High-heat-resistance pixelated car lamp optical structure

Abstract

The utility model relates to the technical field of car lamps, in particular to a high-heat-resistance pixelated car lamp optical structure which comprises a light source, a light guide plate and a light guide plate. The lens group comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power and a fourth lens with positive focal power which are sequentially arranged from the image plane to the object plane in the optical axis direction; wherein the first lens is a plastic lens; the second lens, the third lens and the fourth lens are glass lenses; the system diaphragm is arranged on one side, opposite to the second lens, of the first lens; and the vignetting diaphragm is arranged between the third lens and the fourth lens.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle lamps, in particular to a high heat-resistant pixelated vehicle lamp optical structure. Background Art

[0002] With the development of automotive lighting towards intelligence and pixelation, pixelated vehicle lamps with Micro-LED as the light source have become an important direction in the development of vehicle lamps. The pixelated light source has tiny pixels that emit light independently, and each pixel can adjust the intensity of light emission. After the light source is matched with the optical system, the emitted light pattern becomes a pixelated light pattern, meeting the lighting scenarios of adaptive high and low beams.

[0003] The lenses of such pixelated vehicle lamps require precision-molded molds, and the mold cost is high. In actual situations, different vehicle models have different requirements for the appearance shape of the light outlet of the vehicle lamp. Some require flattening, some require square or circular shapes. If different vehicle lamps are customized separately for different light outlet shape requirements, not only is the production cost high, but also it is not convenient for the orderly management of the production workshop. The factor that determines the shape of the light outlet of the vehicle lamp mainly lies in the optical structure adopted inside it. The optical structure usually includes multiple lenses used in cooperation. In addition, high-temperature scenarios or environments are inevitable during the use of vehicle lamps, and the high-temperature environment will directly affect the service life of the optical structure in the vehicle lamp. For the lenses used in the optical structure itself, its heat resistance is positively correlated with its hardness, but the lens with high hardness has a low degree of freedom in shape design and is difficult to meet the usage requirements for different light outlet shapes.

[0004] In addition, the optical structures adopted in the prior art generally can only meet the usage requirements of adaptive high and low beams with dozens of pixels, and cannot meet the usage requirements of high-resolution adaptive high and low beams based on Micro-LED. Therefore, with the maturity of Micro-LED technology, it is necessary to further optimize the overall structure of the optical system based on high-resolution Micro-LED light sources.

[0005] In summary, for the optical structures adopted in existing vehicle lamps, it is still necessary to further optimize their structures to simultaneously take into account excellent heat resistance, the degree of freedom of the light outlet shape, and the adaptability to high-resolution Micro-LED light sources. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a high heat-resistant pixelated vehicle lamp optical structure to solve the technical problem of optimizing its overall usage performance.

[0007] The high heat-resistant pixelated vehicle lamp optical structure of the utility model is realized as follows:

[0008] A high heat-resistant pixelated vehicle lamp optical structure, comprising:

[0009] A light source for emitting light; and

[0010] A lens group, which includes a first lens with a positive focal power, a second lens with a negative focal power, a third lens with a positive focal power, and a fourth lens with a positive focal power that are sequentially arranged from the image plane to the object plane along the optical axis direction; wherein the first lens is a plastic lens; the second lens, the third lens, and the fourth lens are glass lenses;

[0011] A system aperture, which is arranged on the side of the first lens facing away from the second lens; and

[0012] A vignetting aperture, which is arranged between the third lens and the fourth lens.

[0013] In an optional embodiment of the present utility model, the surface profile of the surface of the first lens facing away from the second lens is spherical, and the surface profile of the surface of the first lens facing the second lens is aspherical.

[0014] In an optional embodiment of the present utility model, the surface profile of the surface of the second lens facing the first lens is aspherical, and the surface profile of the surface of the second lens facing the third lens is spherical.

[0015] In an optional embodiment of the present utility model, the surface profiles of the two surfaces of the third lens and the fourth lens are both spherical.

[0016] In an optional embodiment of the present utility model, the numerical aperture NA of the high heat-resistant pixelated vehicle lamp optical structure satisfies the condition: 0.8 ≥ NA ≥ 0.55.

[0017] In an optional embodiment of the present utility model, the minimum value Nd(1) of the optical refractive index of the first lens, the third lens, and the fourth lens satisfies the constraint: Nd(1) > 1.4; and

[0018] The minimum value Vd(1) of the optical Abbe number of the first lens, the third lens, and the fourth lens satisfies the constraint: Vd(1) > 40.

[0019] In an optional embodiment of the present utility model, the minimum value Nd(2) of the optical refractive index of the second lens satisfies the constraint: Nd(2) > 1.7; and

[0020] The minimum value Vd(2) of the optical Abbe number of the second lens satisfies the constraint: Vd(2) < 30.

[0021] In an optional embodiment of the present utility model, let the radius of curvature value of the surface of the third lens facing the second lens be R31, and the focal length of the third lens be F3

[0022] The radius of curvature value of the surface of the fourth lens facing the third lens is R41, and the focal length of the fourth lens is F4; then the parameters satisfy the following relationship:

[0023] |R31 / (F3 + F4)| > 0.9, or |R31 / (F3 + F4)| < 0.7;

[0024] 0.1 < |R41 / F4| < 0.7.

[0025] In an alternative embodiment of the present invention, let the focal length of the first lens be F1, the focal length of the second lens be F2, and the focal length of the high heat - resistant pixelated vehicle headlight optical structure be F; then the parameters satisfy the following relationship:

[0026] |F2 / (F1 + F2 + F3 + F4)| > 0.5.

[0027] In an alternative embodiment of the present invention, the second lens and the third lens are glued together.

[0028] Adopting the above - mentioned technical solutions, the present invention has the following beneficial effects: For the high heat - resistant pixelated vehicle headlight optical structure of the present invention and the projection - type vehicle headlight using the same, the first lens is the light - emitting lens and also the shaping surface. The plastic material has a large processing freedom and can meet the requirements of different shapes. The second lens, the third lens, and the fourth lens are made of glass lenses to meet the heat - resistance requirements. The above combination can well improve the freedom of light - emitting shaping design and meet the requirements of shaping and heat resistance at the same time. In addition, it has a large aperture, which can improve the optical efficiency of the system, and at the same time has good resolution and stray light suppression ability, and can meet the use requirements of high - resolution pixelated lighting. Brief Description of the Drawings

[0029] Figure 1 The figure shows the high heat - resistant pixelated vehicle headlight optical structure of the present invention;

[0030] Figure 2 The figure shows the distortion diagram of the high heat - resistant pixelated vehicle headlight optical structure under the parameters of Embodiment 2 of the present invention;

[0031] Figure 3 The figure shows the MTF curve diagram of the high heat - resistant pixelated vehicle headlight optical structure under the parameters of Embodiment 2 of the present invention.

[0032] In the figure: the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the light source 5, the system aperture stop 6, the vignetting stop 7. Detailed Description of the Embodiment

[0033] In order to make the content of the present invention be more clearly understood, the present invention will be further described in detail below according to specific embodiments and in conjunction with the drawings.

[0034] Embodiment 1:

[0035] Please refer to Figures 1 to 3 As shown, this embodiment provides a high heat-resistant pixelated vehicle lighting optical structure, including: a light source 5 for emitting light, a lens group, a system aperture 6, and a vignetting aperture 7.

[0036] Next, in detail, first, the lens group adopted in this embodiment includes a first lens 1 with a positive optical power, a second lens 2 with a negative optical power, a third lens 3 with a positive optical power, and a fourth lens 4 with a positive optical power, which are arranged in sequence from the image plane to the object plane along the optical axis direction. The second lens 2 and the third lens 3 are glued and fixed together.

[0037] The first lens 1 is an outgoing light lens. In order to ensure that the surface 11 of the first lens 1 facing away from the second lens 2 has a smooth transition in surface shape under different shapes, the surface 11 of the first lens 1 facing away from the second lens 2 is designed as a gentle convex surface.

[0038] Among them, the first lens 1 is a plastic lens, and the plastic lens here can also be replaced with a moldable optical glass lens; the second lens 2, the third lens 3, and the fourth lens 4 are glass lenses. The first lens 1 is an outgoing light lens and also a shaping surface. The plastic material has a large processing freedom and can meet the requirements of different shapes. The second lens 2, the third lens 3, and the fourth lens 4 adopt glass lenses to meet the heat resistance requirements. The above combination can well improve the freedom of the outgoing light shaping design and meet the shaping and heat resistance requirements at the same time.

[0039] In this embodiment, a positive optical power means that the optical angle is positive, and a negative optical power means that the optical angle is negative. The optical power, also known as the diopter, is used to characterize the ability of the lens surface to focus or diverge light. The greater the optical power, the stronger the deflection ability of the lens surface to light.

[0040] Based on the above situation, it further needs to be explained that in this embodiment, the surface shape of the surface 11 of the first lens 1 facing away from the second lens 2 is a spherical surface, and the surface shape of the surface 12 of the first lens 1 facing the second lens 2 is an aspherical surface. The surface shape of the surface 21 of the second lens 2 facing the first lens 1 is an aspherical surface, and the surface shape of the surface 22 of the second lens 2 facing the third lens 3 is a spherical surface. The surface shapes of the two surfaces of the third lens 3 and the fourth lens 4 are both spherical surfaces.

[0041] The minimum value Nd(1) of the optical refractive index of the first lens 1, the third lens 3, and the fourth lens 4 satisfies the constraint: Nd(1)>1.4; and the minimum value Vd(1) of the optical Abbe number of the first lens 1, the third lens 3, and the fourth lens 4 satisfies the constraint: Vd(1)>40.

[0042] The minimum value Nd(2) of the optical refractive index of the second lens 2 satisfies the constraint: Nd(2) > 1.7; and the minimum value Vd(2) of the optical Abbe number of the second lens 2 satisfies the constraint: Vd(2) < 30.

[0043] In addition, let the radius of curvature value of the surface 31 of the third lens 3 facing the second lens 2 be R31, and the focal length of the third lens 3 be F3, and the radius of curvature value of the surface 41 of the fourth lens 4 facing the third lens 3 be R41, and the focal length of the fourth lens 4 be F4; then the parameters satisfy the following relationship: |R31 / (F3 + F4)| > 0.9, or |R31 / (F3 + F4)| < 0.7; 0.1 < |R41 / F4| < 0.7.

[0044] Based on the above structure, let the focal length of the first lens 1 be F1, the focal length of the second lens 2 be F2, and the focal length of the high heat-resistant pixelated vehicle headlight optical structure be F; then the parameters satisfy the following relationship:

[0045] |F2 / (F1 + F2 + F3 + F4)| > 0.5.

[0046] Next is the system aperture 6, which is arranged on the side of the first lens 1 facing away from the second lens 2. Then there is the vignetting aperture 7, which is arranged between the third lens 3 and the fourth lens 4 and is biased towards the fourth lens 4.

[0047] Based on the above situation, it should be further noted that the numerical aperture NA of the high heat-resistant pixelated vehicle headlight optical structure in this embodiment satisfies the condition: 0.8 ≥ NA ≥ 0.55.

[0048] Adopting the structural design of the present utility model, only the design of the first lens 1 needs to be changed, and the structures of the second lens 2, the third lens 3, and the fourth lens 4 remain unchanged, which can meet the appearance modeling requirements of different vehicle models, making the system have high modeling adaptability, reducing the impact of different models on the overall design, and achieving the maximum customization requirements with the smallest change; that is to say, this structure gives the first lens 1 great modeling freedom without affecting the optical performance, and only by changing the first lens 1 can it match the different modeling requirements of the light outlet of different vehicle models, with great modeling adaptability and cost savings.

[0049] Furthermore, the first lens 1 is a light-emitting lens and also a modeling surface. The plastic material has a large processing freedom and can meet different modeling requirements. The second lens 2, the third lens 3, and the fourth lens 4 are made of glass lenses to meet the heat resistance requirements. The above combination can well improve the freedom of the light-emitting modeling design and meet the modeling and heat resistance requirements at the same time. In addition, having a large aperture can improve the optical efficiency of the system, and at the same time has good resolution and stray light suppression ability, which can meet the use requirements of high-resolution pixelated lighting.

[0050] Example 2:

[0051] Based on the high heat-resistant pixelated vehicle headlight optical structure of Example 1, the relevant parameters of each lens of the high heat-resistant pixelated vehicle headlight optical structure in this example are as follows:

[0052] Table 1

[0053]

[0054] In Table 1, 11 represents the light-emitting surface of the first lens 1, 12 represents the light-incident surface of the first lens 1, 21 represents the light-emitting surface of the second lens 2, 22 represents the light-incident surface of the second lens 2, 31 represents the light-emitting surface of the third lens 3, 32 represents the light-incident surface of the third lens 3, 41 represents the light-emitting surface of the fourth lens 4, and 42 represents the light-incident surface of the fourth lens 4.

[0055] Table 2

[0056] Aspherical coefficient S2 S3 c 0.021 -0.006 k -1.14 -11.15 α1 0.00 0.00 α2 -1.17E-06 3.42E-06 α3 1.48E-09 -3.31E-09 α4 -7.23E-12 3.27E-12 α5 0 0 α6 0 0 α7 0 0 α8 0 0

[0057] Among them, c in the aspheric coefficient represents the curvature, that is, the reciprocal of the radius of curvature; k represents the conic coefficient.

[0058] The formula for the aspheric surface shape is as follows:

[0059]

[0060] Among them, Z represents the sag height at a position on the optical surface where the distance from the center of the optical surface is r.

[0061] In this example, the minimum value Nd(1) of the optical refractive index of the first lens 1, the third lens 3, and the fourth lens 4 satisfies the constraint: Nd(1) > 1.49; and the minimum value Vd(1) of the optical Abbe number of the first lens 1, the third lens 3, and the fourth lens 4 satisfies the constraint: Vd(1) > 50. The minimum value Nd(2) of the optical refractive index of the second lens 2 satisfies the constraint: Nd(2) > 1.8; and the minimum value Vd(2) of the optical Abbe number of the second lens 2 satisfies the constraint: Vd(2) < 26.

[0062] The numerical aperture NA of the high heat-resistant pixelated vehicle headlight optical structure in this example satisfies the conditions: NA = 0.7; |R31 / (F3 + F4)| = 0.21; |R41 / F4| = 0.25; |F2 / (F1 + F2 + F3 + F4)| = 9.3.

[0063] In this implementation case, the absolute value of the distortion of the high heat-resistant pixelated vehicle lighting optical structure is less than 4%, and the light pattern projected has little deformation. In addition, the MTF (MTF (Modulation Transfer Function) represents the degree of attenuation of contrast after the sine intensity distribution functions of different frequencies are imaged by the optical system) of the high heat-resistant pixelated vehicle lighting optical structure in this implementation case is greater than 30%, and the resolution meets the requirements of adaptive high and low beams.

[0064] In summary, for the high heat-resistant pixelated vehicle lighting optical structure of this embodiment, it has a large aperture to improve the optical efficiency of the system, and at the same time has good resolution and stray light suppression ability, which can meet the usage requirements of high-resolution pixelated lighting.

[0065] The above specific embodiments have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0066] In the description of the present invention, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0067] In the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the present invention, unless otherwise clearly specified and defined, the first feature being above or below the second feature may include the direct contact of the first and second features, or may include the non-direct contact of the first and second features but through other features between them. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, under, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

Claims

1. A highly heat-resistant pixelated car light optical structure, characterized in that: include: A light source, for emitting light; and A lens group, comprising a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, and a fourth lens with positive focal power, which are sequentially arranged along an optical axis from an image plane to an object plane; wherein the first lens is a plastic lens; and the second lens, the third lens, and the fourth lens are glass lenses; a system aperture, which is arranged on a side of the first lens facing away from the second lens; as well as A vignetting stop is disposed between the third lens element and the fourth lens element.

2. The high heat-resistant pixelated car light optical structure according to claim 1, characterized in that: The surface of the first lens facing away from the second lens is a spherical surface, and the surface of the first lens facing the second lens is an aspherical surface.

3. The high heat-resistant pixelated car light optical structure according to claim 1 or 2, characterized in that: The surface of the second lens facing the first lens is aspherical, and the surface of the second lens facing the third lens is spherical.

4. The high heat-resistant pixelated car light optical structure according to claim 3, characterized in that: Both surfaces of the third lens and the fourth lens are spherical.

5. The high heat-resistant pixelated car light optical structure according to claim 1, characterized in that: The numerical aperture NA of the high heat-resistant pixelated car light optical structure satisfies the condition: 0.8≥NA≥0.

55.

6. The high heat-resistant pixelated car light optical structure according to claim 1, characterized in that: The lowest value Nd(1) of the optical refractive index of the first lens, the third lens and the fourth lens satisfies the constraint: Nd(1)>1.4; and The lowest value Vd(1) of the optical Abbe numbers of the first lens, the third lens and the fourth lens satisfies the constraint: Vd(1)>40.

7. The high heat-resistant pixelated vehicle light optical structure according to claim 1 or 6, characterized in that: The lowest value Nd(2) of the optical refractive index of the second lens satisfies the constraint: Nd(2)>1.7; and The lowest value Vd(2) of the optical Abbe number of the second lens satisfies the constraint: Vd(2)<30.

8. The high heat-resistant pixelated vehicle light optical structure according to claim 1, characterized in that: Assume that the curvature radius of the surface of the third lens facing the second lens is R31, and the focal length of the third lens is F3 The curvature radius of the surface of the fourth lens facing the third lens is R41, and the focal length of the fourth lens is F4; then the parameters satisfy the following relationship: |R31 / (F3+F4)|>0.9, or |R31 / (F3+F4)|<0.7; 0.1<|R41 / F4|<0.

7.

9. The high heat-resistant pixelated vehicle light optical structure according to claim 8, characterized in that: Assuming that the focal length of the first lens is F1, the focal length of the second lens is F2, and the focal length of the high heat-resistant pixelated headlight optical structure is F; the parameters satisfy the following relationship: |F2 / (F1+F2+F3+F4)|>0.

5.

10. The high heat-resistant pixelated vehicle light optical structure according to claim 1, characterized in that: The second lens is cemented together with the third lens.

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