Optical structure applied to self-closed-loop car lamp

Abstract

The invention relates to the technical field of projection lenses and self-closed-loop projection vehicle lamps based on Micro-LED, in particular to an optical structure applied to a self-closed-loop vehicle lamp, which comprises a system diaphragm, a vignetting diaphragm, and a first lens, a second lens, a third lens, a fourth lens and a Micro-LED light source which are arranged in sequence, the first lens, the third lens and the fourth lens have positive focal power, the second lens has negative focal power, the focal lengths of the first lens, the second lens, the third lens and the fourth lens are F1, F2, F3 and F4 in sequence, the focal length of the whole lens optical system is F, and the following relation is met: (F1) / (F3 + F4) lt, 0.5, F2 / Fgt; and 1.2. The large-aperture large-resolution pixelated lens has the characteristics of large aperture and high resolution, the large aperture can meet the requirement of efficient illumination, and the high resolution can meet the technical requirement of high-resolution pixelated illumination; a full-glass structure is adopted, a Micro-LED light source with each pixel capable of independently emitting light is matched, and the performance requirements of self-adaption of high and low beams in a self-closed-loop vehicle lamp and a projection interaction vehicle lamp under different working conditions can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of Micro-LED-based projection lenses and self-closed-loop projection vehicle lamps, and in particular to an optical structure applied to self-closed-loop projection pixelated vehicle lamps. Background Art

[0002] As car lights develop towards intelligence, the coordination between car lights and vehicle control systems has become an important part of the development process of intelligent car lights. Usually, it requires in-depth communication and collaboration between the lighting factory and the OEM. Intelligent car lights can usually be divided into perception units, decision units and execution units. The perception unit is usually composed of a camera or radar system, which is responsible for the perception of scenes such as road conditions. The decision unit is responsible for analyzing the received scenes and outputting relevant execution decisions. The execution unit is responsible for the lighting of the road surface, usually a pixelated car light module. The traditional development model is: the OEM is responsible for the development of the perception unit and the decision unit, and the lighting factory is responsible for the development of the execution unit. The collaborative development puts high demands on the systematization of the OEM and the lighting factory. In order to simplify the development scale and standardize the intelligent car light module, a self-closed-loop car light solution is proposed, that is, the perception unit, decision unit and execution unit are all encapsulated inside the headlight, and the development work is closed in the lighting factory, reducing the development workload of the whole vehicle.

[0003] The present invention proposes an optical structure, which is a core optical element in an execution unit, and meets the lighting requirements of a self-closed-loop vehicle lamp execution unit for high resolution and high brightness of a module. Summary of the invention

[0004] The purpose of the present invention is to solve the defects and shortcomings in the prior art and to provide an optical structure for a self-closed loop vehicle lamp.

[0005] To achieve the above object, the technical solution adopted by the present invention is: an optical structure applied to a self-closed loop vehicle lamp, comprising a system aperture, a vignetting aperture, and a first lens, a second lens, a third lens, a fourth lens and a Micro-LED light source arranged in sequence,

[0006] Among them, the first lens, the third lens and the fourth lens have positive focal power, the second lens has negative focal power, and the focal lengths of the first lens, the second lens, the third lens and the fourth lens are F1, F2, F3 and F4 respectively, and the focal length of the entire lens optical system is F, satisfying the following relationship: |(F1) / (F3+F4)|<0.5, |F2 / F|>1.2.

[0007] Preferably, the first lens is a spherical or aspherical lens, and the second lens (2), the third lens and the fourth lens are all spherical lenses.

[0008] Preferably, the optical refractive indexes of the first lens, the second lens, the third lens and the fourth lens are Nd1, Nd2, Nd3 and Nd4 respectively, satisfying the following conditions: Nd1>1.5, Nd2>1.7.

[0009] Preferably, the optical Abbe numbers of the first lens, the second lens, the third lens and the fourth lens are Vd1, Vd2, Vd3 and Vd4 respectively, satisfying the following conditions: Vd1>40, Vd2<26.

[0010] Preferably, the first surface curvature radius of the third lens is R3, the first surface curvature radius of the fourth lens is R4, and parameters R3 and R4 satisfy the following relationship with the focal length F3 of the third lens and the focal length F4 of the fourth lens: |R3 / (F3+F4)|<1.3 or |R3 / (F3+F4)|>1.6, 0.1<|R4 / F4|<0.6.

[0011] Preferably, the system aperture is located in front of or behind the first lens, and the vignetting aperture is located between the third lens and the fourth lens, and / or between the fourth lens and the Micro-LED light source.

[0012] Preferably, the numerical aperture NA of the optical structure satisfies the condition: 0.9≥NA≥0.55.

[0013] Preferably, the first lens, the second lens, the third lens and the fourth lens are made of optical glass.

[0014] After adopting the above technical solution, the present invention has the following beneficial effects:

[0015] The pixelated headlight optical structure provided by the present invention has the characteristics of large aperture and high resolution. The large aperture can meet the requirements of efficient lighting, and the high resolution can meet the technical requirements of high-resolution pixelated lighting. It adopts an all-glass structure and matches a Micro-LED light source in which each pixel can emit light independently, which can meet the performance requirements of adaptive high and low beams and projection interactive headlights under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0017] Figure 2 is a distortion diagram of the first embodiment of the present invention;

[0018] Figure 3 This is the MTF diagram of the first embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0020] Figure 5 is a distortion diagram of the second embodiment of the present invention;

[0021] Figure 6 This is the MTF diagram of the second embodiment of the present invention.

[0022] Among them: the first lens 1, the first surface 11 of the first lens, the second surface 12 of the first lens, the second lens 2, the first surface 21 of the second lens, the second surface 22 of the second lens, the third lens 3, the first surface 31 of the third lens, the second surface 32 of the third lens, the fourth lens 4, the first surface 41 of the fourth lens, the second surface 42 of the fourth lens, the Micro-LED light source 5, the system aperture 6, and the vignetting aperture 7. DETAILED DESCRIPTION

[0023] The present invention is further described clearly and completely below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0026] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0027] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0028] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0029] like Figure 1 , 4 As shown, the present invention mainly provides two specific embodiments to illustrate an optical structure of the present invention applied to a self-closed loop vehicle lamp.

[0030] The common parts of the two embodiments of the present invention include a system aperture 6, a vignetting aperture 7, and a first lens 1 with positive focal power, a second lens 2 with negative focal power, a third lens 3 with positive focal power, a fourth lens 4 with positive focal power, and a Micro-LED light source 5 in which each pixel can emit light independently.

[0031] The material of each lens is optical glass, which can improve the performance stability of the system in a large temperature range. The first lens 1 is a spherical or aspherical lens, and the second lens 2, the third lens 3, and the fourth lens 4 are all spherical lenses; the optical refractive indexes of the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4 are Nd1, Nd2, Nd3, and Nd4, respectively, and the Abbe numbers are Vd1, Vd2, Vd3, and Vd4, respectively, satisfying the following conditions: Nd1>1.5, Nd2>1.7, and the optical Abbe number Vd1 satisfies the conditions: Vd1>40, Vd2<26.

[0032] The focal lengths of the first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 are F1, F2, F3 and F4 respectively, and the focal length of the entire lens optical system is F, which satisfies the following relationship: |(F1) / (F3+F4)|<0.5, |F2 / F|>1.2. Further, the curvature radius value of the first surface 31 of the third lens 3 is R3, and the curvature radius value of the first surface 41 of the fourth lens 4 is R4. Parameters R3 and R4 satisfy the following relationship with the focal length F3 of the third lens 3 and the focal length F4 of the fourth lens 4: |R3 / (F3+F4)|<1.3 or |R3 / (F3+F4)|>1.6, 0.1<|R4 / F4|<0.6.

[0033] The system aperture 6 is located in front of or behind the first lens 1, the vignetting aperture 7 is located between the third lens 3 and the fourth lens 4, and / or between the fourth lens 4 and the Micro-LED light source 5, and the numerical aperture NA of the entire optical structure satisfies the condition: 0.9≥NA≥0.55.

[0034] Embodiment 1

[0035] The first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 are all spherical lenses, the system aperture 6 is located in front of the first lens 1, and the vignetting aperture 7 is located between the third lens 3 and the fourth lens 4, wherein:

[0036] Nd1=1.8, Nd2=1.85, Vd1=47, Vd2=24, |R3 / (F3+F4)|=0.48, |R4 / F4|=0.33, |(F1) / (F3+F4)|=0.41, 0.5<|f2 / f|=1.6;

[0037] Table 1 below lists the parameters of the lenses in Example 1:

[0038]

[0039]

[0040] Table 1

[0041] Among them, S1-S8 correspond to the front and back surfaces of the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4 respectively. For example, S1 corresponds to Figure 1 The surface 11 in the image corresponds to the light surface of the Micro-LED light source 5.

[0042] Refer to Table 2 below for a comparison of the actual values ​​and constraints set in Example 1:

[0043]

[0044] Table 2

[0045] At the same time, reference Figure 2 This is the distortion curve of Example 1. It can be seen that the absolute value of distortion is less than 3%, and the projected light pattern is slightly deformed. Figure 3 The MTF transfer function curve of the first embodiment shows that the system meets the MTF>30% and the resolution meets the requirements of adaptive high and low beam. Therefore, this embodiment has the characteristics of large aperture and high resolution, which can meet the application of adaptive high and low beam and projection interactive car lights.

[0046] Embodiment 2

[0047] The first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 are all spherical lenses, the system aperture 6 is located in front of the first lens 1, and the vignetting aperture 7 is located between the third lens 3 and the fourth lens 4, wherein:

[0048] Nd1=1.8, Nd2=1.95, Vd1=47, Vd2=18, |R3 / (F3+F4)|=0.98, |R4 / F4|=0.24, |(F1) / (F3+F4)|=0.43, 0.5<|f2 / f|=2.3;

[0049] Table 3 below lists the parameters of the lenses in Example 2:

[0050]

[0051] Table 3

[0052] Among them, S1-S8 correspond to the front and back surfaces of the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4 respectively. For example, S1 corresponds to Figure 4 The surface 11 in the image corresponds to the light surface of the Micro-LED light source 5.

[0053] Refer to Table 4 below for a comparison of the actual values ​​and constraints set in Example 2:

[0054]

[0055]

[0056] Table 4

[0057] At the same time, reference Figure 5 This is the distortion curve of Example 2. It can be seen that the absolute value of distortion is less than 4%, and the projected light pattern is slightly deformed. Figure 6 The MTF transfer function curve of the second embodiment shows that the system meets the MTF>40%, and the resolution meets the requirements of adaptive high and low beam. Therefore, this embodiment has the characteristics of large aperture and high resolution, which can meet the application of adaptive high and low beam and projection interactive car lights.

[0058] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An optical structure applied to a self-closed loop vehicle lamp, characterized in that: The invention comprises a system aperture (6), a vignetting aperture (7), and a first lens (1), a second lens (2), a third lens (3), a fourth lens (4) and a Micro-LED light source (5) which are arranged in sequence. The first lens (1), the third lens (3) and the fourth lens (4) have positive focal power, the second lens (2) has negative focal power, and the focal lengths of the first lens (1), the second lens (2), the third lens (3) and the fourth lens (4) are F1, F2, F3 and F4 respectively, and the focal length of the entire lens optical system is F, satisfying the following relationship: |(F1) / (F3+F4)|<0.5, |F2 / F|>1.

2.

2. The optical structure for a self-closed-loop vehicle lamp according to claim 1, characterized in that: The first lens (1) is a spherical or aspherical lens, and the second lens (2), the third lens (3) and the fourth lens (4) are all spherical lenses.

3. The optical structure for a self-closed-loop vehicle lamp according to claim 1, characterized in that: The optical refractive indices of the first lens (1), the second lens (2), the third lens (3) and the fourth lens (4) are Nd1, Nd2, Nd3 and Nd4 respectively, satisfying the following conditions: Nd1>1.5, Nd2>1.

7.

4. The optical structure for a self-closed-loop vehicle lamp according to claim 1, characterized in that: The optical Abbe numbers of the first lens (1), the second lens (2), the third lens (3) and the fourth lens (4) are Vd1, Vd2, Vd3 and Vd4 respectively, satisfying the following conditions: Vd1>40, Vd2<26.

5. The optical structure for a self-closed-loop vehicle lamp according to claim 1, characterized in that: The first surface (31) of the third lens (3) has a curvature radius of R3, the first surface (41) of the fourth lens (4) has a curvature radius of R4, and the parameters R3 and R4 satisfy the following relationship with the focal length F3 of the third lens (3) and the focal length F4 of the fourth lens (4): |R3 / (F3+F4)|<1.3 or |R3 / (F3+F4)|>1.6, 0.1<|R4 / F4|<0.

6.

6. The optical structure for a self-closed-loop vehicle lamp according to claim 1, characterized in that: The system aperture (6) is located in front of or behind the first lens (1), and the vignetting aperture (7) is located between the third lens (3) and the fourth lens (4), and / or between the fourth lens (4) and the Micro-LED light source (5).

7. The optical structure for a self-closed-loop vehicle lamp according to claim 1, characterized in that: The numerical aperture NA of the optical structure satisfies the condition: 0.9≥NA≥0.

55.

8. The optical structure for a self-closed-loop vehicle lamp according to claim 1, characterized in that: The materials of the first lens (1), the second lens (2), the third lens (3) and the fourth lens (4) are optical glass.

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