In the figure, 1 is the first lens, 2 is the second lens, and 3 is the third lens. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] An optical lens assembly for a vehicle lamp includes three lenses, which are a first lens 1, a second lens 2, and a third lens 3 from the light source side to the outside. Let the opening diameter of the first lens 1 be D1, the opening diameter of the second lens 2 be D2, and the opening diameter of the third lens 3 be D3; let the focal length of the first lens 1 be f1, the focal length of the second lens 2 be f2, the combined focal length of the three lenses be f, the combined focal length of the first lens 1 and the second lens 2 be f12, the refractive index of the first lens 1 be n1, the refractive index of the second lens 2 be n2, and the refractive index of the third lens 3 be n3, then the following relationship is satisfied:

[0025] D1<D2<D3.

[0026] 25≤f≤33mm, 19mm <f12<25mm、0.7<f12 / f<0.8。

[0027] n1≤n2<n3.

[0028] When the present invention satisfies the above configuration relationship, a technological breakthrough of hundreds of pixels can be achieved, and the total axial length of the optical lens group can also be shortened.

[0029] Figure 1 The first embodiment of the present invention is an optical lens group for a vehicle lamp. The first lens 1 in the embodiment is a plano-convex lens. The light-entering surface of the first lens 1 is a plane surface and the light-emitting surface is a convex surface. The incident light can be evenly dispersed to the light-emitting surface of the first lens 1 through the plane. The second lens 2 is a hyperbolic lens. The light-entering surface and the light-emitting surface of the second lens 2 are both convex surfaces. The angle of the light beam emitted from the first lens 1 is relatively large. The second lens 2 can adjust the angle of the light beam and shape the light beam. The third lens 3 is a concave-convex lens. The light-entering surface of the third lens 3 is a concave surface and the light-emitting surface is a convex surface. The light beam can be emitted approximately horizontally. The first lens 1 is made of optical glass material, and the second lens 2 and the third lens 3 are made of optical glass or high-temperature plastic.

[0030] Preferably, the maximum opening diameter D of the three lenses satisfies the following condition: 40 mm < D < 50 mm. D is the maximum value among D1, D2, and D3. The overall opening size of the lens is small, which meets the design requirements of small size of the headlight-level optical lens.

[0031] Preferably, at least two of the three lenses are aspherical lenses. In this embodiment, the first lens 1, the second lens 2, and the third lens 3 are all aspherical lenses. The focal length of the first lens 1 is f1, and the focal length of the second lens 2 is f2, and 0.8 < f1 / f2 < 1.2. The combination design of the selection of aspherical lenses and the relationship between the focal lengths of the lenses can be used to correct aberrations and correct different parameters in different regions. In a further design, at least one of the three lenses is a glass aspherical lens with an anti-reflection coating. In this embodiment, it is the first lens 1, which is used to achieve a better imaging effect.

[0032] To achieve light focusing, it is usually also necessary to satisfy that at least two of the three lenses have positive refractive power. In this embodiment, the first lens 1 and the second lens 2 are positive refractive power lenses to ensure the imaging effect of positive projection.

[0033] In this embodiment, the field of view FOV of the optical lens group for vehicle lamps satisfies the following condition: -23° < FOV < 23°.

[0034] The following shows the design data of the optical lens group for vehicle lamps according to the first embodiment.

[0035] Table 1 shows the parameter values of the optical lens group for vehicle lamps in the first embodiment.

[0036] Parameters and Conditionals Example F 28.7mm f1 41.1mm f2 38.9mm f3 -1045mm f12 21.78mm f1 / f2 1.05 D1 32mm D2 44.8mm D3 46.4mm n1 1.517 n2 1.534 n3 1.585 T1 26.52mm T2 14.74mm T3 11.98mm T12 1.85mm T23 13.92mm

[0037] Among them,

[0038] f represents the combined focal length of the three lenses;

[0039] f1 represents the focal length of the first lens 1;

[0040] f2 represents the focal length of the second lens 2;

[0041] f3 represents the focal length of the third lens 3;

[0042] f12 represents the combined focal length of the first lens 1 and the second lens 2;

[0043] D1 represents the outer diameter of the first lens 1;

[0044] D2 represents the outer diameter of the first lens 1;

[0045] D3 represents the outer diameter of the first lens 1;

[0046] n1 represents the refractive index of the first lens 1;

[0047] n2 represents the refractive index of the second lens 2;

[0048] n3 represents the refractive index of the third lens 3;

[0049] T1 represents the center thickness of the first lens 1;

[0050] T2 represents the center thickness of the second lens 2;

[0051] T3 represents the central thickness of the third lens 3;

[0052] T12 represents the air space between the first lens 1 and the second lens 2;

[0053] T23 represents an air space between the second lens 2 and the third lens 3 .

[0054] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0055] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An optical lens assembly for a vehicle lamp, Features: The lens group has three lenses, which are, from the light source side to the outside, a first lens (1), a second lens (2) and a third lens (3); The opening diameter of the first lens (1) is D1, the opening diameter of the second lens (2) is D2, and the opening diameter of the third lens (3) is D3; the focal length of the first lens (1) is f1, the focal length of the second lens (2) is f2, the combined focal length of the three lenses is f, the combined focal length of the first lens (1) and the second lens (2) is f12, the refractive index of the first lens (1) is n1, the refractive index of the second lens (2) is n2, and the refractive index of the third lens (3) is n3, then the following relationship is satisfied: D1<D2<D3; 25mm≤f≤33mm, 19mm <f12<25mm、0.7<f12 / f<0.8; n1≤n2<n3; At least two of the three lenses are aspherical lenses, and 0.8 <f1 / f2<1.2; At least two of the three lenses have positive refractive power; The first lens (1) is a plano-convex lens, the light incident surface of the first lens (1) is a plane, the second lens (2) is a hyperbolic lens, the third lens (3) is a concave-convex lens, and the light incident surface of the third lens (3) is a concave surface.

2. The optical lens assembly for a vehicle lamp according to claim 1, Features: The maximum opening diameter D of the three lenses satisfies the following condition: 40 mm<D<50 mm.

3. The optical lens assembly for a vehicle lamp according to claim 1, Features: At least one of the three lenses is a glass aspherical lens with an anti-reflection film.

4. The optical lens assembly for a vehicle lamp according to claim 1, Features: The field of view angle FOV of the optical lens group for the headlight meets the following conditions: -23° <FOV<23°。 5. The optical lens assembly for a vehicle lamp according to claim 1, Features: The first lens (1) is made of optical glass material, and the second lens (2) and the third lens (3) are made of optical glass or high-temperature plastic.

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