Optical system, headlight, and method for controlling headlight

Abstract

The embodiment of the invention particularly relates to an optical system, a headlamp and a control method of the headlamp, and belongs to the technical field of vehicles. The embodiment of the invention aims to solve the problem that two optical systems need to be arranged when the headlamp is in a projection mode and an illumination mode in the prior art. The optical system comprises a light source and an optical lens set, the optical lens set is located in the light emitting direction of the light source, the optical lens set has a first state and a second state, and when the optical lens set is in the first state, the optical lens set is configured to have a first focal length so that light emitted by the light source can be used for projection after passing through the optical lens set; and when the optical lens group is in the second state, the optical lens group is configured to have a second focal length, so that light emitted by the light source is used for illumination after passing through the optical lens group. The optical system provided by the embodiment of the invention can be suitable for a projection mode and an illumination mode, the size of the headlamp is reduced, the number of parts of the headlamp is reduced, and meanwhile, the power consumption of the headlamp is also reduced.

Description

Technical Field

[0001] The embodiments of the present application belong to the field of vehicle technology, and more particularly, relate to an optical system, a headlamp, and a method for controlling the headlamp. Background Art

[0002] At present, vehicle headlights usually have an adaptive driving beam (ADB) mode and a projection mode. When the headlight is in the adaptive driving beam mode, the high beam type can be automatically changed during the vehicle's driving. When the headlight is in the projection mode, the icon can be projected onto the ground, etc., for the driver to see.

[0003] However, in the headlights in the related art, the adaptive high beam mode and the projection mode need to be realized by setting up two sets of optical systems, which increases the size of the headlights and is not conducive to the styling design of the headlights; it also increases the number of parts of the headlights and increases the cost of the headlights; and it increases the power consumption of the headlights and increases the heat dissipation pressure of the headlights. Summary of the invention

[0004] In view of this, the embodiments of the present application provide an optical system, a headlamp and a method for controlling the headlamp to solve the technical problem that the adaptive high beam mode and the projection mode need to be realized by setting up two optical systems.

[0005] A first aspect of an embodiment of the present application provides an optical system, comprising a light source and an optical lens group, wherein the optical lens group is located in a light emitting direction of the light source, and the optical lens group has a first state and a second state. When the optical lens group is in the first state, it is configured to have a first focal length, so that the light emitted by the light source is used for projection after passing through the optical lens group; when the optical lens group is in the second state, it is configured to have a second focal length, so that the light emitted by the light source is used for illumination after passing through the optical lens group.

[0006] The optical system of the embodiment of the present application, when it is in the first state, the light emitted by the light source can be used for projection after passing through the optical lens group; when it is in the second state, the light emitted by the light source can be used for lighting after passing through the optical lens group. The optical system of the embodiment of the present application can be applicable to the projection mode and the lighting mode, and the lighting mode can be an adaptive high beam mode. Compared with the related art that the adaptive high beam mode and the projection mode need to be realized by setting up two sets of optical systems, the embodiment of the present application can reduce the size of the optical system, thereby reducing the size of the headlamp, which is beneficial to the shape design of the headlamp; and reduce the number of parts of the headlamp, thereby reducing the cost of the headlamp; in addition, it also reduces the power consumption of the headlamp, thereby reducing the heat dissipation pressure of the headlamp.

[0007] In some implementations, which may include the above embodiments, the first focal length is greater than the second focal length.

[0008] In some implementations that may include the above embodiments, the first focal length is greater than or equal to 27 mm, and the second focal length is less than or equal to 24 mm.

[0009] In some implementations that may include the above embodiments, when the optical lens assembly is in a first state, the optical lens assembly has a first resolution; when the optical lens assembly is in a second state, the optical lens assembly has a second resolution that is smaller than the first resolution.

[0010] In some implementations that may include the above embodiments, when the optical lens assembly is in a first state, the optical lens assembly has a first aperture number; when the optical lens assembly is in a second state, the optical lens assembly has a second aperture number, and the second aperture number is smaller than the first aperture number.

[0011] In some implementations that may include the above embodiments, the first aperture number is greater than or equal to 0.7, and the second aperture number is less than or equal to 0.67.

[0012] In some implementations that may include the above embodiments, when the optical lens assembly is in a first state, the optical lens assembly has a first field of view angle; when the optical lens assembly is in a second state, the optical lens assembly has a second field of view angle, and the second field of view angle is greater than the first field of view angle.

[0013] In some implementations that may include the above embodiments, the first field of view angle is less than or equal to 28°, and the second field of view angle is greater than or equal to 30°.

[0014] In some implementations that may include the above embodiments, the optical lens assembly has a first parameter value A1, and the first parameter value A1 satisfies the following relationship:

[0015] A1 = D / H / FOV;

[0016] Wherein, D is the maximum clear aperture, H is the image height corresponding to the maximum field of view angle, and FOV is the field of view angle; the first parameter value A1 is less than or equal to 0.35.

[0017] In some implementations that may include the above embodiments, the optical lens assembly has a second parameter value A2, and the second parameter value A2 satisfies the following relationship:

[0018] A2=|(HF*θ) / (F*θ)|;

[0019] Wherein, H is the image height corresponding to the maximum field of view angle, F is the focal length of the optical lens assembly, θ is the radian value of the maximum field of view angle; and the second parameter value A2 is less than or equal to 0.07.

[0020] In some implementations that may include the above embodiments, the optical lens assembly has a third parameter value A3, and the third parameter value A3 satisfies the following relationship:

[0021] A3=BFL / TTL;

[0022] Wherein, BFL is the optical back focus, TTL is the total optical length; and the third parameter value A3 is less than or equal to 0.06.

[0023] In some implementations that may include the above embodiments, the optical lens assembly has a fourth parameter value A4, and the fourth parameter value A4 satisfies the following relationship:

[0024] A4=F / H;

[0025] Wherein, F is the focal length of the optical lens assembly; H is the image height corresponding to the maximum field of view; and the fourth parameter value A4 is less than or equal to 4.3.

[0026] In some implementations that may include the above embodiments, the optical lens assembly has a fifth parameter value A5, and the fifth parameter value A5 satisfies the following relationship:

[0027] A5=TTL / F;

[0028] Wherein, F is the focal length of the optical lens assembly, TTL is the total optical length; and a ratio of a fifth parameter value A5 when the optical lens assembly is in the second state to a fifth parameter value A5 when the optical lens assembly is in the first state is greater than or equal to 0.7 and less than or equal to 1.4.

[0029] In some implementations that may include the above embodiments, the optical lens group includes a fixed lens group and a movable lens group that are spaced apart along a center line of the light source; the movable lens group is configured such that when the optical lens group is in a first state, the movable lens group moves to a first position along a first direction relative to the fixed lens group, and the first direction is parallel to the optical axis of the optical system; when the optical lens group is in a second state, the movable lens group moves to a second position along a second direction relative to the fixed lens group, and the second direction is opposite to the first direction.

[0030] In some implementations that may include the above embodiments, the fixed mirror group includes a first fixed mirror group and / or a second fixed mirror group, the first fixed mirror group is closer to the light source than the movable mirror group; the second fixed mirror group is farther away from the light source than the movable mirror group; the movable mirror group is configured so that when the optical mirror group is in a first state, the movable mirror group moves toward the light source to the first position; and the movable mirror group is configured so that when the optical mirror group is in a second state, the movable mirror group moves away from the light source to the second position.

[0031] In some implementations that may include the above embodiments, the first fixed mirror group includes at least one lens; and / or the second fixed mirror group includes at least one lens.

[0032] In some implementations that may include the above embodiments, the distance between a lens in the movable mirror group adjacent to the first fixed mirror group and the first fixed mirror group is a first distance, the distance between a lens in the movable mirror group adjacent to the second fixed mirror group and the second fixed mirror group is a second distance, and a ratio of the second distance to the first distance is greater than or equal to 0.2 and less than or equal to 3.

[0033] In some implementations that may include the above embodiments, the insert lens assembly includes a lens having a focal length that is smaller than a first focal length of the optical lens assembly when in the first state and smaller than a second focal length of the optical lens assembly when in the second state.

[0034] In some implementations that may include the above embodiments, the inserted lens group includes a plurality of lenses, and the sum of the optical focal lengths of the lenses in the movable lens group is less than the reciprocal of a first focal length when the optical lens group is in the first state, and is less than the reciprocal of a second focal length when the optical lens group is in the second state.

[0035] In some implementations that may include the above embodiments, the first fixed lens group includes a first positive power lens, a surface of the first positive power lens facing the light source is a first concave surface, and a surface of the first positive power lens facing away from the light source is a first convex surface.

[0036] In some implementations that may include the above-mentioned embodiments, the radius of the first concave surface is greater than or equal to 14 mm and less than or equal to 17 mm; the radius of the first convex surface is greater than or equal to 15 mm and less than or equal to 18 mm; the distance between the first convex surface and the first concave surface is greater than or equal to 3 mm and less than or equal to 6 mm.

[0037] In some implementations that may include the above-mentioned embodiments, the refractive index of the first positive power lens is greater than or equal to 1.6 and less than or equal to 2.2; the Abbe number of the first positive power lens is greater than or equal to 33 and less than or equal to 37.

[0038] In some implementations that may include the above embodiments, the movable mirror group includes a second positive power lens, a third positive power lens, and a first negative power lens that are sequentially spaced along the first direction; the surface of the second positive power lens facing the first fixed mirror group is a second concave surface, and the surface of the second positive power lens facing away from the first fixed mirror group is a second convex surface; the surface of the third positive power lens facing the second positive power lens is a third convex surface, and the surface of the third positive power lens facing away from the second positive power lens is a fourth convex surface; the surface of the first negative power lens facing the third positive power lens is a third concave surface, and the surface of the first negative power lens facing away from the third positive power lens is a fourth concave surface.

[0039] In some implementations that may include the above embodiments, the radius of the second concave surface is greater than or equal to 46 mm and less than or equal to 49 mm; when the optical lens assembly is in the first state, the distance between the second concave surface and the first fixed lens assembly is greater than or equal to 3 mm and less than or equal to 6 mm; when the optical lens assembly is in the second state, the distance between the second concave surface and the first fixed lens assembly is greater than or equal to 5 mm and less than or equal to 8 mm; the radius of the second convex surface is greater than or equal to 21 mm and less than or equal to 24 mm; the distance between the second convex surface and the second concave surface is greater than or equal to 10 mm and less than or equal to 13 mm;

[0040] And / or, the radius of the third convex surface is greater than or equal to 30 mm and less than or equal to 33 mm; the distance between the third convex surface and the second convex surface is greater than or equal to 1 mm and less than or equal to 4 mm; the radius of the fourth convex surface is greater than or equal to 104 mm and less than or equal to 107 mm; the distance between the fourth convex surface and the third convex surface is greater than or equal to 9 mm and less than or equal to 12 mm;

[0041] And / or, the radius of the third concave surface is greater than or equal to 52 mm and less than or equal to 55 mm; the distance between the third concave surface and the fourth convex surface is greater than or equal to 3 mm and less than or equal to 6 mm; the radius of the fourth concave surface is greater than or equal to 27 mm and less than or equal to 30 mm; the distance between the fourth concave surface and the third concave surface is greater than or equal to 0 mm and less than or equal to 3 mm; when the optical lens assembly is in the first state, the distance between the fourth concave surface and the second fixed lens assembly is greater than or equal to 10 mm and less than or equal to 13 mm; when the optical lens assembly is in the second state, the distance between the fourth concave surface and the second fixed lens assembly is greater than or equal to 7 mm and less than or equal to 10 mm.

[0042] In some implementations that may include the above embodiments, the refractive index of the second positive power lens is greater than or equal to 1.5 and less than or equal to 2.1; the Abbe number of the second positive power lens is greater than or equal to 37 and less than or equal to 41;

[0043] And / or, the refractive index of the third positive power lens is greater than or equal to 1.5 and less than or equal to 2; the Abbe number of the third positive power lens is greater than or equal to 44 and less than or equal to 48;

[0044] And / or, the refractive index of the first negative optical focal length lens is greater than or equal to 1.5 and less than or equal to 2.1; the Abbe number of the first negative optical focal length lens is greater than or equal to 22 and less than or equal to 26.

[0045] In some implementations that may include the above embodiments, the second fixed mirror group includes a fourth positive power lens, the surface of the fourth positive power lens facing the movable mirror group is a fifth convex surface, and the surface of the fourth positive power lens facing away from the movable mirror group is a sixth convex surface.

[0046] In some embodiments that may include the above-mentioned embodiments, the radius of the fifth convex surface is greater than or equal to 83 mm and less than or equal to 86 mm; the radius of the sixth convex surface is greater than or equal to 29 mm and less than or equal to 32 mm; the distance between the sixth convex surface and the fifth convex surface is greater than or equal to 11 mm and less than or equal to 14 mm.

[0047] In some implementations that may include the above-mentioned embodiments, the refractive index of the fourth positive power lens is greater than or equal to 1.1 and less than or equal to 1.7; the Abbe number of the fourth positive power lens is greater than or equal to 55 and less than or equal to 59.

[0048] In some implementations that may include the above-mentioned embodiments, the optical system includes a third fixed lens group and an insertion lens group; the third fixed lens group is located in the light emitting direction of the light source; the insertion lens group is configured so that when the optical lens group is in the first state, the insertion lens group is located at a third position, and the third position is not between the third fixed lens group and the light source, and is not located in the third fixed lens group; the insertion lens group is further configured so that when the optical lens group is in the second state, the insertion lens group is located at a fourth position, and the fourth position is located between the third fixed lens group and the light source, or is located in the third fixed lens group.

[0049] In some implementations that may include the above embodiments, when the optical lens group is in the second state, the insertion lens group is located between the third fixed lens group and the light source.

[0050] In some implementations that may include the above embodiments, the third fixed lens group includes at least two lenses; and / or the insertion lens group includes at least one lens.

[0051] In some implementations that may include the above embodiments, the sum of focal lengths of the lenses in the inserted lens assembly is greater than a first focal length when the optical lens assembly is in the first state, and greater than a second focal length when the optical lens assembly is in the second state.

[0052] In some implementations that may include the above embodiments, the third fixed lens group includes a fifth positive power lens, a sixth positive power lens, a second negative power lens and a seventh positive power lens, which are arranged in sequence along the light emitting direction of the light source; the surface of the fifth positive power lens facing the light source is a fifth concave surface, and the surface of the fifth positive power lens facing away from the light source is a seventh convex surface; the surface of the sixth positive power lens facing the fifth positive power lens is an eighth convex surface; the surface of the sixth positive power lens facing away from the fifth positive power lens is a ninth convex surface; the surface of the second negative power lens facing the sixth positive power lens is a sixth concave surface, and the surface of the second negative power lens facing away from the sixth positive power lens is a seventh concave surface; the surface of the seventh positive power lens facing the second negative power lens is a tenth convex surface; and the surface of the seventh positive power lens facing away from the second negative power lens is an eleventh convex surface.

[0053] In some implementations that may include the above embodiments, the radius of the fifth concave surface is greater than or equal to 29 mm and less than or equal to 32 mm; the radius of the seventh convex surface is greater than or equal to 17 mm and less than or equal to 20 mm; the distance between the seventh convex surface and the fifth concave surface is greater than or equal to 8 mm and less than or equal to 11 mm;

[0054] and / or, the radius of the eighth convex surface is greater than or equal to 39 mm and less than or equal to 42 mm; the distance between the eighth convex surface and the seventh convex surface is greater than or equal to 0 and less than or equal to 3 mm; the radius of the ninth convex surface is greater than or equal to 38 mm and less than or equal to 41 mm; the distance between the ninth convex surface and the eighth convex surface is greater than or equal to 10 mm and less than or equal to 13 mm;

[0055] And / or, the radius of the sixth concave surface is greater than or equal to 10 mm and less than or equal to 13 mm; the distance between the sixth concave surface and the ninth convex surface is greater than or equal to 5 mm and less than or equal to 8 mm; the radius of the seventh concave surface is greater than or equal to 588 mm and less than or equal to 591 mm; the distance between the seventh concave surface and the sixth concave surface is greater than or equal to 3 mm and less than or equal to 6 mm;

[0056] And / or, the radius of the tenth convex surface is greater than or equal to 21 mm and less than or equal to 24 mm; the distance between the tenth convex surface and the seventh concave surface is greater than or equal to 1 mm and less than or equal to 4 mm; the radius of the eleventh convex surface is greater than or equal to 28 mm and less than or equal to 31 mm; the distance between the eleventh convex surface and the tenth convex surface is greater than or equal to 14 mm and less than or equal to 17 mm.

[0057] In some implementations that may include the above embodiments, the refractive index of the fifth positive power lens is greater than or equal to 1.3 and less than or equal to 1.9; the Abbe number of the fifth positive power lens is greater than or equal to 58 and less than or equal to 62;

[0058] And / or, the refractive index of the sixth positive power lens is greater than or equal to 1.4 and less than or equal to 2.0; the Abbe number of the sixth positive power lens is greater than or equal to 52 and less than or equal to 56;

[0059] And / or, the refractive index of the second negative power lens is greater than or equal to 1.2 and less than or equal to 1.8; the Abbe number of the second negative power lens is greater than or equal to 25 and less than or equal to 29;

[0060] And / or, the refractive index of the seventh positive power lens is greater than or equal to 1.1 and less than or equal to 1.7; the Abbe number of the seventh positive power lens is greater than or equal to 54 and less than or equal to 58.

[0061] In some implementations that may include the above-mentioned embodiments, the inserted lens group includes an eighth positive power lens, and the eighth positive power lens is located on the side of the third fixed lens group facing the light source, the surface of the eighth positive power lens facing the light source is an eighth concave surface, and the surface of the eighth positive power lens facing away from the light source is a twelfth convex surface.

[0062] In some implementations that may include the above-mentioned embodiments, the radius of the eighth concave surface is greater than or equal to 47 mm and less than or equal to 50 mm; the radius of the twelfth convex surface is greater than or equal to 9 mm and less than or equal to 12 mm, and the distance between the twelfth convex surface and the eighth concave surface is greater than or equal to 2 mm and less than or equal to 5 mm; the distance between the twelfth convex surface and the third fixed mirror group is greater than or equal to 3 mm and less than or equal to 6 mm.

[0063] In some implementations that may include the above-mentioned embodiments, the refractive index of the eighth positive power lens is greater than or equal to 1.3 and less than or equal to 1.9; the Abbe number of the eighth positive power lens is greater than or equal to 58 and less than or equal to 62.

[0064] A second aspect of an embodiment of the present application provides a headlamp, comprising an optical system as described in any one of the above items.

[0065] Since the headlamp of the embodiment of the present application includes the above-mentioned optical system, the headlamp also has the advantages of the above-mentioned optical system, which will not be described in detail here.

[0066] A third aspect of an embodiment of the present application provides a method for controlling a headlamp, which is applied to a vehicle, wherein the vehicle includes the headlamp as described above, and the method includes:

[0067] Acquire a mode switching instruction, wherein the mode switching instruction is used to instruct to switch the working mode of the headlamp to a projection mode or an adaptive high beam mode;

[0068] According to the mode switching instruction, the optical lens assembly of the headlamp is switched to a state corresponding to the mode switching instruction, wherein the state includes a first state or a second state.

[0069] The control method of the headlamp of the embodiment of the present application can control the optical lens group to switch between the first state and the second state through the mode switching instruction, so that the headlamp can switch between the projection mode and the adaptive high beam mode. Compared with the related art that needs to control two sets of optical systems to achieve the switching between the projection mode and the adaptive high beam mode, the control method of the embodiment of the present application only needs to set one mode switching instruction, which simplifies the control steps.

[0070] In some implementations that may include the above embodiments, switching the optical lens assembly of the headlamp to a state corresponding to the mode switching instruction according to the mode switching instruction includes:

[0071] If the mode switching instruction is used to instruct to switch the working mode of the headlamp to the projection mode, controlling the movable lens group of the optical lens group to move to a first position along a first direction relative to the fixed lens group, so as to switch the optical lens group to the first state;

[0072] If the mode switching instruction is used to instruct to switch the working mode of the headlamp to the adaptive high beam mode, controlling the movable lens group of the optical lens group to move to a second position along a second direction relative to the fixed lens group, so as to switch the optical lens group to the second state;

[0073] Wherein, the optical lens group includes a fixed lens group and a movable lens group which are arranged at intervals along the center line of the light source.

[0074] In some implementations that may include the above embodiments, switching the optical lens assembly of the headlamp to a state corresponding to the mode switching instruction according to the mode switching instruction includes:

[0075] If the mode switching instruction is used to instruct to switch the working mode of the headlamp to the projection mode, controlling the insertion lens assembly of the optical lens assembly to be in a third position to switch the optical lens assembly to the first state;

[0076] If the mode switching instruction is used to instruct to switch the working mode of the headlamp to the adaptive high beam mode, controlling the insert lens assembly to be in the fourth position to switch the optical lens assembly to the second state;

[0077] Wherein, the optical lens group includes a third fixed lens group and an insertion lens group; the third fixed lens group is located in the light emitting direction of the light source. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. It is obvious that the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0079] Figure 1 A schematic diagram of the structure of an optical system according to an embodiment of the present application;

[0080] Figure 2 A schematic diagram of the relationship between magnification, projection distance and focal length in the related art;

[0081] Figure 3 for Figure 1 A schematic diagram of the structure when the optical system is in a first state;

[0082] Figure 4 for Figure 1 A schematic diagram of the structure when the optical system is in the second state;

[0083] Figure 5 Schematic diagram of the structure of the optical system in some possible implementations of the embodiments of the present application;

[0084] Figure 6 Schematic diagram of the structure of the optical system in some other possible implementations of the embodiments of the present application;

[0085] Figure 7 Schematic diagram of the structure of the optical system in some other possible implementations of the embodiments of the present application;

[0086] Figure 8 It is a schematic diagram of the structure when the optical system is in the first state in some other possible implementations of the embodiments of the present application;

[0087] Fig. 9 for Figure 8 A schematic diagram of the structure when the optical system is in the second state;

[0088] Fig.10 MTF curves when the optical system is in a first state in some possible implementations of the embodiments of the present application;

[0089] Fig.11 MTF curves when the optical system is in the second state in some possible implementations of the embodiments of the present application;

[0090] Fig.12 It is a schematic diagram of the structure when the optical system is in the first state in some other possible implementations of the embodiments of the present application;

[0091] Fig.13 for Fig.12 A schematic diagram of the structure when the optical system is in the second state;

[0092] Fig.14 Schematic diagram of the structure of the optical system in some other possible implementations of the embodiments of the present application;

[0093] Fig.15 Schematic diagram of the structure of the optical system in some other possible implementations of the embodiments of the present application;

[0094] Fig.16 It is a schematic diagram of the structure when the optical system is in the first state in some other possible implementations of the embodiments of the present application;

[0095] Fig.17 for Fig.16 A schematic diagram of the structure of the optical system when it is in a second state;

[0096] Fig.18 MTF curves when the optical system is in a first state in some other possible implementations of the embodiments of the present application;

[0097] Fig.19 MTF curves when the optical system is in the second state in other possible implementations of the embodiments of the present application;

[0098] Fig. 20 This is a flow chart of a method for controlling a headlamp according to an embodiment of the present application.

[0099] Description of reference numerals:

[0100] 10- Light source;

[0101] 20-optical lens set;

[0102] 210-first fixed mirror group;

[0103] 211-a first positive power lens;

[0104] 220-mobile mirror group;

[0105] 221-motor;

[0106] 222-lens tube;

[0107] 223- transmission screw;

[0108] 224-transmission nut;

[0109] 225-second positive power lens;

[0110] 226-third positive power lens;

[0111] 227-a first negative power lens;

[0112] 230 - second fixed mirror group;

[0113] 231- fourth positive power lens;

[0114] 240-third fixed mirror group;

[0115] 241-fifth positive power lens;

[0116] 242-sixth positive power lens;

[0117] 243- a second negative power lens;

[0118] 244-seventh positive power lens;

[0119] 250-insert mirror assembly;

[0120] 251-Eighth positive power lens. DETAILED DESCRIPTION

[0121] In order to solve the technical problem that the adaptive high beam mode and the projection mode need to be realized by setting two optical systems in the related art. The embodiment of the present application provides an optical system, which can be applied to the projection mode and the adaptive high beam mode by setting the optical lens group to have a variable focal length. Compared with the adaptive high beam mode and the projection mode in the related art that need to be realized by setting two optical systems, the embodiment of the present application can reduce the size of the optical system, thereby reducing the size of the headlamp, which is beneficial to the shape design of the headlamp; and reduce the number of parts of the headlamp, thereby reducing the cost of the headlamp; in addition, it also reduces the power consumption of the headlamp, thereby reducing the heat dissipation pressure of the headlamp.

[0122] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0123] refer to Figure 1 In a first aspect, an embodiment of the present application provides an optical system, comprising a light source 10 and an optical lens assembly 20. The optical lens assembly 20 is located in the light emitting direction of the light source 10. The optical lens assembly 20 has a first state and a second state. When the optical lens assembly 20 is in the first state, it is configured to have a first focal length F t , so that the light emitted by the light source 10 is used for projection after passing through the optical lens assembly 20. When the optical lens assembly 20 is in the second state, it is configured to have a second focal length F a , so that the light emitted by the light source 10 is used for lighting after passing through the optical lens assembly 20.

[0124] refer to Figure 2 and Figure 3 , when the optical system of the embodiment of the present application is in the first state, the light emitted by the light source 10 can be used for projection after passing through the optical lens group 20; when the optical system is in the second state, the light emitted by the light source 10 can be used for lighting after passing through the optical lens group 20. The optical system of the embodiment of the present application can be applicable to the projection mode and the lighting mode, and the lighting mode can be an adaptive high beam mode. Compared with the related art that the adaptive high beam mode and the projection mode need to be realized by setting two sets of optical systems, the embodiment of the present application only needs one set of optical system to meet the requirements of the projection mode and the adaptive high beam mode for the optical system, which reduces the size of the optical system, thereby reducing the size of the headlamp, which is beneficial to the shape design of the headlamp; and reduces the number of parts of the headlamp, thereby reducing the cost of the headlamp; in addition, it also reduces the power consumption of the headlamp, thereby alleviating the heat dissipation pressure of the headlamp.

[0125] It should be noted that Adaptive Driving Beam (ADB) refers to the intelligent high beam function of a vehicle. This function can automatically adjust the light emitted by the headlights according to factors such as the position and distance of the oncoming vehicle, such as adjusting the illumination area of ​​the light, or turning off or dimming the light, so as to avoid glare for the drivers of oncoming vehicles.

[0126] Exemplarily, the light source 10 may be a light-emitting diode (LED) arranged in a matrix. The light emitted by the LED may be white light or light of other colors. A heat sink may also be provided on the backlight side of the light source 10, which can dissipate heat from the light source 10 and avoid blocking the light emitted by the light source 10, thereby increasing the service life of the light source. It should be noted that the backlight side of the light source 10 refers to the non-luminous surface of the light source 10.

[0127] The optical lens assembly 20 may be arranged in the light emitting direction of the light source 10. For example, the optical lens assembly 20 may be located on the optical axis S of the optical system. When the headlight is in the projection mode, the optical lens assembly 20 is in the first state, and the optical lens assembly 20 has a first focal length F t The light emitted by the light source 10 is used to realize the projection function after passing through the optical lens assembly 20. When the headlight is in the adaptive high beam mode, the optical lens assembly 20 is in the second state, and the optical lens assembly 20 has a second focal length F a The light emitted by the light source 10 is used to realize the lighting function after passing through the optical lens assembly 20. The first focal length F t Can be larger than the second focal length F a , for example, the first focal length F t Can be greater than or equal to 27mm, the second focal length F a Can be less than or equal to 24mm.

[0128] refer to Figure 2 , in any optical system, the ratio between the image height h1 and the object height h2 is the magnification A. And the magnification A is equal to the ratio of the projection distance l to the focal length f of the optical system, that is:

[0129] A=l / f; (1)

[0130] When the magnification A remains unchanged, when the focal length f decreases, the projection distance l increases. t Greater than the second focal length F a When the optical system is in the first state, the projection distance l is smaller than the projection distance l when the optical system is in the second state, thereby increasing the illumination range of the light emitted from the optical system in the second state, which is more suitable for adaptive high beam.

[0131] Exemplarily, when the optical lens assembly 20 is in the first state, the optical lens assembly 20 has a first resolution. When the optical lens assembly 20 is in the second state, the optical lens assembly 20 has a second resolution, which is less than the first resolution. In this way, when the optical lens assembly 20 is in the first state, the optical lens assembly 20 has a higher resolution, thereby improving the accuracy of the icon projected by the headlight. It should be noted that the resolution of an optical system refers to the ability of the optical system to distinguish the details of the original object being photographed.

[0132] Exemplarily, when the optical lens group 20 is in the first state, the optical lens group 20 has a first aperture number. When the optical lens group 20 is in the second state, the optical lens group 20 has a second aperture number, and the second aperture number is smaller than the first aperture number. For example, the first aperture number may be greater than or equal to 0.7, and the second aperture number may be less than or equal to 0.67. When the optical lens group 20 switches from the first state to the second state, the second aperture number is smaller than the first aperture number. When the focal length of the optical system is constant, the smaller the aperture number, the larger the light collection angle of the optical system, thereby increasing the light throughput of the optical system, so that more light emitted from the light source 10 is emitted from the optical lens group, thereby improving the illumination brightness when the headlamp is in the adaptive high beam mode. It should be noted that the light collection angle of the optical system refers to the ability of the optical system to collect light emitted by the light source.

[0133] For example, reference Figure 3 and Figure 4 When the optical lens assembly 20 is in the first state, the optical lens assembly 20 has a first field of view angle θ1. When the optical lens assembly 20 is in the second state, the optical lens assembly 20 has a second field of view angle θ2, and the second field of view angle θ2 is greater than the first field of view angle θ1. Exemplarily, the first field of view angle θ1 may be less than or equal to 28°. The second field of view angle θ2 may be greater than or equal to 30°. When the optical lens assembly 20 switches from the first state to the second state, the field of view angle is increased, so that the light emitted from the light source 10 is more divergent, thereby increasing the illumination range when the headlamp is in the adaptive high beam mode, making the optical system more suitable for lighting.

[0134] For example, in some implementations that may include the above embodiments, the optical lens assembly 20 has a first parameter value A1, and the first parameter value A1 satisfies the following relationship:

[0135] A1=D / H / FOV; (2)

[0136] Wherein, D is the maximum aperture. The maximum aperture refers to the aperture corresponding to the maximum field of view of the lens adjacent to the light source 10. H is the image height corresponding to the maximum field of view. FOV is the field of view angle.

[0137] The first parameter value A1 may be less than or equal to 0.35. For example, the first parameter value A1 may be less than or equal to 0.2. The optical lens assembly 20 having the first parameter value A1 within this range has a smaller front port diameter, which is conducive to miniaturization of the optical system.

[0138] Exemplarily, the optical lens assembly 20 may have a second parameter value A2, and the second parameter value A2 satisfies the following relationship:

[0139] A2=|(HF*θ) / (F*θ)|; (3)

[0140] Wherein, H is the image height corresponding to the maximum field angle, F is the focal length of the optical lens assembly 20, and θ is the radian value of the maximum field angle.

[0141] The second parameter value A2 may be less than or equal to 0.07. For example, the second parameter value A2 may be less than or equal to 0.053. The optical lens assembly 20 having the second parameter value A2 within this range can ensure that the focal length is increased while the field angle and the size of the imaging surface remain unchanged, and can highlight the imaging effect of the central area of ​​the imaging surface.

[0142] Exemplarily, the optical lens assembly 20 has a third parameter value A3, and the third parameter value A3 satisfies the following relationship:

[0143] A3=BFL / TTL; (4)

[0144] Wherein, BFL is the optical back focus. The optical back focus refers to the distance between the surface of the lens farthest from the light source 10 facing away from the light source 10 and the imaging surface. TTL is the total optical length. The total optical length refers to the distance between the surface of the lens adjacent to the light source 10 facing the light source 10 and the imaging surface.

[0145] The third parameter value A3 may be less than or equal to 0.06. For example, the third parameter value A3 may be less than or equal to 0.045. The optical lens assembly 20 having the third parameter value A3 within this range can meet the special requirements of the optical back focus of the optical lens assembly 20, and can also reserve space for the installation and focusing of optical elements to avoid interference.

[0146] Exemplarily, the optical lens assembly 20 has a fourth parameter value A4, and the fourth parameter value A4 satisfies the following relationship:

[0147] A4=F / H; (5)

[0148] Wherein, F is the focal length of the optical lens assembly 20; and H is the image height corresponding to the maximum field angle.

[0149] The fourth parameter value A4 may be less than or equal to 4.3. For example, the fourth parameter value A4 may be less than or equal to 3.2. The optical lens assembly 20 having the fourth parameter value A4 within this range can control the focal length F and the image height H within a certain range, which is beneficial to improving the resolution of the optical system.

[0150] Exemplarily, the optical lens assembly 20 has a fifth parameter value A5, and the fifth parameter value A5 satisfies the following relationship:

[0151] A5=TTL / F; (6)

[0152] Wherein, F is the focal length of the optical lens assembly, and TTL is the total optical length. The ratio of the fifth parameter value A5 when the optical lens assembly 20 is in the second state to the fifth parameter value A5 when the optical lens assembly 20 is in the first state is greater than or equal to 0.7 and less than or equal to 1.4. The ratio within the above range can make the optical lens assembly 20 have a smaller volume in both the first state and the second state, which is conducive to the miniaturization of the optical system.

[0153] In some possible implementations of the present application, reference is made to Figure 3 to Figure 4 , the optical lens assembly 20 may include a fixed lens assembly and a movable lens assembly 220 spaced apart along the center line of the light source 10. The movable lens assembly 220 is configured such that when the optical lens assembly 20 is in a first state, the movable lens assembly 220 moves relative to the fixed lens assembly to a first position along a first direction, and the first direction is parallel to the optical axis of the optical system. When the optical lens assembly 20 is in a second state, the movable lens assembly 220 moves relative to the fixed lens assembly to a second position along a second direction, and the second direction is opposite to the first direction. Exemplarily, the first direction may be Figure 3 The second direction can be Figure 4 direction y shown.

[0154] Exemplarily, the fixed lens group may include a first fixed lens group 210, and the first fixed lens group 210 is closer to the light source 10 than the movable lens group 220. That is, the first fixed lens group 210 and the movable lens group 220 are arranged at intervals along the light emitting direction of the light source 10. When the optical lens group 20 is in the first state, the movable lens group 220 can move to a first position along the first direction x toward the first fixed lens group 210. When the optical lens group 20 is in the second state, the movable lens group 220 can move to a second position along the second direction y away from the first fixed lens group 210.

[0155] In some possible implementations of the embodiments of the present application, the fixed lens group may include a second fixed lens group 230, and the second fixed lens group 230 is further away from the light source 10 than the movable lens group 220. That is, the movable lens group 220 and the second fixed lens group 230 are arranged at intervals along the light emitting direction of the light source 10. When the optical lens group 20 is in the first state, the movable lens group 220 can move to a first position along the first direction x away from the second fixed lens group 230. When the optical lens group 20 is in the second state, the movable lens group 220 can move to a second position along the second direction y toward the second fixed lens group 230.

[0156] In some other possible implementations of the embodiments of the present application, refer to Figure 3 and Figure 4, the fixed mirror group may include a first fixed mirror group 210 and a second fixed mirror group 230. The first fixed mirror group 210 is closer to the light source 10 than the movable mirror group 220. The second fixed mirror group 230 is farther away from the light source 10 than the movable mirror group 220. That is to say, the first fixed mirror group 210, the movable mirror group 220 and the second fixed mirror group 230 are sequentially arranged at intervals along the light emitting direction of the light source 10. The movable mirror group 220 is configured such that when the optical lens group 20 is in the first state, the movable mirror group 220 moves to a first position along a first direction x between the first fixed mirror group 210 and the second fixed mirror group 230 toward the first fixed mirror group 210, and the first direction x is parallel to the optical axis of the optical system. The movable mirror group 220 is also configured such that when the optical lens group 20 is in the second state, the movable mirror group 220 moves to a second position along a second direction y between the first fixed mirror group 210 and the second fixed mirror group 230 toward the second fixed mirror group 230, and the second direction y is opposite to the first direction x.

[0157] Exemplarily, the first fixed mirror group 210 may include at least one lens. For example, the first fixed mirror group 210 may include one lens, two lenses, or multiple lenses. The second fixed mirror group 230 may also include at least one lens. For example, the first fixed mirror group 210 may include one lens, two lenses, or multiple lenses.

[0158] Exemplarily, the movable mirror group 220 may include at least one lens. Figure 5 , the number of lenses in the movable mirror group 220 can be one.

[0159] The number of lenses in the movable mirror group 220 may also be greater than or equal to 2. Figure 1 , Figure 3 and Figure 4 As shown, the number of lenses in the movable mirror group 220 can be three. Figure 6 As shown, the number of lenses in the movable mirror group 220 may be two. The number of lenses in the movable mirror group 220 is greater than or equal to 2, which can increase the number of adjustable variables in the optical system, thereby reducing the difficulty of optimizing the optical system.

[0160] For example, reference Figure 3 and Figure 4, the distance between the lens adjacent to the first fixed lens group 210 in the movable lens group 220 and the first fixed lens group 210 is the first distance TC2, the distance between the lens adjacent to the second fixed lens group 230 in the movable lens group 220 and the second fixed lens group 230 is the second distance TC1, and the ratio of the second distance TC1 to the first distance TC2, i.e., TC1 / TC2, is greater than or equal to 0.2 and less than or equal to 3. The first distance TC2 and the second distance TC1 within the above numerical range can control the width of the optical lens group 20 along the optical axis S, thereby facilitating the miniaturization of the optical system, and further facilitating the miniaturization of the headlamp.

[0161] For example, the sum of the focal lengths of the lenses in the movable lens assembly 220 may be less than the first focal length F of the optical lens assembly 20 when it is in the first state. t and is smaller than the second focal length F of the optical lens assembly 20 when it is in the second state. a For example Figure 7 As shown, when the number of lenses of the movable lens group 220 is three, the three lenses are L1, L2 and L3, and the focal lengths of the three lenses are F1, F2 and F3, respectively. Then, the focal powers of the three lenses are 1 / F1, 1 / F2 and 1 / F3, respectively, so that 1 / F1+1 / F2+1 / F3<1 / F t , and 1 / F1+1 / F2+1 / F3<1 / F a For another example, when the number of lenses in the movable lens group 220 is n, the n lenses are L1, L2, . . . , L n 1 / F1+1 / F2+…+1 / F n <1 / F t , and 1 / F1+1 / F2+…+1 / F n <1 / F a .

[0162] With such configuration, when the movable lens assembly 220 moves in the direction perpendicular to the optical axis S, for example, when the movable lens assembly 220 is displaced in the direction perpendicular to the optical axis S during the movement of the movable lens assembly 220, the influence of the distance moved by the movable lens assembly 220 in the direction perpendicular to the optical axis S on the light can be reduced, so that the light can smoothly transition when the optical lens assembly 20 switches states, thereby reducing the sensitivity of the optical system.

[0163] For example, reference Figure 7The movable lens group 220 may also be provided with a motor 221, a telescopic structure and a lens barrel 222. The lens of the movable lens group 220 may be installed in the lens barrel 222. The telescopic structure may include a transmission screw 223 and a transmission nut 224. The transmission screw 223 may be arranged along the optical axis S of the optical system, and one end of the transmission screw 223 is connected to the motor 221. The transmission nut 224 is sleeved on the transmission screw 223, and the transmission nut 224 is connected to the lens barrel 222. The lens barrel 222 may be slidably connected with the housing of the headlamp, etc. along the optical axis S of the optical system. When the output shaft of the motor 221 rotates, the output shaft may drive the transmission screw 223 to rotate, so that the transmission nut 224 drives the lens barrel 222 to slide on the transmission screw 223 along the optical axis S of the optical system, and then the position of the lens in the lens barrel 222 on the optical axis S of the optical system is adjusted.

[0164] The optical lens assembly 20 is further described below by taking the example that the first fixed lens assembly 210 includes one lens, the movable lens assembly 220 includes three lenses, and the second fixed lens assembly 230 includes one lens. Figure 8 , is a schematic diagram of the structure of the optical lens assembly 20 when it is in the first state. Fig. 9 , is a schematic structural diagram of the optical lens assembly 20 in the second state.

[0165] The first fixed lens group 210 may include a first positive power lens 211 , a surface of the first positive power lens 211 facing the light source 10 may be a first concave surface Surf1 , and a surface of the first positive power lens 211 facing away from the light source 10 may be a first convex surface Surf2 .

[0166] For example, the radius of the first concave surface Surf1 may be greater than or equal to 14 mm and less than or equal to 17 mm, for example, 15.0950 mm. The radius of the first convex surface Surf2 may be greater than or equal to 15 mm and less than or equal to 18 mm, for example, 16.0210 mm. The distance between the first convex surface Surf2 and the first concave surface Surf1 may be greater than or equal to 3 mm and less than or equal to 6 mm, for example, 4.7300 mm.

[0167] For example, the refractive index N of the first positive power lens 211 is d The Abbe number V of the first positive power lens 211 may be greater than or equal to 1.6 and less than or equal to 2.2, for example, may be 1.91. d It may be greater than or equal to 33 and less than or equal to 37, for example, it may be 35.26.

[0168] For example, reference Figure 8 and Fig. 9The movable lens group 220 may include a second positive power lens 225, a third positive power lens 226, and a first negative power lens 227 which are sequentially arranged in a spaced relationship along the first direction x. The surface of the second positive power lens 225 facing the first positive power lens 211 is a second concave surface Surf3, and the surface of the second positive power lens 225 facing away from the first positive power lens 211 is a second convex surface Surf4. The surface of the third positive power lens 226 facing the second positive power lens 225 is a third convex surface Surf5, and the surface of the third positive power lens 226 facing away from the second positive power lens 225 is a fourth convex surface Surf6. The surface of the first negative power lens 227 facing the third positive power lens 226 may be a third concave surface Surf7, and the surface of the first negative power lens 227 facing away from the third positive power lens 226 is a fourth concave surface Surf8.

[0169] Exemplarily, the radius of the second concave surface Surf3 may be greater than or equal to 46 mm and less than or equal to 49 mm, for example, it may be 47.8860 mm. When the optical lens assembly 20 is in the first state, the distance between the second concave surface Surf3 and the first fixed lens assembly 210 may be greater than or equal to 3 mm and less than or equal to 6 mm, for example, it may be 4.3911 mm. When the optical lens assembly 20 is in the second state, the distance between the second concave surface Surf3 and the first fixed lens assembly 210 may be greater than or equal to 5 mm and less than or equal to 8 mm, for example, it may be 6.8525 mm. The radius of the second convex surface Surf4 may be greater than or equal to 21 mm and less than or equal to 24 mm, for example, it may be 22.2180 mm. The distance between the second convex surface Surf4 and the second concave surface Surf3 may be greater than or equal to 10 mm and less than or equal to 13 mm, for example, it may be 11.0000 mm.

[0170] Exemplarily, the radius of the third convex surface Surf5 is greater than or equal to 30 mm and less than or equal to 33 mm, for example, it can be 31.2230 mm. The distance between the third convex surface Surf5 and the second convex surface Surf4 can be greater than or equal to 1 mm and less than or equal to 4 mm, for example, it can be 2.0161 mm. The radius of the fourth convex surface Surf6 can be greater than or equal to 104 mm and less than or equal to 107 mm, for example, it can be 105.4100 mm. The distance between the fourth convex surface Surf6 and the third convex surface Surf5 can be greater than or equal to 9 mm and less than or equal to 12 mm, for example, it can be 10.3600 mm.

[0171] For example, the radius of the third concave surface Surf7 may be greater than or equal to 52 mm and less than or equal to 55 mm, for example, it may be 53.5930 mm. The distance between the third concave surface Surf7 and the fourth convex surface Surf6 may be greater than or equal to 3 mm and less than or equal to 6 mm, for example, it may be 4.2952 mm. The radius of the fourth concave surface Surf8 may be greater than or equal to 27 mm and less than or equal to 30 mm, for example, it may be 28.7830 mm. The distance between the fourth concave surface Surf8 and the third concave surface Surf7 may be greater than or equal to 0 mm and less than or equal to 3 mm, for example, it may be 1.4000 mm. When the optical lens assembly 20 is in the first state, the distance between the fourth concave surface Surf8 and the second fixed lens assembly 230 may be greater than or equal to 10 mm and less than or equal to 13 mm, for example, it may be 11.2484 mm. When the optical lens assembly 20 is in the second state, the distance between the fourth concave surface Surf8 and the second fixed lens assembly 230 may be greater than or equal to 7 mm and less than or equal to 10 mm, for example, may be 8.7870 mm.

[0172] For example, the refractive index N of the second positive power lens 225 is d The Abbe number V of the second positive power lens 225 may be greater than or equal to 1.5 and less than or equal to 2.1, for example, may be 1.88. d It may be greater than or equal to 37 and less than or equal to 41, for example, it may be 39.23.

[0173] For example, the refractive index N of the third positive power lens 226 is d The Abbe number V of the third positive power lens 226 may be greater than or equal to 1.5 and less than or equal to 2, for example, may be 1.80. d Greater than or equal to 44 and less than or equal to 48, for example, may be 46.57.

[0174] For example, the refractive index N of the first negative power lens 227 is d The Abbe number V of the first negative power lens 227 may be greater than or equal to 1.5 and less than or equal to 2.1, for example, may be 1.85. d It may be greater than or equal to 22 and less than or equal to 26, for example, it may be 23.79.

[0175] Exemplarily, the second fixed lens group 230 may include a fourth positive power lens 231 , the surface of the fourth positive power lens 231 facing the movable lens group 220 is a fifth convex surface Surf9 , and the surface of the fourth positive power lens 231 facing away from the movable lens group 220 is a sixth convex surface Surf10 .

[0176] For example, the radius of the fifth convex surface Surf9 may be greater than or equal to 83 mm and less than or equal to 86 mm, for example, 84.4629 mm. The radius of the sixth convex surface Surf10 may be greater than or equal to 29 mm and less than or equal to 32 mm, for example, 30.5288 mm. The distance between the sixth convex surface Surf10 and the fifth convex surface Surf9 may be greater than or equal to 11 mm and less than or equal to 14 mm, for example, 12.8187 mm.

[0177] For example, the refractive index N of the fourth positive power lens 231 is d The Abbe number V of the fourth positive power lens 231 may be greater than or equal to 1.1 and less than or equal to 1.7, for example, may be 1.49. d It may be greater than or equal to 55 and less than or equal to 59, for example, it may be 57.44.

[0178] When the optical lens assembly 20 is in the first state, the structural parameters and material parameters of each lens in the first fixed lens assembly 210, the movable lens assembly 220 and the second fixed lens assembly 230 are shown in Table 1. When the optical lens assembly 20 is in the second state, the structural parameters and material parameters of each lens in the first fixed lens assembly 210, the movable lens assembly 220 and the second fixed lens assembly 230 are shown in Table 2. The relevant optical parameters of the optical lens assembly 20 in the first state and in the second state are shown in Table 3.

[0179] Table 1

[0180] surface Radius(mm) Distance(mm) <![CDATA[Refractive index N d > <![CDATA[Abbe number V d > Surf10 30.5288 12.8187 1.49 57.44 Surf9 -84.4629 11.2484 Surf8 -28.7830 1.4000 1.85 23.79 Surf7 53.5930 4.2952 Surf6 105.4100 10.3600 1.80 46.57 Surf5 -31.2230 0.5000 STO Infinity 1.5161 Surf4 22.2180 11.0000 1.88 39.23 Surf3 47.8860 4.3911 Surf2 16.0210 4.7300 1.91 35.26 Surf1 15.0950 2.3500 light source / /

[0181] refer to Fig.10 , is a graph of the modulation transfer function (MTF) when the optical lens assembly 20 is in the first state. Fig.10 It can be seen from the figure that the spatial frequency of the optical lens assembly 20 is below 10 lp / mm, and the average resolution within 0.5F is greater than 0.3, which can achieve a better projection effect.

[0182] refer to Fig.11 , is the MTF curve diagram when the optical lens assembly 20 is in the second state. Fig.11 It can be seen that the spatial frequency of the optical lens assembly 20 is below 1.5 lp / mm, and the average resolution within 0.5F is greater than 0.3, which has a certain resolution and can achieve a good adaptive high beam effect.

[0183] Table 2

[0184] surface Radius(mm) Distance(mm) <![CDATA[Refractive index N d > <![CDATA[Abbe number V d > Surf10 30.5288 12.8187 1.49 57.44 Surf9 -84.4629 8.7870 Surf8 -28.7830 1.4000 1.85 23.79 Surf7 53.5930 4.2952 Surf6 105.4100 10.3600 1.80 46.57 Surf5 -31.2230 0.5000 STO Infinity 1.5161 Surf4 22.2180 11.0000 1.88 39.23 Surf3 47.8860 6.8525 Surf2 16.0210 4.7300 1.91 35.26 Surf1 15.0950 2.3500 light source / /

[0185] In some other possible implementations of the embodiments of the present application, refer to Fig.12 and Fig.13 The optical system may include a third fixed lens group 240 and an insertion lens group 250. The third fixed lens group 240 is located in the light emitting direction of the light source 10. The insertion lens group 250 is configured such that when the optical lens group 20 is in the first state, the insertion lens group 250 is located at a third position, the third position is not between the third fixed lens group 240 and the light source 10, and is not in the third fixed lens group 240. The insertion lens group 250 is also configured such that when the optical lens group 20 is in the second state, the insertion lens group 250 is located at a fourth position, the fourth position is located between the third fixed lens group 240 and the light source 10, or is located in the third fixed lens group 240.

[0186] When the optical lens assembly 20 is in the second state, the insertion lens assembly 250 can be located between the third fixed lens assembly 240 and the light source 10. That is, the insertion lens assembly 250 can be closer to the light source 10, so that the insertion lens assembly 250 can cover the light emitted by the light source 10 as much as possible, thereby improving the light collection efficiency of the optical system. In addition, the insertion lens assembly 250 is closer to the light source 10, which can reduce the size of the insertion lens assembly 250, thereby facilitating the miniaturization of the optical system.

[0187] It should be noted that the light collection efficiency refers to the ratio of the light flux received by the optical system to the light flux emitted by the light source 10 .

[0188] It can be understood that when the optical lens assembly 20 is in the second state, for example Fig.14 and Fig.15 As shown, the insertion lens group 250 can also be inserted into the third fixed lens group 240 .

[0189] Table 3

[0190] Related parameters First State Second State Focal length F 28.0000 24.3000 Aperture number FNO 0.7000 0.6300 Optical total length TTL 67.9999 64.6049 Optical back focus BFL 2.3500 2.3500 Field of View FOV 27.4610 32.5520 Maximum aperture D 45.0000 45.0000 Image height H corresponding to the maximum field of view 13.2000 13.2000 <![CDATA[Focal length F of the first positive refractive power lens 211 > 198.2338 198.2338 <![CDATA[Focal length F of the second positive refractive power lens 225 > 38.9232 38.9232 <![CDATA[Focal length F of the third positive power lens 226 > 30.9087 30.9087 <![CDATA[Focal length F of the first negative focal length lens 227 > -21.8083 -21.8083 <![CDATA[Focal length F of the fourth positive power lens 231 > 47.2172 47.2172 <![CDATA[First parameter value A1]]> 0.12410. 0.1047 <![CDATA[Second parameter value A2]]> 0.0164 0.0438 <![CDATA[Third parameter value A3]]> 0.0346 0.0346 <![CDATA[Fourth parameter value A4]]> 2.1212 1.8409

[0191] Exemplarily, the third fixed lens group 240 may include at least two lenses. Figure 12 to Figure 14 , the third fixed lens group 240 may include four lenses. Fig.15 , the third fixed lens group 240 may include three lenses.

[0192] Exemplarily, the insert lens assembly 250 includes at least one lens. Figure 12 to Figure 14 , the insert lens assembly 250 may include a lens. Fig.15 , the insert lens assembly 250 may include two lenses.

[0193] For example, refer to Figure 12 to Figure 14 , when the lens assembly 250 includes a lens L x , the lens L x The focal length is Fx , F x Smaller than the first focal length F t , and is smaller than the second focal length F a That is, 0<F x / F t <1, and 0<F x / F a <1.

[0194] Exemplarily, when the insertion lens assembly 250 includes a plurality of lenses, the sum of the focal lengths of the lenses in the insertion lens assembly 250 is greater than the first focal length F of the optical lens assembly 20 when it is in the first state. t , and is greater than the second focal length F of the optical lens assembly 20 when it is in the second state a For example, refer to Fig.15 The insertion lens assembly 250 includes two lenses L1′ and L2′, the focal lengths of the two lenses L1′ and L2′ are F1′ and F2′ respectively, and the sum of F1′ and F2′ is less than the first focal length F t , and is smaller than the second focal length F a That is, 0<F t / (F1′+F2′)<1, and 0<F a / (F1′+F2′)<1. For another example, when the number of lenses inserted into the lens assembly 250 is n, ∑F n ′=F1′+F2′+…+F n ′,0<F t / ∑F n '<1,and 0<F a / ∑F n ′<1.

[0195] With such arrangement, when the insertion lens group 250 is displaced in a direction perpendicular to the optical axis S during the process of being inserted between the third fixed lens group 240 and the light source 10, or inserted into the third fixed lens group 240, the influence of the distance moved by the insertion lens group 250 in the direction perpendicular to the optical axis S on the light can be reduced, so that the light can smoothly transition when the optical lens group 20 switches between states, thereby reducing the sensitivity of the optical system.

[0196] The following further describes the optical lens assembly 20 by taking the third fixed lens assembly 240 including four lenses and the insertion lens assembly 250 including one lens as an example. Fig.16 , is a schematic diagram of the structure of the optical lens assembly 20 when it is in the first state. Fig.17 , is a schematic structural diagram of the optical lens assembly 20 in the second state.

[0197] refer to Fig.16 and Fig.17The third fixed lens group 240 may include a fifth positive power lens 241, a sixth positive power lens 242, a second negative power lens 243 and a seventh positive power lens 244 which are sequentially arranged in a spaced relationship along the light emitting direction of the light source 10. The surface of the fifth positive power lens 241 facing the light source 10 is a fifth concave surface Surf11, and the surface of the fifth positive power lens 241 facing away from the light source 10 is a seventh convex surface Surf12. The surface of the sixth positive power lens 242 facing the fifth positive power lens 241 is an eighth convex surface Surf13. The surface of the sixth positive power lens 242 facing away from the fifth positive power lens 241 is a ninth convex surface Surf14. The surface of the second negative power lens 243 facing the sixth positive power lens 242 is a sixth concave surface Surf15, and the surface of the second negative power lens 243 facing away from the sixth positive power lens 242 is a seventh concave surface Surf16. The surface of the seventh positive power lens 244 facing the second negative power lens 243 is a tenth convex surface Surf17. The surface of the seventh positive power lens 244 facing away from the second negative power lens 243 is an eleventh convex surface Surf18.

[0198] For example, the radius of the fifth concave surface Surf11 may be greater than or equal to 29 mm and less than or equal to 32 mm, for example, 30.4920 mm. The radius of the seventh convex surface Surf12 may be greater than or equal to 17 mm and less than or equal to 20 mm, for example, 18.8691 mm. The distance between the seventh convex surface Surf12 and the fifth concave surface Surf11 may be greater than or equal to 8 mm and less than or equal to 11 mm, for example, 9.9587 mm.

[0199] Exemplarily, the radius of the eighth convex surface Surf13 may be greater than or equal to 39 mm and less than or equal to 42 mm, for example, it may be 40.5180 mm. The distance between the eighth convex surface Surf13 and the seventh convex surface Surf12 may be greater than or equal to 0 and less than or equal to 3 mm, for example, it may be 0.5000 mm. The radius of the ninth convex surface Surf14 may be greater than or equal to 38 mm and less than or equal to 41 mm. The distance between the ninth convex surface Surf14 and the eighth convex surface Surf13 may be greater than or equal to 10 mm and less than or equal to 13 mm, for example, it may be 11.6297 mm.

[0200] For example, the radius of the sixth concave surface Surf15 may be greater than or equal to 10 mm and less than or equal to 13 mm, for example, it may be 11.2634 mm. The distance between the sixth concave surface Surf15 and the ninth convex surface Surf14 may be greater than or equal to 5 mm and less than or equal to 8 mm, for example, it may be 6.3410 mm. The radius of the seventh concave surface Surf16 may be greater than or equal to 588 mm and less than or equal to 591 mm, for example, it may be 589.0934 mm. The distance between the seventh concave surface Surf16 and the sixth concave surface Surf15 may be greater than or equal to 3 mm and less than or equal to 6 mm, for example, it may be 4.2967 mm.

[0201] Exemplarily, the radius of the tenth convex surface Surf17 may be greater than or equal to 21 mm and less than or equal to 24 mm, for example, it may be 22.1269 mm. The distance between the tenth convex surface Surf17 and the seventh concave surface Surf16 may be greater than or equal to 1 mm and less than or equal to 4 mm, for example, it may be 2.2566 mm. The radius of the eleventh convex surface Surf18 may be greater than or equal to 28 mm and less than or equal to 31 mm, for example, it may be 29.1203 mm. The distance between the eleventh convex surface Surf18 and the tenth convex surface Surf17 may be greater than or equal to 14 mm and less than or equal to 17 mm, for example, it may be 15.1612 mm.

[0202] For example, the refractive index N of the fifth positive power lens 241 is d The Abbe number V of the fifth positive power lens 241 may be greater than or equal to 1.3 and less than or equal to 1.9, for example, may be 1.62. d It may be greater than or equal to 58 and less than or equal to 62, for example, it may be 60.37.

[0203] For example, the refractive index N of the sixth positive power lens 242 is d The Abbe number V of the sixth positive power lens 242 may be greater than or equal to 1.4 and less than or equal to 2.0, for example, may be 1.73. d It may be greater than or equal to 52 and less than or equal to 56, for example, it may be 54.67.

[0204] For example, the refractive index N of the second negative power lens 243 is d The Abbe number V of the second negative power lens 243 may be greater than or equal to 1.2 and less than or equal to 1.8, for example, may be 1.58. d It may be greater than or equal to 25 and less than or equal to 29, for example, it may be 27.55.

[0205] For example, the refractive index N of the seventh positive power lens 244 is dThe Abbe number V of the seventh positive power lens 244 may be greater than or equal to 1.1 and less than or equal to 1.7, for example, 1.49. d It may be greater than or equal to 54 and less than or equal to 58, for example, it may be 56.07.

[0206] refer to Fig.16 and Fig.17 The inserted lens group 250 may include an eighth positive power lens 251, which is located on the side of the third fixed lens group 240 facing the light source 10, the surface of the eighth positive power lens 251 facing the light source 10 is an eighth concave surface Surf19, and the surface of the eighth positive power lens 251 facing away from the light source 10 is a twelfth convex surface Surf20.

[0207] Exemplarily, the radius of the eighth concave surface Surf19 may be greater than or equal to 47 mm and less than or equal to 50 mm, for example, it may be 48.4989 mm. The radius of the twelfth convex surface Surf20 may be greater than or equal to 9 mm and less than or equal to 12 mm, for example, it may be 10.7863 mm. The distance between the twelfth convex surface Surf20 and the eighth concave surface Surf19 may be greater than or equal to 2 mm and less than or equal to 5 mm, for example, it may be 3.0000 mm. The distance between the twelfth convex surface Surf20 and the third fixed mirror group 240 may be greater than or equal to 3 mm and less than or equal to 6 mm, for example, it may be 4.4928 mm.

[0208] Exemplarily, the refractive index N of the eighth positive power lens 251 is d The Abbe number V of the eighth positive power lens 251 may be greater than or equal to 1.3 and less than or equal to 1.9, for example, may be 1.62. d It may be greater than or equal to 58 and less than or equal to 62, for example, it may be 60.37.

[0209] When the optical lens assembly 20 is in the first state, the structural parameters and material parameters of each lens in the third fixed lens assembly 240 and the insertion lens assembly 250 are shown in Table 4. When the optical lens assembly 20 is in the second state, the structural parameters and material parameters of each lens in the third fixed lens assembly 240 and the insertion lens assembly 250 are shown in Table 5. The relevant optical parameters of the optical lens assembly 20 in the first state and in the second state are shown in Table 6.

[0210] refer to Fig.18 , is the MTF curve diagram when the optical lens assembly 20 is in the first state. Fig.18 It can be seen from the figure that the spatial frequency of the optical lens assembly 20 is below 10 lp / mm, and the average resolution within 0.5F is greater than 0.3, which can achieve a better projection effect.

[0211] refer to Fig.19 , is the MTF curve diagram when the optical lens assembly 20 is in the second state. Fig.19 It can be seen that the spatial frequency of the optical lens assembly 20 is below 1.5 lp / mm, and the average resolution within 0.5F is greater than 0.3, which has a certain resolution and can achieve a good adaptive high beam effect.

[0212] The second aspect of the embodiment of the present application provides a headlamp, comprising the optical system of the embodiment of the present application. Since the headlamp of the embodiment of the present application comprises the optical system of the embodiment of the present application, the headlamp also has the advantages of the optical system of the embodiment of the present application, which will not be described in detail here.

[0213] Table 4

[0214] Radius(mm) Distance(mm) <![CDATA[Refractive index N d > <![CDATA[Abbe number V d > Surf18 29.1203 15.1612 1.49 56.07 Surf17 -22.1269 1.8463 STO Infinity 0.4103 Surf16 589.0934 4.2967 1.58 27.55 Surf15 11.2634 6.3410 Surf14 39.8484 11.6297 1.73 54.67 Surf13 -40.5180 0.5000 Surf12 18.8691 9.9587 1.62 60.37 Surf11 30.4920 8.7740 light source / /

[0215] Table 5

[0216] Radius(mm) Distance(mm) <![CDATA[Refractive index N d > <![CDATA[Abbe number V d <!-- 17 -->]]> Surf18 29.1203 15.1612 1.49 56.07 Surf17 -22.1269 1.8463 STO Infinity 0.4103 Surf16 589.0934 4.2967 1.58 27.55 Surf15 11.2634 6.3410 Surf14 39.8484 11.6297 1.73 54.67 Surf13 -40.5180 0.5000 Surf12 18.8691 9.9587 1.62 60.37 Surf11 30.4920 4.4928 Surf20 10.7863 3.0000 1.62 60.37 Surf19 48.4989 1.5850 light source / /

[0217] Table 6

[0218] Related parameters First State Second State Focal length F 27.8973 23.5378 Aperture number FNO 0.7000 0.6690 Optical total length TTL 58.5739 59.0228 Optical back focus BFL 9.0439 2.0000 Field of View FOV 27.1013 30.9848 Maximum aperture D 42.8828 38.8804 Image height H corresponding to the maximum field of view 13.2000 13.2000 <![CDATA[Focal length F of the fifth positive power lens 241 > 59.7612 59.7612 <![CDATA[Focal length F of the sixth positive power lens 242 > 29.1996 29.1996 <![CDATA[Focal length F of the second negative power lens 243 > -19.5139 -19.5139 <![CDATA[Focal length F of the seventh positive refractive power lens 244 > 28.0709 28.0709 <![CDATA[Focal length F of the eighth positive refractive power lens 251 > - 21.5958 <![CDATA[First parameter value A1A1]]> 0.1199 0.0951 <![CDATA[Second parameter value A2A2]]> 0.0003 0.0370 The third parameter value A3 0.1544 0.0339 Fourth parameter value A4 2.1134 1.7832

[0219] A third aspect of the present application provides a method for controlling a headlamp, which is applied to a vehicle. Exemplarily, the vehicle may include the headlamp as described above, and a controller. The headlamp is electrically connected to the controller. The controller may be used to execute the control method. Fig. 20 , the method comprising:

[0220] S100: Acquire a mode switching instruction, where the mode switching instruction is used to instruct to switch the working mode of the headlamp to a projection mode or an adaptive high beam mode.

[0221] Exemplarily, the controller may obtain a mode switching instruction. The mode switching instruction is used to instruct to switch the working mode of the headlight to a projection mode or an adaptive high beam mode. The mode switching instruction may be generated by a user pressing a control button equipped in the vehicle, or by a user touching a control in a mobile phone APP.

[0222] S200: According to the mode switching instruction, switch the optical lens assembly of the headlamp to a state corresponding to the mode switching instruction, where the state includes a first state or a second state.

[0223] After receiving the mode switching instruction, the controller switches the optical lens assembly 20 of the headlamp to a state corresponding to the mode switching instruction according to the mode switching instruction.

[0224] Exemplarily, when the optical lens assembly 20 includes a first fixed lens assembly 210, a movable lens assembly 220, and a second fixed lens assembly 230 which are sequentially arranged at intervals along the light emitting direction of the light source 10, if the mode switching instruction is used to instruct to switch the working mode of the headlamp to the projection mode, the movable lens assembly 220 of the optical lens assembly 20 is controlled to move to a first position along the first direction x toward the first fixed lens assembly 210, so as to switch the optical lens assembly 20 to the first state, so that the optical lens assembly 20 is in the projection mode.

[0225] If the mode switching instruction is used to instruct to switch the working mode of the headlamp to the adaptive high beam mode, the movable lens group 220 of the optical lens group 20 is controlled to move to the second position along the second direction y toward the second fixed lens group 230 to switch the optical lens group 20 to the second state, so that the optical lens group 20 is in the adaptive high beam mode.

[0226] Exemplarily, when the optical lens assembly 20 includes a third fixed lens assembly 240 and an insertion lens assembly 250, and the third fixed lens assembly 240 is located in the light emitting direction of the light source 10, if the mode switching instruction is used to instruct to switch the working mode of the headlamp to the projection mode, the insertion lens assembly 250 of the optical lens assembly 20 is controlled to be in the third position, and the third position is not between the third fixed lens assembly 240 of the optical lens assembly 20 and the light source 10, and is not in the third fixed lens assembly 240, so as to switch the optical lens assembly 20 to the first state, so that the optical lens assembly 20 is in the projection mode.

[0227] If the mode switching instruction is used to instruct to switch the working mode of the headlamp to the adaptive high beam mode, the inserted lens assembly 250 is controlled to be in the fourth position, and the fourth position is between the third fixed lens assembly 240 of the optical lens assembly 20 and the light source 10, or is in the third fixed lens assembly 240, so as to switch the optical lens assembly 20 to the second state, so that the optical lens assembly 20 is in the adaptive high beam mode.

[0228] The control method of the headlamp of the embodiment of the present application can control the optical lens group to switch between the first state and the second state through the mode switching instruction, so that the headlamp can switch between the projection mode and the adaptive high beam mode. Compared with the related art that needs to control two sets of optical systems to achieve the switching between the projection mode and the adaptive high beam mode, the control method of the embodiment of the present application only needs to set one mode switching instruction, which simplifies the control steps.

[0229] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical system, characterized in that: The invention comprises a light source and an optical lens group, wherein the optical lens group is located in the light emitting direction of the light source, and the optical lens group has a first state and a second state. When the optical lens group is in the first state, it is configured to have a first focal length, so that the light emitted by the light source is used for projection after passing through the optical lens group; when the optical lens group is in the second state, it is configured to have a second focal length, so that the light emitted by the light source is used for illumination after passing through the optical lens group.

2. The optical system according to claim 1, characterized in that The first focal length is greater than the second focal length.

3. The optical system according to claim 2, characterized in that The first focal length is greater than or equal to 27 mm, and the second focal length is less than or equal to 24 mm.

4. The optical system according to claim 1, characterized in that When the optical lens set is in a first state, the optical lens set has a first resolution; when the optical lens set is in a second state, the optical lens set has a second resolution, which is smaller than the first resolution.

5. The optical system according to claim 1, characterized in that When the optical lens assembly is in a first state, the optical lens assembly has a first aperture number; when the optical lens assembly is in a second state, the optical lens assembly has a second aperture number, and the second aperture number is smaller than the first aperture number.

6. The optical system according to claim 5, characterized in that The first aperture number is greater than or equal to 0.7, and the second aperture number is less than or equal to 0.

67.

7. The optical system according to claim 1, characterized in that When the optical lens assembly is in a first state, the optical lens assembly has a first field of view angle; when the optical lens assembly is in a second state, the optical lens assembly has a second field of view angle, and the second field of view angle is greater than the first field of view angle.

8. The optical system according to claim 7, characterized in that The first viewing angle is less than or equal to 28°, and the second viewing angle is greater than or equal to 30°.

9. The optical system according to claim 1, characterized in that The optical lens assembly has a first parameter value A1, and the first parameter value A1 satisfies the following relationship: A1 = D / H / FOV; Where D is the maximum aperture, H is the image height corresponding to the maximum field of view, and FOV is the field of view angle; The first parameter value A1 is less than or equal to 0.

35.

10. The optical system according to claim 1, characterized in that The optical lens assembly has a second parameter value A2, and the second parameter value A2 satisfies the following relationship: A2 = (HF*θ)(F*θ); Wherein, H is the image height corresponding to the maximum field of view angle; F is the focal length of the optical lens assembly; θ is the radian value of the maximum field of view angle; The second parameter value A2 is less than or equal to 0.

07.

11. The optical system according to claim 1, characterized in that The optical lens assembly has a third parameter value A3, and the third parameter value A3 satisfies the following relationship: A3 = BFLTTL; Among them, BFL is the optical back focus, TTL is the total optical length; The third parameter value A3 is less than or equal to 0.

06.

12. The optical system according to claim 1, characterized in that The optical lens assembly has a fourth parameter value A4, and the fourth parameter value A4 satisfies the following relationship: A4=FH; Wherein, F is the focal length of the optical lens assembly; H is the image height corresponding to the maximum field of view; The fourth parameter value A4 is less than or equal to 4.

3.

13. The optical system according to claim 1, characterized in that The optical lens assembly has a fifth parameter value A5, and the fifth parameter value A5 satisfies the following relationship: A5=TTLF; Wherein, F is the focal length of the optical lens assembly, and TTL is the total optical length; A ratio of a fifth parameter value A5 when the optical lens assembly is in the second state to a fifth parameter value A5 when the optical lens assembly is in the first state is greater than or equal to 0.7 and less than or equal to 1.

4.

14. The optical system according to any one of claims 1 to 13, characterized in that: The optical lens group includes a fixed lens group and a movable lens group arranged at intervals along the center line of the light source; The movable mirror group is configured such that when the optical lens group is in a first state, the movable mirror group moves to a first position relative to the fixed mirror group along a first direction, and the first direction is parallel to the optical axis of the optical system; when the optical lens group is in a second state, the movable mirror group moves to a second position relative to the fixed mirror group along a second direction, and the second direction is opposite to the first direction.

15. The optical system according to claim 14, characterized in that The fixed mirror group includes a first fixed mirror group and / or a second fixed mirror group, the first fixed mirror group is closer to the light source than the movable mirror group; the second fixed mirror group is farther away from the light source than the movable mirror group; The movable mirror group is configured so that when the optical lens group is in a first state, the movable mirror group moves toward the light source to the first position; and when the optical lens group is in a second state, the movable mirror group moves away from the light source to the second position.

16. The optical system according to claim 15, characterized in that The movable mirror group includes at least one lens.

17. The optical system according to claim 16, characterized in that The number of lenses in the movable mirror group is greater than or equal to 2.

18. The optical system according to claim 15, characterized in that The first fixed mirror group includes at least one lens; and / or the second fixed mirror group includes at least one lens.

19. The optical system according to claim 15, characterized in that The distance between the lens adjacent to the first fixed mirror group in the movable mirror group and the first fixed mirror group is a first distance, the distance between the lens adjacent to the second fixed mirror group in the movable mirror group and the second fixed mirror group is a second distance, and the ratio of the second distance to the first distance is greater than or equal to 0.2 and less than or equal to 3.

20. The optical system according to claim 15, characterized in that The sum of the optical powers of the lenses in the movable lens group is smaller than the reciprocal of a first focal length when the optical lens group is in the first state, and smaller than the reciprocal of a second focal length when the optical lens group is in the second state.

21. The optical system according to claim 15, characterized in that The first fixed lens group includes a first positive power lens, a surface of the first positive power lens facing the light source is a first concave surface, and a surface of the first positive power lens facing away from the light source is a first convex surface.

22. The optical system according to claim 21, characterized in that The radius of the first concave surface is greater than or equal to 14 mm and less than or equal to 17 mm; the radius of the first convex surface is greater than or equal to 15 mm and less than or equal to 18 mm; the distance between the first convex surface and the first concave surface is greater than or equal to 3 mm and less than or equal to 6 mm.

23. The optical system according to claim 21, characterized in that The refractive index of the first positive power lens is greater than or equal to 1.6 and less than or equal to 2.2; The Abbe number of the first positive power lens is greater than or equal to 33 and less than or equal to 37.

24. The optical system according to claim 15, characterized in that The movable lens group comprises a second positive power lens, a third positive power lens and a first negative power lens which are sequentially arranged in intervals along the first direction; The surface of the second positive power lens facing the first fixed lens group is a second concave surface, and the surface of the second positive power lens facing away from the first fixed lens group is a second convex surface; The surface of the third positive power lens facing the second positive power lens is a third convex surface, and the surface of the third positive power lens facing away from the second positive power lens is a fourth convex surface; The surface of the first negative power lens facing the third positive power lens is a third concave surface, and the surface of the first negative power lens facing away from the third positive power lens is a fourth concave surface.

25. The optical system according to claim 24, characterized in that The radius of the second concave surface is greater than or equal to 46 mm and less than or equal to 49 mm; when the optical lens assembly is in the first state, the distance between the second concave surface and the first fixed lens assembly is greater than or equal to 3 mm and less than or equal to 6 mm; when the optical lens assembly is in the second state, the distance between the second concave surface and the first fixed lens assembly is greater than or equal to 5 mm and less than or equal to 8 mm; the radius of the second convex surface is greater than or equal to 21 mm and less than or equal to 24 mm; the distance between the second convex surface and the second concave surface is greater than or equal to 10 mm and less than or equal to 13 mm; And / or, the radius of the third convex surface is greater than or equal to 30 mm and less than or equal to 33 mm; the distance between the third convex surface and the second convex surface is greater than or equal to 1 mm and less than or equal to 4 mm; the radius of the fourth convex surface is greater than or equal to 104 mm and less than or equal to 107 mm; the distance between the fourth convex surface and the third convex surface is greater than or equal to 9 mm and less than or equal to 12 mm; And / or, the radius of the third concave surface is greater than or equal to 52 mm and less than or equal to 55 mm; the distance between the third concave surface and the fourth convex surface is greater than or equal to 3 mm and less than or equal to 6 mm; the radius of the fourth concave surface is greater than or equal to 27 mm and less than or equal to 30 mm; the distance between the fourth concave surface and the third concave surface is greater than or equal to 0 mm and less than or equal to 3 mm; when the optical lens assembly is in the first state, the distance between the fourth concave surface and the second fixed lens assembly is greater than or equal to 10 mm and less than or equal to 13 mm; when the optical lens assembly is in the second state, the distance between the fourth concave surface and the second fixed lens assembly is greater than or equal to 7 mm and less than or equal to 10 mm.

26. The optical system according to claim 24, characterized in that The refractive index of the second positive power lens is greater than or equal to 1.5 and less than or equal to 2.1; the Abbe number of the second positive power lens is greater than or equal to 37 and less than or equal to 41; And / or, the refractive index of the third positive power lens is greater than or equal to 1.5 and less than or equal to 2; the Abbe number of the third positive power lens is greater than or equal to 44 and less than or equal to 48; And / or, the refractive index of the first negative optical focal length lens is greater than or equal to 1.5 and less than or equal to 2.1; the Abbe number of the first negative optical focal length lens is greater than or equal to 22 and less than or equal to 26.

27. The optical system according to claim 15, characterized in that The second fixed lens group includes a fourth positive power lens, a surface of the fourth positive power lens facing the movable lens group is a fifth convex surface, and a surface of the fourth positive power lens facing away from the movable lens group is a sixth convex surface.

28. The optical system according to claim 27, characterized in that The radius of the fifth convex surface is greater than or equal to 83 mm and less than or equal to 86 mm; the radius of the sixth convex surface is greater than or equal to 29 mm and less than or equal to 32 mm; the distance between the sixth convex surface and the fifth convex surface is greater than or equal to 11 mm and less than or equal to 14 mm.

29. The optical system according to claim 27, characterized in that The refractive index of the fourth positive power lens is greater than or equal to 1.1 and less than or equal to 1.7; the Abbe number of the fourth positive power lens is greater than or equal to 55 and less than or equal to 59.

30. The optical system according to any one of claims 1 to 13, characterized in that: The optical system includes a third fixed lens group and an insertion lens group; the third fixed lens group is located in the light emitting direction of the light source; the insertion lens group is configured so that when the optical lens group is in the first state, the insertion lens group is located in a third position, the third position is not between the third fixed lens group and the light source, and is not within the third fixed lens group; the insertion lens group is further configured so that when the optical lens group is in the second state, the insertion lens group is located in a fourth position, the fourth position is located between the third fixed lens group and the light source, or is located within the third fixed lens group.

31. The optical system according to claim 30, characterized in that When the optical lens assembly is in the second state, the insertion lens assembly is located between the third fixed lens assembly and the light source.

32. The optical system according to claim 30, characterized in that The third fixed lens group includes at least two lenses; and / or the insertion lens group includes at least one lens.

33. The optical system according to claim 30, characterized in that The insertion lens assembly includes a lens, the focal length of which is smaller than a first focal length of the optical lens assembly when the optical lens assembly is in a first state, and smaller than a second focal length of the optical lens assembly when the optical lens assembly is in a second state.

34. The optical system according to claim 30, characterized in that The sum of the focal lengths of the lenses in the inserted lens assembly is greater than a first focal length when the optical lens assembly is in a first state, and is greater than a second focal length when the optical lens assembly is in a second state.

35. The optical system according to claim 30, characterized in that The third fixed lens group comprises a fifth positive power lens, a sixth positive power lens, a second negative power lens and a seventh positive power lens which are sequentially arranged in an interval along the light emitting direction of the light source; The surface of the fifth positive power lens facing the light source is a fifth concave surface, and the surface of the fifth positive power lens facing away from the light source is a seventh convex surface; The surface of the sixth positive power lens facing the fifth positive power lens is an eighth convex surface; the surface of the sixth positive power lens facing away from the fifth positive power lens is a ninth convex surface; The surface of the second negative power lens facing the sixth positive power lens is a sixth concave surface, and the surface of the second negative power lens facing away from the sixth positive power lens is a seventh concave surface; The surface of the seventh positive power lens facing the second negative power lens is the tenth convex surface; the surface of the seventh positive power lens facing away from the second negative power lens is the eleventh convex surface.

36. The optical system according to claim 35, characterized in that The radius of the fifth concave surface is greater than or equal to 29 mm and less than or equal to 32 mm; the radius of the seventh convex surface is greater than or equal to 17 mm and less than or equal to 20 mm; the distance between the seventh convex surface and the fifth concave surface is greater than or equal to 8 mm and less than or equal to 11 mm; and / or, the radius of the eighth convex surface is greater than or equal to 39 mm and less than or equal to 42 mm; the distance between the eighth convex surface and the seventh convex surface is greater than or equal to 0 and less than or equal to 3 mm; the radius of the ninth convex surface is greater than or equal to 38 mm and less than or equal to 41 mm; the distance between the ninth convex surface and the eighth convex surface is greater than or equal to 10 mm and less than or equal to 13 mm; And / or, the radius of the sixth concave surface is greater than or equal to 10 mm and less than or equal to 13 mm; the distance between the sixth concave surface and the ninth convex surface is greater than or equal to 5 mm and less than or equal to 8 mm; the radius of the seventh concave surface is greater than or equal to 588 mm and less than or equal to 591 mm; the distance between the seventh concave surface and the sixth concave surface is greater than or equal to 3 mm and less than or equal to 6 mm; And / or, the radius of the tenth convex surface is greater than or equal to 21 mm and less than or equal to 24 mm; the distance between the tenth convex surface and the seventh concave surface is greater than or equal to 1 mm and less than or equal to 4 mm; the radius of the eleventh convex surface is greater than or equal to 28 mm and less than or equal to 31 mm; the distance between the eleventh convex surface and the tenth convex surface is greater than or equal to 14 mm and less than or equal to 17 mm.

37. The optical system according to claim 35, characterized in that The refractive index of the fifth positive power lens is greater than or equal to 1.3 and less than or equal to 1.9; the Abbe number of the fifth positive power lens is greater than or equal to 58 and less than or equal to 62; And / or, the refractive index of the sixth positive power lens is greater than or equal to 1.4 and less than or equal to 2.0; the Abbe number of the sixth positive power lens is greater than or equal to 52 and less than or equal to 56; And / or, the refractive index of the second negative power lens is greater than or equal to 1.2 and less than or equal to 1.8; the Abbe number of the second negative power lens is greater than or equal to 25 and less than or equal to 29; And / or, the refractive index of the seventh positive power lens is greater than or equal to 1.1 and less than or equal to 1.7; the Abbe number of the seventh positive power lens is greater than or equal to 54 and less than or equal to 58.

38. The optical system according to claim 30, characterized in that The inserted lens group includes an eighth positive power lens, which is located on the side of the third fixed lens group facing the light source, the surface of the eighth positive power lens facing the light source is an eighth concave surface, and the surface of the eighth positive power lens facing away from the light source is a twelfth convex surface.

39. The optical system according to claim 38, characterized in that The radius of the eighth concave surface is greater than or equal to 47 mm and less than or equal to 50 mm; The radius of the twelfth convex surface is greater than or equal to 9 mm and less than or equal to 12 mm, the distance between the twelfth convex surface and the eighth concave surface is greater than or equal to 2 mm and less than or equal to 5 mm; the distance between the twelfth convex surface and the third fixed mirror group is greater than or equal to 3 mm and less than or equal to 6 mm.

40. The optical system according to claim 38, characterized in that The refractive index of the eighth positive power lens is greater than or equal to 1.3 and less than or equal to 1.9; the Abbe number of the eighth positive power lens is greater than or equal to 58 and less than or equal to 62.

41. A headlamp, characterized in that: Comprising an optical system as described in any one of claims 1-40.

42. A method for controlling a headlamp, characterized in that: Applied to a vehicle, the vehicle comprising the headlamp according to claim 41, the method comprising: Acquire a mode switching instruction, wherein the mode switching instruction is used to instruct to switch the working mode of the headlamp to a projection mode or an illumination mode; According to the mode switching instruction, the optical lens assembly of the headlamp is switched to a state corresponding to the mode switching instruction, wherein the state includes a first state or a second state.

43. The method according to claim 42, characterized in that The step of switching the optical lens assembly of the headlamp to a state corresponding to the mode switching instruction according to the mode switching instruction includes: If the mode switching instruction is used to instruct to switch the working mode of the headlamp to the projection mode, controlling the movable lens group of the optical lens group to move to a first position along a first direction relative to the fixed lens group, so as to switch the optical lens group to the first state; If the mode switching instruction is used to instruct to switch the working mode of the headlamp to the lighting mode, controlling the movable lens group of the optical lens group to move to a second position along a second direction relative to the fixed lens group, so as to switch the optical lens group to the second state; Wherein, the optical lens group includes a fixed lens group and a movable lens group which are arranged at intervals along the center line of the light source.

44. The method according to claim 42, characterized in that The step of switching the optical lens assembly of the headlamp to a state corresponding to the mode switching instruction according to the mode switching instruction includes: If the mode switching instruction is used to instruct to switch the working mode of the headlamp to the projection mode, controlling the insertion lens assembly of the optical lens assembly to be in a third position to switch the optical lens assembly to the first state; If the mode switching instruction is used to instruct to switch the working mode of the headlamp to the lighting mode, controlling the insertion lens assembly to be in the fourth position to switch the optical lens assembly to the second state; Wherein, the optical lens group includes a third fixed lens group and an insertion lens group; the third fixed lens group is located in the light emitting direction of the light source.

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