Optical adjustment assembly, lens assembly, and vehicle-mounted projection lamp

Abstract

An optical adjustment assembly, a lens assembly, and a vehicle-mounted projection lamp. The lens assembly comprises an object surface (1), an image surface (10), a lens unit (8) provided between the object surface (1) and the image surface (10), and the optical adjustment assembly. The optical adjustment assembly comprises: a driving mechanism and an optical element unit (2), wherein the driving mechanism is configured to drive the optical element unit (2) to be inserted between the object surface (1) and the lens unit (8), and the optical element unit (2) is configured to change an optical path length between the object surface (1) and a principal plane of the lens unit (8); or the driving mechanism is configured to drive the optical element unit (2) to be inserted between the lens unit (8) and the image surface (10), and the optical element unit (2) is configured to change the focal length of the lens unit (8), so that the object surface (1) is imaged onto the image surface (10) at different physical distances from the principal plane of the lens unit (8). Without changing the physical distance between the object surface (1) and the lens unit (8), the optical adjustment assembly can realize clear imaging on the image surface (10) at different distances with a low cost and a simple structure.

Description

Optical adjustment assembly, lens assembly and vehicle-mounted projection lamp Technical Field

[0001] The present application relates to a vehicle-mounted lamp, and in particular, to an optical adjustment assembly, a lens assembly and a vehicle-mounted projection lamp. Background Art

[0002] Digital projection headlights offer high definition and resolution. Powerful display chips enable controllable pixel switching, creating pixel-level projection icons such as zebra crossings and guide lines, effectively improving nighttime driving safety. Icons projected by digital projection headlights must be clearly visible to drivers and other road users, requiring high-quality lenses. Furthermore, projection clarity must be maintained at varying distances for different application scenarios. For near-field welcome functions, such as near-field interaction with the driver at 4 meters, and for driving functions, such as projecting navigation symbols at 8-15 meters, clarity is required for both near and far fields.

[0003] To achieve clear imaging at varying distances in digital projection headlights, focusing is typically achieved by moving the lens assembly. For example, in patent CN 220064481U, a motor or other drive mechanism drives some lenses to move relative to each other, changing the spacing between the lenses to achieve the focal length of the zoom system. This, in turn, changes the back focus of the lens system, enabling clear photography or projection at varying object distances. However, this lens structure is complex, heavy, and bulky, resulting in high manufacturing costs. In patent CN 115793177A, the focal length of the zoom lens is electrically adjusted, enabling high-definition photography or projection at varying working object distances. However, this solution utilizes voltage-driven zoom lenses, which are technically difficult, require high dimensional precision for the optical mechanism, have poor mass production capabilities, and are expensive to manufacture.

[0004] Based on the above reasons, it is difficult for the existing technology to effectively ensure that the structure of the lens assembly is simple and has good performance.

[0005] Summary of the Invention

[0006] The problem to be solved in the first aspect of the present application is to provide an optical adjustment component, which, through a driving mechanism, inserts an optical element unit between the object plane and the lens unit to change the optical path between the object plane and the main plane of the lens unit, or inserts it between the image plane and the lens unit to change the focal length of the lens unit, thereby achieving clear imaging of image planes at different distances with a lower cost and a simple structure.

[0007] The problem to be solved in the second aspect of the present application is to provide a lens assembly that can achieve clear imaging of image planes at different distances at a low cost and with a simple structure, and has a simple structure and convenient operation.

[0008] In addition, the problem to be solved in the third aspect of this application is to provide a vehicle-mounted projection lamp, which has a simple structure, low manufacturing cost, convenient operation, and good use effect.

[0009] In order to solve the above technical problems, the first aspect of the present application provides an optical adjustment assembly, which is applied to a lens assembly, wherein the lens assembly includes an object plane, an image plane, a lens unit arranged between the object plane and the image plane, and the optical adjustment assembly, wherein the optical adjustment assembly includes:

[0010] a driving mechanism and an optical element unit provided on the driving mechanism,

[0011] In which, the driving mechanism is suitable for driving the optical element unit to be inserted between the object plane and the lens unit, and the optical element unit is used to change the optical path between the object plane and the main plane of the lens unit so that the object plane is imaged at an image plane with a different physical distance from the main plane of the lens unit.

[0012] Preferably, the spatial refractive index and thickness of the optical element unit are determined according to the optimal imaging conjugate relationship of the lens assembly and the target distance, and the target distance is the physical distance between the image plane and the main plane of the lens unit when the optical element unit is located between the object plane and the lens unit.

[0013] Preferably, when the optical element unit is located between the object plane and the lens unit, the optimal imaging conjugate relationship of the lens assembly is: L2 = (d1-d3) × n + d3 × n1 L2' = d2' × n' f' / L2' + f / L2 = 1 f' / f = -n' / n

[0014] Among them, L2 is the optical path from the object plane to the principal plane of the lens unit, n1 is the refractive index of the optical element unit, d1 is the physical distance from the object plane to the principal plane of the lens unit, d3 is the thickness of the optical element unit, n is the spatial refractive index between the object plane and the lens unit, n' is the spatial refractive index between the lens unit and the image plane, L2' is the optical path between the lens unit and the image plane, d2' is the target distance, f is the object-side focal length of the lens unit, and f' is the image-side focal length of the lens unit.

[0015] Preferably, the driving mechanism flips or translates the optical element unit so that the optical element unit is inserted between the object plane and the lens unit.

[0016] Preferably, the driving mechanism includes a driving motor, a transmission rod connected to the driving motor, and a clamping structure connected to the transmission rod, wherein the clamping structure can fix the optical element unit and drive the optical element unit to move along the central axis of the transmission rod or drive the optical element unit to flip along with the transmission rod.

[0017] Preferably, the optical element unit includes a flat plate medium.

[0018] According to a second aspect of the present application, there is provided an optical adjustment assembly, which is applied to a lens assembly. The lens assembly includes an object plane, an image plane, a lens unit disposed between the object plane and the image plane, and the optical adjustment assembly. The optical adjustment assembly includes:

[0019] a driving mechanism and an optical element unit provided on the driving mechanism,

[0020] The driving mechanism is suitable for driving the optical element unit to be inserted between the lens unit and the image plane, and the optical element unit is used to change the focal length of the lens unit so that the object plane is imaged at an image plane with a different physical distance from the main plane of the lens unit.

[0021] Preferably, when the optical element unit is located between the lens unit and the image plane, the optical element unit and the lens unit jointly provide a quasi-principal plane of the lens unit.

[0022] Preferably, the focusing parameters of the optical element unit are determined according to the optimal imaging conjugate relationship of the lens assembly and the target distance, and the target distance is the physical distance between the image plane and the quasi-principal plane of the lens unit when the optical element unit is located between the lens unit and the image plane.

[0023] Preferably, when the optical element unit is placed between the lens unit and the image plane, the optimal imaging conjugate relationship of the lens assembly is: 1 / L4'-1 / L4=1 / f4'

[0024] Among them, L4 is the optical path from the object plane to the quasi-principal plane, L4' is the optical path from the quasi-principal plane to the image plane, and f4' is the image-side focal length of the lens unit when the optical element unit is placed between the lens unit and the image plane.

[0025] Preferably, the driving mechanism flips or translates the optical element unit so that the optical element unit is inserted between the lens unit and the image plane.

[0026] Preferably, the driving mechanism includes a driving mechanism fixing bracket, a driving motor connected to the driving mechanism fixing bracket, a transmission rod connected to the driving motor, and a clamping structure connected to the transmission rod. The optical element unit is connected to the clamping structure, and the driving motor can drive the transmission rod to rotate, thereby driving the clamping structure and the optical element unit to move along the central axis of the transmission rod.

[0027] Preferably, a guide groove is further provided on the driving mechanism fixing bracket, the extension direction of the guide groove is parallel to the central axis of the transmission rod, and the clamping structure can move along the guide groove.

[0028] Preferably, the driving mechanism includes a driving mechanism fixing bracket, a driving motor connected to the driving mechanism fixing bracket, a gear set connected to the driving motor, a transmission rod connected to the gear set, and a clamping structure connected to the transmission rod. The optical element unit is connected to the clamping structure, and the driving motor can drive the gear set to rotate, thereby driving the transmission rod to flip.

[0029] Preferably, the optical element unit includes a focusing lens.

[0030] Preferably, the light incident surface and the light emitting surface of the focusing lens are both curved surfaces.

[0031] A third aspect of the present application provides a lens assembly, comprising:

[0032] physical surface;

[0033] Image plane;

[0034] a lens unit disposed between the object plane and the image plane;

[0035] An optical adjustment component as described in any one of the technical solutions of the first aspect; and / or

[0036] An optical adjustment component as described in any of the technical solutions of the second aspect.

[0037] Preferably, a lens fixing bracket is further included, and the lens unit is fixedly connected to the lens fixing bracket.

[0038] Preferably, the object surface is a display chip capable of actively emitting light, a display chip capable of passively emitting light, or a photosensitive chip capable of collecting light.

[0039] A fourth aspect of the present application further provides a vehicle-mounted projection lamp, comprising a lens assembly according to any one of the technical solutions of the third aspect.

[0040] The optical adjustment component of the present application has the following advantages:

[0041] First, the optical element unit is inserted between the object plane and the lens unit through a driving mechanism to change the optical path between the object plane and the principal plane of the lens unit, so that when the optical element unit is not inserted between the object plane and the lens unit and when it is inserted between the object plane and the lens unit, the object plane can be imaged at an image plane with a different physical distance from the principal plane of the lens unit.

[0042] Second, when the optical element unit is a focusing lens, the optical element unit is inserted between the image plane and the lens unit through a driving mechanism, and the optical element unit can change the focal length of the lens unit so that when the optical element unit is not inserted between the image plane and the lens unit and when it is inserted between the image plane and the lens unit, the object plane can be imaged at an image plane with different physical distances from the main plane of the lens unit.

[0043] The lens assembly and vehicle-mounted projection lamp of the present application include the above-mentioned optical adjustment assembly, and thus also have the advantages of the above-mentioned optical adjustment assembly.

[0044] Other advantages of the present application and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG1 is a schematic structural diagram of a first embodiment of a lens assembly according to the present invention, showing that the focusing lens is not placed between the lens and the image plane;

[0046] FIG2 is a second structural schematic diagram of the first specific embodiment of the lens assembly of the present application, showing that the focusing lens is placed between the lens and the image plane;

[0047] FIG3 is a schematic diagram of the structure of a second embodiment of the lens assembly of the present application, showing that the focusing lens is not placed between the lens and the image plane;

[0048] FIG4 is a second structural schematic diagram of the second specific embodiment of the lens assembly of the present application, showing that the focusing lens is placed between the lens and the image plane;

[0049] FIG5 is a schematic structural diagram of a specific embodiment of the focusing lens of the present application;

[0050] FIG6 is a schematic diagram of the structure of the third embodiment of the lens assembly of the present application, showing that the focusing lens is not placed between the object plane and the lens;

[0051] FIG7 is a second structural schematic diagram of the third specific embodiment of the lens assembly of the present application, showing that the focusing lens is placed between the object plane and the lens;

[0052] FIG8 is a schematic structural diagram of another specific embodiment of the focusing lens of the present application;

[0053] FIG9 is a structural schematic diagram of a specific embodiment of the lens mounting structure of the present application;

[0054] FIG10 is a second structural schematic diagram of a specific embodiment of the lens mounting structure of the present application.

[0055] DESCRIPTION OF REFERENCE NUMERALS 1 Object plane 2 Optical element unit 3 Transmission rod 4 Driving mechanism fixing bracket 5 Driving motor 6 Gear set 601 First gear 602 Second gear 7 Clamping structure 8 Lens unit 9 Lens fixing bracket 10 Image plane DETAILED DESCRIPTION

[0056] The specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to illustrate and explain the present application, and the scope of protection of the present application is not limited to the specific implementation methods described below.

[0057] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "installed" and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0058] In the description of this application, it is necessary to explain that certain directional terms, such as "up," "down," "left," and "right," used in the following description to clearly illustrate the technical solutions of this application, are based on the normal operating orientation of a vehicle-mounted projector lamp. "Front" refers to the direction in which light is emitted, "rear" refers to the direction opposite to "front," and "up" and "down" refer to the vertical orientation of the vehicle-mounted projector lamp after it is installed on a vehicle. These terms are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the device or component referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0059] As shown in Figures 6 and 7, a first aspect of the present application provides an optical adjustment assembly for use in a lens assembly, the lens assembly comprising an object plane 1, an image plane 10, a lens unit 8 disposed between the object plane 1 and the image plane 10, and an optical adjustment assembly. The optical adjustment assembly comprises a drive mechanism and an optical element unit 2 disposed on the drive mechanism.

[0060] The driving mechanism is suitable for driving the optical element unit 2 to be inserted between the object plane 1 and the lens unit 8. The optical element unit 2 is used to change the optical path between the object plane 1 and the main plane of the lens unit 8 so that the object plane 1 is imaged on the image plane 10 which has a different physical distance from the main plane of the lens unit 8.

[0061] In a specific embodiment of the present application, a lens unit 8 is provided between the object plane 1 and the image plane 10, and the relative positions of the object plane 1 and the lens unit 8 are fixed, that is, the physical distance between the object plane 1 and the lens unit 8 remains unchanged. In order to enable the lens assembly to clearly image at image planes at different distances with a low cost and a simple structure while keeping the physical distance between the object plane 1 and the lens unit 8 unchanged, the present application provides a driving mechanism, on which an optical element unit 2 is provided. Under the action of the driving mechanism, the optical element unit 2 switches between being placed between the object plane 1 and the lens unit 8 and not being placed between the two.

[0062] In some specific embodiments, the optical element unit 2 includes a flat plate medium, as shown in Figure 8. The present application is not limited thereto, and the optical element unit 2 may also include multiple optical components.

[0063] In some specific embodiments, the lens unit 8 may include one or more imaging lenses. Specifically, the lens unit 8 may include a pair of principal planes, wherein the physical distance and optical path between the object plane and the principal planes are both determined by the principal plane of the lens unit 8 close to the object plane; and the physical distance and optical path between the image plane and the principal planes are both determined by the principal plane of the lens unit 8 close to the image plane.

[0064] In some specific embodiments, the spatial refractive index and thickness of the optical element unit 2 can be determined based on the optimal imaging conjugate relationship of the lens assembly and the target distance. The target distance is the physical distance between the image plane 10 and the principal plane of the lens unit 8 when the optical element unit 2 is positioned between the object plane 1 and the lens unit 8. In other words, the corresponding optical element unit can be selected based on the desired imaging location. Furthermore, in some specific embodiments, the optical element unit 2 can be detachably mounted to the drive mechanism, thereby enabling clear imaging at different distances from the image plane 10 by replacing the optical element unit 2.

[0065] As shown in FIG6 , when the optical element unit 2 is not disposed between the object plane 1 and the lens unit 8 , the optimal imaging conjugate relationship of the lens assembly is: L1=d1×n L1'=d1'×n' f' / L1'+f / L1=1 f' / f=-n' / n

[0066] Wherein, L1 is the optical path from the object plane 1 to the principal plane of the lens unit 8 in FIG6 , d1 is the physical distance from the object plane 1 to the principal plane of the lens unit 8, n is the spatial refractive index between the object plane 1 and the lens unit 8, n' is the spatial refractive index between the lens unit 8 and the image plane 10, L1' is the optical path between the lens unit 8 and the image plane 10 (the image plane 10 with a clear image when the optical element unit 2 is not inserted), d1' is the physical distance between the lens unit 8 and the image plane 10 (the image plane 10 with a clear image when the optical element unit 2 is not inserted), f is the object-side focal length of the lens unit 8, and f' is the image-side focal length of the lens unit 8.

[0067] Furthermore, the above-mentioned optimal imaging conjugate relationship is an approximate calculation of optical design calculation, and can be optimized and adjusted in actual use according to the complexity of the optical lens.

[0068] When the optical element unit 2 is moved between the object plane 1 and the lens unit 8 by the driving mechanism, due to the action of the optical element unit 2, the optical path between the object plane 1 and the principal plane of the lens unit 8 is changed while the physical distance between the object plane 1 and the principal plane of the lens unit 8 remains unchanged, thereby changing the distance between the image plane 10 and the principal plane of the lens unit 8 (that is, changing it to the target distance).

[0069] Specifically, as shown in FIG7 , when the optical element unit 2 is located between the object plane 1 and the lens unit 8, the optimal imaging conjugate relationship of the lens assembly is: L2 = (d1-d3)×n+d3×n1 L2' = d2'×n' (f') / L2'+f / L2 = 1 (f') / f = -n' / n

[0070] Wherein, L2 is the optical path from the object plane 1 to the principal plane of the lens unit 8, n1 is the refractive index of the optical element unit 2, d1 is the physical distance from the object plane 1 to the principal plane of the lens unit 8, d3 is the thickness of the optical element unit 2, n is the spatial refractive index between the object plane 1 and the lens unit 8, n' is the spatial refractive index between the lens unit 8 and the image plane 10, L2' is the optical path between the lens unit 8 and the image plane 10, d2' is the target distance, f is the object-side focal length of the lens unit 8, and f' is the image-side focal length of the lens unit 8.

[0071] In one specific implementation, the object and image spaces are both in air, n = n^' = 1, the lens focal length f = f^' = 42 mm, and the physical distances from the object plane 1 to the lens principal plane are L1 = d1 = 42.445 mm, L1' = 4 m, and L2' = 8 m. Therefore, an optical element unit 2 having a refractive index n1 = 1.52 and a thickness d3 = 0.45 mm can be used to achieve clear imaging at the target distance. Optical element units 2 having different refractive indices and thicknesses can be used depending on the target distance.

[0072] In some specific embodiments, the driving mechanism can flip or translate the optical element unit 2 so that the optical element unit 2 is inserted between the object plane 1 and the lens unit 8. The driving mechanism drives the optical element unit 2 to be inserted between the object plane 1 and the lens unit 8 or to be removed from between the object plane 1 and the lens unit 8, thereby requiring lower structural precision of the driving mechanism.

[0073] In some specific implementations of the driving mechanism, as shown in FIG10 , the driving mechanism includes a driving motor 5, a transmission rod 3 connected to the driving motor 5, and a clamping structure 7 connected to the transmission rod 3. The clamping structure 7 is capable of fixing the optical element unit 2 and driving the optical element unit 2 to flip along with the transmission rod 3. Thus, in this embodiment, the driving mechanism flips along with the rotation of the transmission rod 3, so that the optical element unit 2 can be switched between the object plane 1 and the lens unit 8, or not between the object plane 1 and the lens unit 8. When the optical element unit 2 is not between the object plane 1 and the lens unit 8, the optical element unit 2 can still be close to the space between the object plane 1 and the lens unit 8, thereby simplifying the driving structure and achieving miniaturization of the lens assembly.

[0074] In some variations, as shown in Figures 6, 7, 9, and 10, the drive mechanism may further include a drive mechanism fixing bracket 4, to which the drive motor 5 may be connected. The drive mechanism fixing bracket 4 may be connected to the lens fixing bracket 9 or integrally formed with the lens fixing bracket 9, thereby connecting the drive mechanism and the lens unit together. This application is not limited to this, and the drive mechanism fixing bracket 4 may also be separately fixed to the housing of the vehicle-mounted projector lamp.

[0075] In some variations, as shown in Figures 6, 7, and 9, the driving mechanism may further include a gear set 6 connected to the driving motor 5, and the transmission rod 3 is connected to the gear set 6. Thus, the transmission of the driving motor 5 and the transmission rod 3 can be achieved through the gear set 6, and the flexible arrangement of the driving mechanism is facilitated while the driving mechanism is translated along the central axis of the transmission rod 3.

[0076] A second aspect of the present application provides an optical adjustment component, which is applied to a lens assembly. The lens assembly includes an object plane 1, an image plane 10, a lens unit 8 arranged between the object plane 1 and the image plane 10, and an optical adjustment component. The optical adjustment component includes: a driving mechanism and an optical element unit 2 arranged on the driving structure.

[0077] The driving mechanism is suitable for driving the optical element unit 2 to be inserted between the lens unit 8 and the image plane 10. The optical element unit 2 is used to change the focal length of the lens unit 8 so that the object plane 1 is imaged on the image plane 10 with a different physical distance from the main plane of the lens unit 8.

[0078] In a specific embodiment of the present application, a lens unit 8 is provided between the object plane 1 and the image plane 10, and the relative positions of the object plane 1 and the lens unit 8 are fixed, that is, the physical distance between the object plane 1 and the lens unit 8 remains unchanged. In order to enable the lens assembly to clearly image at image planes of different distances with a low cost and a simple structure while keeping the physical distance between the object plane 1 and the lens unit 8 unchanged, the present application provides a driving mechanism, on which an optical element unit 2 is provided. Under the action of the driving mechanism, the optical element unit 2 switches between being placed between the image plane 10 and the lens unit 8 and not being placed between the two.

[0079] In some specific embodiments, the optical element unit 2 includes a focusing lens, as shown in Figure 5. The light incident surface and the light emitting surface of the focusing lens can both be curved surfaces.

[0080] In some specific embodiments, the lens unit 8 may include one or more imaging lenses. Specifically, the lens unit 8 may include a pair of principal planes, wherein the physical distance and optical path between the object plane and the principal planes are both determined by the principal plane of the lens unit 8 close to the object plane; and the physical distance and optical path between the image plane and the principal planes are both determined by the principal plane of the lens unit 8 close to the image plane.

[0081] In some specific embodiments, the focusing parameters of the optical element unit 2 are determined based on the optimal imaging conjugate relationship of the lens assembly and the target distance, where the target distance is the physical distance between the image plane 10 and the quasi-principal plane of the lens unit 8 when the optical element unit 2 is positioned between the lens unit 8 and the image plane 10. In this embodiment, when the optical element unit 2 is positioned between the lens unit 8 and the image plane 10, the optical element unit 2 and the lens unit 8 jointly provide the quasi-principal plane of the lens unit 8, meaning that the principal plane of the lens unit 8 is displaced.

[0082] As shown in FIG1 and FIG3, when the optical element unit 2 is not disposed between the lens unit 8 and the image plane 10, the optimal imaging conjugate relationship of the lens assembly is: 1 / L3'-1 / L3=1 / f3'

[0083] Wherein, L3 is the distance from the object plane 1 to the principal plane of the lens unit 8, L3' is the distance from the principal plane of the lens unit 8 to the image plane 10, and f3' is the image-side focal length of the lens unit when the optical element unit 2 is not placed between the lens unit 8 and the image plane 10.

[0084] As shown in FIG2 and FIG4, when the optical element unit 2 is placed between the lens unit 8 and the image plane 10, the optimal imaging conjugate relationship of the lens assembly is: 1 / L4'-1 / L4=1 / f4'

[0085] Wherein, L4 is the optical path from the object plane 1 to the quasi-principal plane, L4′ is the optical path from the quasi-principal plane to the image plane 10, and f4′ is the image-side focal length of the lens unit 8 when the optical element unit 2 is placed between the lens unit 8 and the image plane 10.

[0086] In a specific embodiment, when optical element unit 2 is not inserted, the image-side focal length of lens unit 8 is [f3]^' = 42.5 mm, and the optical path from object plane 1 to the principal plane of the lens unit is L3 = d = 43.2 mm, where d is the physical distance from object plane 1 to the principal plane of the lens unit, L3' = 8 m, and L4' = 4 m. Therefore, when optical element unit 2 is inserted, the image-side focal length of lens unit 8 is [f4]^(') = 42.96 mm. An optical element unit 2 having a focal power of Φ = 0.0000688, lens parameters of R1 = 59.021 mm, R2 = 57.563 mm, a lens thickness of d1 = 5 mm, and a material refractive index of 1.585 mm can be used. Optical element units 2 with different focusing parameters can be used depending on the target distance.

[0087] Furthermore, the above-mentioned optimal imaging conjugate relationship is an approximate calculation of optical design calculation, and can be optimized and adjusted in actual use according to the complexity of the optical lens.

[0088] In some specific embodiments, the driving mechanism can flip or translate the optical element unit 2 so that the optical element unit 2 is inserted between the lens unit 8 and the image plane 10. The driving mechanism drives the optical element unit 2 to be inserted between the image plane 10 and the lens unit 8 or to be removed from between the image plane 10 and the lens unit 8, thereby requiring a lower structural precision of the driving mechanism.

[0089] In a preferred embodiment of the present application, the drive mechanism includes a drive motor 5, a transmission rod 3 connected to the drive motor 5, and a clamping structure 7 connected to the transmission rod 3. The optical element unit 2 is connected to the clamping structure 7. The drive motor 5 is capable of driving the transmission rod 3 to rotate, thereby driving the clamping structure 7 and the optical element unit 2 to move along the central axis of the transmission rod 3. As shown in Figures 1 and 2, when the drive motor 5 drives the transmission rod 3 to rotate, the clamping structure 7 is capable of reciprocating along the central axis of the transmission rod 3, thereby enabling the optical element unit 2 to reciprocate between the lens unit 8 and the image plane 10. That is, the optical element unit 2 can be inserted between the lens unit 8 and the image plane 10 and can also be removed.

[0090] In some variations, the drive mechanism may further include a drive mechanism fixing bracket 4, to which the drive motor 5 may be connected. The drive mechanism fixing bracket 4 may be connected to the lens fixing bracket 9 or integrally formed with the lens fixing bracket 9, thereby connecting the drive mechanism and the lens unit. This application is not limited to this, and the drive mechanism fixing bracket 4 may also be separately fixed to the housing of the vehicle-mounted projector lamp. In this embodiment, the drive mechanism fixing bracket 4 may also be provided with a guide groove extending parallel to the central axis of the transmission rod 3, and the clamping structure 7 can move along the guide groove.

[0091] In a preferred embodiment of the present application, the driving mechanism includes a driving motor 5, a transmission rod 3 connected to the driving motor 5, and a clamping structure 7 connected to the transmission rod 3. The optical element unit 2 is connected to the clamping structure 7, and the driving motor 5 can drive the transmission rod 3 to flip. In some variations, the driving motor 5 can also be connected to the transmission rod 3 through a gear set 6. As shown in Figures 3 and 4, during use, the driving motor 5 drives the transmission rod 3 to flip (or drives the transmission rod 3 to flip by rotating the driving gear set 6), and finally drives the optical element unit 2 to flip, so that the optical element unit 2 can switch between the two states of being between the lens unit 8 and the image plane 10 or not being between the lens unit 8 and the image plane 10.

[0092] The present application also provides a lens assembly, which includes: an object plane 1; an image plane 10; a lens unit 8 arranged between the object plane 1 and the image plane 10; an optical adjustment component of any one of the technical solutions of the first aspect; and / or an optical adjustment component of any one of the technical solutions of the second aspect.

[0093] As a preferred embodiment, in the lens assembly of the present application, the optical adjustment component in the first technical solution can be set between the object plane 1 and the lens unit 8, and the optical adjustment component in the second technical solution can be set between the lens unit 8 and the image plane 10. Alternatively, the optical adjustment component in the first technical solution can be set only between the object plane 1 and the lens unit 8, or the optical adjustment component in the second technical solution can be set only between the lens unit 8 and the image plane 10, depending on actual usage requirements.

[0094] In a preferred embodiment of the present application, a lens fixing bracket 9 is further included, and the lens unit 8 is fixedly connected to the lens fixing bracket 9.

[0095] In the present application, the central area of ​​the lens fixing bracket 9 is formed as a circular through hole, and two claws are integrally formed on its outer peripheral surface for clamping to other structures, such as the clamping drive mechanism fixing bracket 4, so as to fix the lens unit 8.

[0096] Preferably, as shown in FIG. 9 , the gear set 6 comprises a first gear 601 and a second gear 602 meshing with each other, and the first gear 601 and the second gear 602 are arranged on the driving mechanism fixing bracket 4 .

[0097] In a preferred embodiment of the present application, the object surface 1 is a display chip that can actively emit light, a display chip that can passively emit light, or a photosensitive chip that can receive light.

[0098] A fourth aspect of the present application further provides a vehicle-mounted projection lamp, comprising the lens assembly according to the foregoing.

[0099] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the scope of protection of the present application.

[0100] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner unless there is any contradiction. In order to avoid unnecessary repetition, this application will not further describe various possible combinations.

[0101] In addition, the various implementation methods of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed in the present application.

Claims

1. An optical adjustment component, applied to a lens assembly, characterized in that: The lens assembly comprises an object plane (1), an image plane (10), a lens unit (8) arranged between the object plane (1) and the image plane (10), and the optical adjustment assembly, wherein the optical adjustment assembly comprises: A driving mechanism and an optical element unit (2) arranged on the driving mechanism, The driving mechanism is suitable for driving the optical element unit (2) to be inserted between the object plane (1) and the lens unit (8), and the optical element unit (2) is used to change the optical path between the object plane (1) and the principal plane of the lens unit (8), so that the object plane (1) is imaged on an image plane (10) having a different physical distance from the principal plane of the lens unit (8).

2. The optical adjustment assembly according to claim 1, wherein: The spatial refractive index and thickness of the optical element unit (2) are determined based on the optimal imaging conjugate relationship of the lens assembly and the target distance, wherein the target distance is the physical distance between the image plane (10) and the main plane of the lens unit (8) when the optical element unit (2) is located between the object plane (1) and the lens unit (8).

3. The optical adjustment assembly according to claim 2, wherein: When the optical element unit (2) is located between the object plane (1) and the lens unit (8), the optimal imaging conjugate relationship of the lens assembly is: L2 = (d1-d3) × n + d3 × n1 L2' = d2' × n' f' / L2' + f / L2 = 1 f' / f = -n' / n Wherein, L2 is the optical distance from the object plane (1) to the principal plane of the lens unit (8), n1 is the refractive index of the optical element unit (2), d1 is the physical distance from the object plane (1) to the principal plane of the lens unit (8), d3 is the thickness of the optical element unit (2), n is the spatial refractive index between the object plane (1) and the lens unit (8), n' is the spatial refractive index between the lens unit (8) and the image plane (10), L2' is the optical distance between the lens unit (8) and the image plane (10), d2' is the target distance, f is the object side focal length of the lens unit (8), and f' is the image side focal length of the lens unit (8).

4. The optical adjustment assembly according to any one of claims 1 to 3, characterized in that: The driving mechanism flips or translates the optical element unit (2) so that the optical element unit (2) is inserted between the object plane (1) and the lens unit (8).

5. The optical adjustment assembly according to claim 4, wherein: The driving mechanism comprises a driving motor (5), a transmission rod (3) connected to the driving motor (5), and a clamping structure (7) connected to the transmission rod (3); the clamping structure (7) is capable of fixing the optical element unit (2) and driving the optical element unit (2) to move along the central axis of the transmission rod (3) or driving the optical element unit (2) to flip along with the transmission rod (3).

6. The optical adjustment assembly according to any one of claims 1 to 3, characterized in that: The optical element unit (2) comprises a flat plate medium.

7. An optical adjustment component, applied to a lens assembly, characterized in that: The lens assembly comprises an object plane (1), an image plane (10), a lens unit (8) arranged between the object plane (1) and the image plane (10), and the optical adjustment assembly, wherein the optical adjustment assembly comprises: A driving mechanism and an optical element unit (2) arranged on the driving mechanism, The driving mechanism is suitable for driving the optical element unit (2) to be inserted between the lens unit (8) and the image plane (10), and the optical element unit (2) is used to change the focal length of the lens unit (8) so that the object plane (1) is imaged on the image plane (10) having a different physical distance from the main plane of the lens unit (8).

8. The optical adjustment assembly according to claim 7, wherein: When the optical element unit (2) is located between the lens unit (8) and the image plane (10), the optical element unit (2) and the lens unit (8) jointly provide a quasi-principal plane of the lens unit (8).

9. The optical adjustment assembly according to claim 8, wherein: The focusing parameters of the optical element unit (2) are determined based on the optimal imaging conjugate relationship of the lens assembly and the target distance, wherein the target distance is the physical distance between the image plane (10) and the quasi-principal plane of the lens unit (8) when the optical element unit (2) is located between the lens unit (8) and the image plane (10).

10. The optical adjustment assembly according to claim 8, wherein: When the optical element unit (2) is placed between the lens unit (8) and the image plane (10), the optimal imaging conjugate relationship of the lens assembly is: 1 / L4'-1 / L4=1 / f4' Wherein, L4 is the optical path from the object plane (1) to the quasi-principal plane, L4' is the optical path from the quasi-principal plane to the image plane (10), and f4' is the image-side focal length of the lens unit (8) when the optical element unit (2) is placed between the lens unit (8) and the image plane (10).

11. The optical adjustment assembly according to any one of claims 7 to 10, characterized in that: The driving mechanism flips or translates the optical element unit (2) so that the optical element unit (2) is inserted between the lens unit (8) and the image plane (10).

12. The optical adjustment assembly according to claim 11, wherein: The driving mechanism comprises a driving motor (5), a transmission rod (3) connected to the driving motor (5), and a clamping structure (7) connected to the transmission rod (3); the optical element unit (2) is connected to the clamping structure (7); the driving motor (5) is capable of driving the transmission rod (3) to rotate, thereby driving the clamping structure (7) and the optical element unit (2) to move along the central axis of the transmission rod (3).

13. The optical adjustment assembly according to claim 12, wherein: The driving mechanism further comprises a driving mechanism fixing bracket (4), the driving motor (5) is connected to the driving mechanism fixing bracket (4), and a guide groove is further provided on the driving mechanism fixing bracket (4), wherein the extension direction of the guide groove is parallel to the central axis of the transmission rod (3), and the clamping structure (7) is capable of moving along the guide groove.

14. The optical adjustment assembly according to claim 11, wherein: The driving mechanism comprises a driving motor (5), a transmission rod (3) connected to the driving motor (5), and a clamping structure (7) connected to the transmission rod (3); the optical element unit (2) is connected to the clamping structure (7); and the driving motor (5) is capable of driving the transmission rod (3) to flip.

15. The optical adjustment assembly according to any one of claims 7 to 10, characterized in that: The optical element unit (2) comprises a focusing lens.

16. The optical adjustment assembly according to claim 15, wherein: The light incident surface and the light emitting surface of the focusing lens are both curved surfaces.

17. A lens assembly, characterized in that: include: Object surface (1); Image plane (10); a lens unit (8) disposed between the object plane (1) and the image plane (10); An optical adjustment assembly according to any one of claims 1 to 6; and / or An optical adjustment assembly as claimed in any one of claims 7 to 16.

18. The lens assembly according to claim 17, wherein: It also includes a lens fixing bracket (9), and the lens unit (8) is fixedly connected to the lens fixing bracket (9).

19. The lens assembly according to claim 17, wherein: The object surface (1) is a display chip capable of actively emitting light, a display chip capable of passively emitting light, or a photosensitive chip capable of receiving light.

20. A vehicle-mounted projection lamp, characterized in that: Comprising a lens assembly according to any one of claims 17 to 19.

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