Lens transmission assembly, projection display device and vehicle

Abstract

The invention discloses a lens transmission assembly, a projection display device and a vehicle. The lens transmission assembly comprises a shell, a worm seat, a worm, a lens, a worm elastic piece and an abutting piece. The worm is arranged on the worm seat. The lens is arranged on the shell. The lens comprises a worm gear structure which is meshed with the worm. The worm elastic piece is arranged on the worm base and abuts against the worm. The abutting piece is arranged on the shell, and the abutting piece is constructed to abut against the worm elastic piece. And when the worm gear structure and the worm are meshed, a displacement difference is generated between the worm gear structure and the worm. The worm elastic piece can apply elastic force to the worm to compensate the displacement difference generated in the transmission process. In addition, by adjusting the abutting and pushing piece, the abutting and pushing piece actively applies acting force to the worm elastic piece, at the moment, the worm elastic piece can actively apply elastic force to the worm, the displacement difference in the transmission process is compensated, the abutting and pushing piece abuts and pushes the worm elastic piece, the modal rigidity of the worm elastic piece can be increased, and more displacement compensation can be provided for the worm. And the stability of image information is improved.

Description

Technical Field

[0001] This application relates to the field of projection display technology, and in particular to a lens transmission assembly, a projection display device, and a vehicle. Background Technology

[0002] With the continuous advancement of modern technology, projection display technology is being applied more and more widely, especially in the field of vehicle projection. Currently, due to the complex road conditions, the transmission of vehicle projection display lenses requires a certain amount of displacement compensation, which is usually achieved using worm gears and springs. However, this compensation method is usually passive, and image information still flickers and is not stable enough when the road environment is complex. Summary of the Invention

[0003] This application aims to provide a lens transmission assembly, a projection display device, and a vehicle, with the goal of improving the stability of the projected image.

[0004] In a first aspect, this application proposes a lens transmission assembly, including a housing and a worm gear seat. The worm gear seat is disposed in the housing. The lens transmission assembly further includes a worm, a lens, a worm gear spring, and a pushing member. The worm is rotatably disposed in the worm gear seat. The lens is rotatably disposed in the housing. The lens includes a worm wheel structure that meshes with the worm. The worm gear spring is disposed in the worm gear seat and abuts against the worm. The pushing member is rotatably disposed in the housing, with one end of the pushing member facing the spring, and the pushing member is configured to push against the worm gear spring.

[0005] In the above scheme, the lens is rotatably mounted on the housing, and the lens's reflection angle is adjusted through the meshing transmission between the worm gear structure and the worm. During transmission, the interaction force between the worm gear structure and the worm causes a displacement difference due to rotation. At this time, the worm spring applies a spring force to the worm, causing it to displace and compensate for the displacement difference during transmission, thereby improving the stability of the lens transmission. In addition, a pusher is provided to push against the worm spring. By adjusting the pusher, a force can be actively applied to the worm spring. In this way, the worm spring can actively apply a spring force to the worm, effectively compensating for the displacement difference during transmission. Through the cooperation of the pusher and the worm spring, displacement compensation can be actively performed on the meshing transmission between the worm and the lens, reducing the time required for the worm spring to provide displacement compensation and improving compensation efficiency. Furthermore, the pusher pushing against the worm spring increases the modal stiffness of the worm spring, which can provide more displacement compensation for the worm. This not only helps reduce image information shaking caused by lens instability under complex road conditions, but also helps improve the stability of image information.

[0006] In some embodiments, the lens transmission assembly further includes a second worm and a second worm wheel. The second worm wheel is sleeved on the pushing member, and the second worm meshes with the second worm wheel. The second worm wheel, sleeved on the pushing member, drives the pushing member to move through meshing with the second worm, causing the pushing member to push against the worm spring. The worm wheel and worm gear transmission method results in a smoother and more continuous transmission process for the pushing member, reducing vibration during transmission and making the pushing member more stable when pushing against the worm spring, thus improving the stability of the worm spring in providing compensation.

[0007] In some embodiments, the lens transmission assembly further includes a push motor connected to the push member, which drives the push member to move. Using a push motor as the power device to drive the push member allows for better control of the push member's movement and improves work efficiency.

[0008] In some embodiments, the housing has a first mounting groove, and the lens transmission assembly further includes a protective shell disposed in the first mounting groove. A pusher is disposed within the protective shell, and the protective shell has a third through hole for the pusher to extend and abut against the worm gear spring. The lens transmission assembly also includes a limiting member passing through the second worm gear. The protective shell includes a protective cylinder fitted over the pusher. One end of the limiting member abuts against the protective cylinder, and the other end abuts against the protective shell. The protective shell and the pusher disposed within it provide protection for the pusher. The third through hole in the protective shell allows the pusher to pass through and abut against the worm gear spring, providing positioning and guidance for the pusher, thus improving the efficiency of the pusher against the worm gear spring. Furthermore, the limiting member on the second worm gear restricts its displacement, reducing displacement errors in the pusher caused by the second worm gear's displacement. The protective cylinder fitted over the pusher provides better protection for the pusher.

[0009] In some embodiments, the lens transmission assembly further includes a motor, and the worm gear spring includes a first spring, a second spring, and a third spring. The first spring is connected to the second spring, and the second spring is connected to the third spring. The first spring has a first through hole, and the second spring has a second through hole. The motor passes through the first and second through holes and is connected to the worm. Along the axial direction of the worm, the first spring and the second spring are arranged sequentially, with the first spring abutting against the worm. Along the axial direction of the worm, the third spring extends in a direction away from the second spring, and at least partially forms an angle with the axial direction of the worm. The third spring is used to abut against a pushing member. The first spring and the second spring are arranged sequentially along the axial direction of the worm, with the first spring abutting against the worm. The first spring and the second spring can deform in the axial direction of the worm and provide elastic force to the worm, which is beneficial to improving the compensation efficiency of the worm gear spring in the axial direction of the worm. The motor is connected to the worm gear, and the motor transmission improves the worm gear's rotation efficiency. A first through hole is formed in the first spring plate, and a second through hole is formed in the second spring plate. The motor passes through both through holes, improving the compactness of the motor-worm gear structure, reducing the transmission path, improving transmission efficiency, and saving internal space. The third spring plate allows the pushing member to apply force to the worm gear spring plate. When subjected to force, the third spring plate deforms, transmitting the elastic force sequentially through the first and second spring plates to the worm gear. This design effectively compensates for the worm gear's displacement difference along the direction perpendicular to its axial direction during transmission, thereby improving the compensation efficiency of the worm gear spring plate.

[0010] In some embodiments, the housing has a first connecting groove and a second connecting groove. Along a first direction, the worm gear seat includes a first connecting arm and a second connecting arm disposed opposite to each other. The first connecting arm extends at least partially into the first connecting groove, and the second connecting arm extends at least partially into the second connecting groove. By providing the first and second connecting arms in the worm gear seat and the first and second connecting grooves in the housing, and by correspondingly placing the two connecting arms within the two connecting grooves, when the worm gear meshes with the lens to drive the worm gear seat to rotate, the connecting grooves constrain the connecting arms, thereby making the connection between the worm gear seat and the housing more stable and improving the stability of the image.

[0011] In some embodiments, the lens includes a third connecting arm and a fourth connecting arm, and the housing includes a third connecting groove and a fourth connecting groove. The third connecting arm includes a first ball joint, and the fourth connecting arm includes a second ball joint, the first ball joint being disposed in the third connecting groove, and the second ball joint being disposed in the fourth connecting groove.

[0012] A third ball joint and a fourth ball joint are respectively set on the third and fourth connecting arms of the lens. These ball joints can reduce interference with the housing when the lens rotates. Furthermore, the contact surface between the ball joint and the housing is curved, which makes the lens rotate more smoothly. This not only improves the convenience of lens adjustment but also helps to improve the smoothness of the image when the lens is adjusted.

[0013] In some embodiments, along the second direction, the first connecting arm includes a first arc surface and a second arc surface disposed opposite to each other, and the second connecting arm includes a third arc surface and a fourth arc surface disposed opposite to each other. The first connecting groove includes a fifth arc surface, and the second connecting groove includes a sixth arc surface. The first and second arc surfaces contact the fifth arc surface, and the third and fourth arc surfaces contact the sixth arc surface. The second direction is perpendicular to the first direction. Providing arc surfaces on the first and second connecting arms can limit the non-working displacement of the worm gear seat during lens transmission, reducing lens wobbling during transmission. Furthermore, the arc surfaces in the first and second connecting grooves, which mate with the arc surfaces on the first and second connecting arms, make the worm gear seat rotate more smoothly, thus improving the stability of lens adjustment.

[0014] Secondly, this application provides a projection display device, including a lens transmission assembly as described in any embodiment of the first aspect.

[0015] Thirdly, this application proposes a vehicle comprising a projection display device, a sensor, and a first controller as described in any embodiment of the second aspect. The projection display device includes a second controller. The first controller and the second controller are communicatively connected.

[0016] The sensor is used to detect road conditions and / or driving status, and outputs road condition and / or driving status signals to a first controller. The first controller is configured to output a first signal based on the road condition and / or driving status signals, and a second controller is configured to acquire the first signal and output a control signal based on the first signal. The control signal is used to control the working state and / or degree of pushing of the pushing member.

[0017] Additional aspects and advantages of the embodiments of this application will be described, shown, or illustrated in part by way of implementation of the embodiments of this application in the following description. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, and elements having the same reference numerals in the drawings are designated as similar elements.

[0019] Figure 1 This is a schematic diagram of the structure of a lens transmission assembly according to some embodiments of this application; Figure 2 This is a partial structural schematic diagram of a lens transmission assembly according to some embodiments of this application; Figure 3 This is a schematic diagram of the structure of the worm gear spring in some embodiments of this application; Figure 4 This is a partial structural schematic diagram of a lens transmission assembly according to some embodiments of this application; Figure 5 This is a schematic diagram of the housing structure of some embodiments of this application; Figure 6 This is a schematic diagram of the worm gear seat structure of some embodiments of this application; Figure 7 This is a schematic diagram of the worm gear seat structure of some embodiments of this application; Figure 8 This is a schematic diagram of the lens structure in some embodiments of this application; Figure 9 This is a schematic diagram of the lens structure in some embodiments of this application; Figure 10 This is a partial structural schematic diagram of a lens transmission assembly according to some embodiments of this application; Figure 11 This is a partial structural schematic diagram of a lens transmission assembly according to some embodiments of this application; Figure 12 This is a cross-sectional view of the protective shell of some embodiments of this application.

[0020] Explanation of reference numerals in the attached drawings: 1. Housing; 11. First connecting groove; 111. Fifth arc surface; 12. Second connecting groove; 121. Sixth arc surface; 13. Third connecting groove; 14. Fourth connecting groove; 15. First mounting groove; 2. Worm gear seat; 21. Second mounting slot; 22. First connecting arm; 221. First arc surface; 222. Second arc surface; 23. Second connecting arm; 231. Third arc surface; 232. Fourth arc surface; 3. Worm gear; 4. Lens; 41. Worm gear structure; 42. Third connecting arm; 421. First ball joint; 43. Fourth connecting arm; 431. Second ball joint; 5. Worm gear spring; 51. First spring; 511. First through hole; 52. Second spring; 521. Second through hole; 53. Third spring; 6. Pushing component; 71. Electric motor; 72. Push motor; 81. Second worm gear; 82. Second worm wheel; 83. Limiting component; 9. Protective shell; 91. Third through hole; 92. Protective sleeve; X, the first direction; Y, the second direction. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0022] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0023] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0024] The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0025] In a first aspect, this application provides a lens transmission assembly, including a housing 1 and a worm gear seat 2, the worm gear seat 2 being disposed in the housing 1, and the lens transmission assembly further including a worm 3, a lens 4, a worm gear spring 5, and a pusher 6.

[0026] The worm seat 2 mentioned above is used to support the worm 3.

[0027] As the aforementioned housing 1, housing 1 serves as the load-bearing component of the transmission assembly, and is required to support core components such as the worm gear seat 2 and the lens 4. During operation, it will be subjected to vibration or impact. The impact of vibration or impact can be reduced by adding reinforcing ribs to housing 1 or by thickening key stress-bearing parts.

[0028] For the aforementioned worm gear 3, which serves as the main transmission component for the transmission lens 4, a smaller tooth flank clearance can be used. For example, the tooth flank clearance can be set to 0.09mm-0.15mm. A smaller tooth flank clearance can reduce the shaking of the lens 4 during transmission and improve the stability of the image.

[0029] For the aforementioned lens 4, the lens 4 rotates through the meshing of the worm gear structure 41 and the worm 3, thereby adjusting the reflection angle of the lens 4. The material of the lens 4 needs to have a certain mechanical strength to reduce the possibility of cracking or detachment during the movement of the lens 4. Furthermore, the surface of the lens 4 can be protected by a coating treatment, and the coating layer can be an aluminum film, a silver film, or a dielectric film, etc. The substrate of the lens 4 can be optical glass or high-quality acrylic.

[0030] The aforementioned worm spring 5 is mounted on the worm seat 2 and provides elastic force to the worm 3 during the meshing transmission process between the worm 3 and the worm wheel structure 41. The worm spring 5 can be made of materials with high elasticity and high fatigue strength, such as stainless steel, spring steel, or beryllium bronze. This is beneficial for improving the elastic performance of the worm spring 5 in long-term vibration environments. Furthermore, the surface of the worm spring 5 can be plated with hard chrome, nitrided, or coated with an anti-friction coating to reduce the coefficient of friction, decrease wear and heat generation, and improve the long-term stability of the worm spring 5.

[0031] Please refer to Figure 1 and Figure 2 The worm 3 is rotatably mounted on the worm seat 2. The lens 4 is rotatably mounted on the housing 1. The lens 4 includes a worm gear structure 41, which meshes with the worm 3. It can be understood that when the worm gear structure 41 meshes with the worm 3, the rotation of the worm 3 drives the worm gear structure 41, which in turn drives the lens 4 to rotate. The number of teeth and the tooth pitch of the meshing between the worm 3 and the worm gear structure 41 can be set according to the adjustment requirements of the lens 4. For example, when the angle range of the lens 4 to be adjusted is large, more teeth and a larger tooth pitch can be used, while when the angle range of the lens 4 to be adjusted is small, fewer teeth and a smaller tooth pitch can be used. The worm spring 5 is mounted on the worm seat 2 and abuts against the worm 3. The worm spring 5 provides elastic force to the worm 3 to compensate for the displacement during meshing. The elastic deformation of the worm spring 5 can be set as needed. For example, when the angle adjustment range of the lens 4 is small, the displacement difference that the worm 3 needs to compensate for is small, so the elastic deformation of the worm spring 5 can be set smaller. Conversely, when the displacement that the worm 3 needs to compensate for is large, the elastic deformation of the worm spring 5 can be set larger. The pusher 6 is rotatably mounted on the housing 1, with one end of the pusher 6 facing the spring. The pusher 6 is configured to push against the worm spring 5. It is understood that the direction in which the pusher 6 pushes against the worm spring 5 can be any direction that allows the worm spring 5 to produce effective deformation. For example, the direction in which the pusher 6 pushes against the worm spring 5 can be perpendicular to the axial direction of the worm 3, or other directions set according to the structural design. It is understood that the pusher 6 can be a lead screw, a push block, or other structure capable of applying force.

[0032] In the above scheme, the lens 4 is rotatably mounted on the housing 1. Through the meshing transmission between the worm gear structure 41 and the worm 3 of the lens 4, the reflection angle of the lens 4 can be adjusted. During transmission, due to the influence of rotation, the interaction force between the worm gear structure 41 and the worm 3 will cause a displacement difference, resulting in unstable meshing. At this time, the worm spring 5 will apply a spring force to the worm 3, causing the worm 3 to displace, compensating for the displacement difference generated during transmission, making the transmission of the lens 4 more stable. A pusher 6 is provided, and the pusher 6 pushes against the worm spring 5. The pusher 6 can be adjusted so that it actively applies a force to the worm spring 5. At this time, the worm spring 5 can actively apply a spring force to the worm 3, thus compensating for the displacement difference during transmission. By setting the pusher 6 and the worm spring 5, displacement compensation can be actively performed on the meshing transmission between the worm 3 and the lens 4, reducing the time required for the worm spring 5 to provide displacement compensation to the worm 3 and improving the compensation efficiency. Furthermore, the pusher 6 pushes the worm spring 5, which increases the modal stiffness of the worm spring 5, allowing it to provide more displacement compensation for the worm 3. This makes the meshing between the worm 3 and the worm wheel structure 41 tighter, which helps to reduce the image information shaking caused by the instability of the lens 4 on complex road surfaces and improves the stability of the image information.

[0033] In some embodiments, please refer to Figure 10 The lens transmission assembly also includes a second worm 81 and a second worm wheel 82. The second worm wheel 82 is sleeved on the pusher 6, and the second worm 81 meshes with the second worm wheel 82. The second worm wheel 82, sleeved on the pusher 6, drives the pusher 6 to move through meshing with the second worm 81, causing the pusher 6 to push against the worm spring 5. The transmission method of the second worm wheel 82 and the second worm 81 makes the transmission process of the pusher 6 relatively smooth and continuous, which can reduce the vibration of the pusher 6 during the transmission process, making the pusher 6 more stable when pushing against the worm spring 5, and improving the stability of the worm spring 5 in providing compensation. In some embodiments, please refer to Figure 10 The lens transmission assembly also includes a push motor 72, which is connected to the push member 6 and drives the push member 6 to move. Using the push motor 72 as the power device to drive the push member 6 allows for better control of its movement and improves work efficiency.

[0034] In some embodiments, please refer to Figure 2 , Figure 5 , Figure 11 as well as Figure 12The housing 1 has a first mounting groove 15. The lens transmission assembly also includes a protective housing 9, which is disposed in the first mounting groove 15. The pusher 6 is disposed inside the protective housing 9. The protective housing 9 has a third through hole 91, which allows the pusher 6 to extend out and abut against the worm gear spring 5. The lens transmission assembly also includes a limiting member 83, which passes through the second worm wheel 82. The protective housing 9 includes a protective cylinder 92, which is sleeved on the pusher 6. One end of the limiting member 83 abuts against the protective cylinder 92, and the other end of the limiting member 83 abuts against the protective housing 9. By setting up the protective housing 9 and placing the pusher 6 inside the protective housing 9, the pusher 6 can be protected. The third through hole 91 in the protective housing 9 allows the pusher 6 to pass through the third through hole 91 and push against the worm gear spring 5. The third through hole 91 provides positioning and guidance for the pusher 6, which helps to improve the efficiency of the pusher 6 in pushing against the worm gear spring 5. Furthermore, the limiting member 83 provided on the second worm gear 82 can limit the longitudinal displacement of the second worm gear 82, reducing the displacement error of the pushing member 6 caused by the longitudinal displacement of the second worm gear 82. The protective sleeve 92 provided on the protective shell 9 and fitted onto the pushing member 6 can provide better protection for the pushing member 6.

[0035] In some embodiments, please refer to Figure 3 and Figure 4The lens transmission assembly also includes a motor 71, and the worm gear spring 5 includes a first spring 51, a second spring 52, and a third spring 53. The first spring 51 is connected to the second spring 52, and the second spring 52 is connected to the third spring 53. The first spring 51 has a first through hole 511, and the second spring 52 has a second through hole 521. The motor 71 passes through the first through hole 511 and the second through hole 521 and is connected to the worm gear 3. Along the axial direction of the worm gear 3, the first spring 51 and the second spring 52 are arranged sequentially. The first spring 51 abuts against the worm gear 3. Along the axial direction of the worm gear 3, the third spring 53 extends in a direction away from the second spring 52, and at least part of the third spring 53 forms an angle with the axial direction of the worm gear 3. The third spring 53 is used to abut against the pusher 6. The first spring plate 51 and the second spring plate 52 are arranged sequentially along the axial direction of the worm 3, with the first spring plate 51 abutting against the worm 3. The first spring plate 51 and the second spring plate 52 can deform along the axial direction of the worm 3 and provide elastic force to the worm 3, which helps to improve the compensation efficiency of the worm spring plate 5 in the axial direction of the worm 3. A motor 71 is connected to the worm 3, and the rotation efficiency of the worm 3 is improved through the transmission of the motor 71. A first through hole 511 is opened in the first spring plate 51, and a second through hole 521 is opened in the second spring plate 52. The motor 71 is inserted into the first through hole 511 and the second through hole 521, which improves the compactness of the structure of the motor 71 and the worm 3, reduces the transmission path, helps to improve the transmission efficiency, and saves internal space. The third spring plate 53 allows the pushing member 6 to apply force to the worm spring plate 5 through the third spring plate 53. The third spring plate 53 deforms and transmits the elastic force to the worm 3 through the first spring plate 51 and the second spring plate 52, making the worm 3 mesh more tightly with the worm wheel structure 41. This can compensate for the displacement difference of the worm 3 in the direction of rotation, i.e., the direction perpendicular to the axial direction of the worm 3, during the transmission process, which is beneficial to improving the compensation efficiency of the worm spring plate 5 and reducing lens jitter.

[0036] In some embodiments, please refer to Figure 4 The worm gear seat 2 has a second mounting groove 21, and the worm 3 is rotatably mounted in the second mounting groove 21. By having the worm gear seat 2 have a second mounting groove 21 and rotatably mounting the worm 3 in the second mounting groove 21, interference and disturbance from other components to the worm 3 during the meshing transmission with the worm wheel structure 41 can be reduced. This is beneficial to improving the stability of the meshing transmission of the worm 3 and, consequently, the stability of the transmission of the lens 4.

[0037] In some embodiments, please refer to Figures 5 to 7The housing 1 has a first connecting groove 11 and a second connecting groove 12. Along the first direction X, the worm gear seat 2 includes a first connecting arm 22 and a second connecting arm 23 disposed opposite to each other. The first connecting arm 22 extends at least partially into the first connecting groove 11, and the second connecting arm 23 extends at least partially into the second connecting groove 12. By providing the first connecting arm 22 and the second connecting arm 23 in the worm gear seat 2, and the first connecting groove 11 and the second connecting groove 12 in the housing 1, and by correspondingly placing the two connecting arms within the two connecting grooves, when the worm 3 meshes with the lens 4 to drive the worm gear seat 2 to rotate, the connecting grooves provide constraint on the connecting arms, making the connection between the worm gear seat 2 and the housing 1 more stable, which is beneficial for improving the stability of the image. In some embodiments, please refer to... Figure 5 , Figure 8 as well as Figure 9 The lens 4 includes a third connecting arm 42 and a fourth connecting arm 43, and the housing 1 includes a third connecting groove 13 and a fourth connecting groove 14. The third connecting arm 42 includes a first ball joint 421, and the fourth connecting arm 43 includes a second ball joint 431. The first ball joint 421 is disposed in the third connecting groove 13, and the second ball joint 431 is disposed in the fourth connecting groove 14. The third ball joint and the fourth ball joint are provided on the third connecting arm 42 and the fourth connecting arm 43 of the lens 4. The ball joints can reduce interference with the housing 1 when the lens 4 rotates, and the contact surface between the ball joint and the housing 1 is curved, making the rotation of the lens 4 smoother and improving the smoothness of the image when the lens 4 is adjusted.

[0038] In some embodiments, please refer to Figures 5 to 7 Along the second direction Y, the first connecting arm 22 includes a first arc surface 221 and a second arc surface 222 arranged opposite to each other, and the second connecting arm 23 includes a third arc surface 231 and a fourth arc surface 232 arranged opposite to each other. The first connecting groove 11 includes a fifth arc surface 111, and the second connecting groove 12 includes a sixth arc surface 121. The first arc surface 221 and the second arc surface 222 contact the fifth arc surface 111, and the third arc surface 231 and the fourth arc surface 232 contact the sixth arc surface 121. The second direction Y is perpendicular to the first direction X. The arc surfaces on the first connecting arm 22 and the second connecting arm 23 can limit the non-working displacement of the worm gear seat 2 during the transmission of the lens 4, reduce the shaking of the lens 4 during transmission, and the arc surfaces in the first connecting groove 11 and the second connecting groove 12 cooperate with the arc surfaces on the first connecting arm 22 and the second connecting arm 23, making the rotation of the worm gear seat 2 smoother and improving the stability of the lens 4 during adjustment.

[0039] In this application, the worm 3 is mounted on the worm seat 2, which is connected to the housing 1, forming a relatively stable support structure for the worm 3. The worm wheel structure 41 of the lens 4 meshes with the worm 3. When the motor 71 drives the worm 3 to rotate, it drives the worm wheel structure 41 to rotate, thereby causing the lens 4 to deflect and the reflection angle to be adjusted. The worm spring 5 generates elastic force to compensate for the displacement of the worm 3 when the worm 3 and the worm wheel structure 41 are meshing, making the transmission of the lens 4 more stable. The pusher 6 can be used when needed, such as when the lens 4 of a vehicle HUD experiences significant vibration due to complex road conditions, and the meshing of the worm 3 and the worm wheel structure 41 is not stable enough. In this case, the pusher 6 can actively push the worm spring 5, improving the compensation efficiency of the worm spring 5 for the worm 3 before significant vibration occurs, making the meshing between the worm 3 and the worm wheel structure 41 tighter, reducing the vibration of the lens 4, and thus reducing image jitter.

[0040] Secondly, this application proposes a projection display device, including a lens transmission assembly as described in any embodiment of the first aspect. The vehicle-mounted system includes sensors and a controller. The sensors detect road conditions and output road condition signals to the controller. The controller controls the rotation of a pusher 6 to push against the worm gear spring 5. By detecting road conditions through the sensors and transmitting signals to the controller, the controller controls the pusher 6 to push against the worm gear spring 5 according to the road condition signals. This allows the worm gear spring 5 to actively compensate for the displacement difference of the worm gear 3, which helps reduce the shaking of the lens 4 and improves image stability. The projection display device includes a head-up display, a light field screen, a projection vehicle light, an AR device, a VR device, and a wearable device.

[0041] Thirdly, this application proposes a vehicle comprising a projection display device, a sensor, and a first controller as described in any embodiment of the second aspect. The projection display device includes a second controller, and the first and second controllers are communicatively connected, including direct and indirect connections. The sensor is used to detect road conditions and / or driving status, and outputs road condition and / or driving status signals to the first controller. The first controller is configured to output a first signal based on the road condition and / or driving status signals, and the second controller is configured to acquire the first signal and output a control signal based on the first signal. The control signal is used to control the operating state and / or degree of abutment 6.

[0042] The driving state includes an emergency braking state. When the road surface is bumpy and / or the driving state is in an emergency braking state, the first controller generates a first signal. The second controller, based on the first signal, determines that the current road condition is bumpy and / or the emergency braking state, generates a control signal, and controls the pusher 6 to start and push the worm gear spring 5. When the road surface is flat and there is no emergency braking, the second controller, based on the first signal, determines that the current road condition is not bumpy and / or the emergency braking state, and therefore does not start the pusher 6.

[0043] The degree of resistance can be categorized, for example, based on the degree of road bumpiness and / or the severity of emergency braking, into multiple levels. For instance, the degree of road bumpiness can be divided into a first level and a second level. The vibration at the first level is greater than that at the second level. When the vehicle is in the first level of bumpiness, the resisting component 6 activates and pushes the worm gear spring 5 at the first level of resistance. When the vehicle is in the second level of bumpiness, the resisting component 6 activates and pushes the worm gear spring 5 at the second level of resistance. The displacement distance of the resisting component 6 at the first level of resistance is greater than that at the second level of resistance. That is, at the first level of resistance, the resisting component 6 ensures a tighter meshing between the worm 3 and the worm wheel structure 41 than at the second level of resistance. Similarly, emergency braking can also be categorized into different degrees, with different degrees of resistance from the resisting component 6, which will not be elaborated upon here.

[0044] It is understood that transportation vehicles include, but are not limited to, various vehicles that can use projection display devices, such as automobiles, airplanes, and ships. Taking an automobile as an example, the sensor can be a lidar, which transmits road condition information to the vehicle's infotainment system. The vehicle's infotainment system processes the information and transmits it to the second controller of the projection display device. The second controller outputs a control signal to the push motor 72, which controls the movement of the push member 6 based on the control signal. The automobile also includes a gateway unit, and the projection display device includes a receiving unit. The gateway unit includes a CAN gateway or a LIN gateway, and correspondingly, the receiving unit includes a CAN transceiver or a LIN transceiver. The gateway unit is communicatively connected to both the vehicle's infotainment system and the receiving unit, and the receiving unit is communicatively connected to the second controller. The first signal passes through the gateway unit and the receiving unit and is finally transmitted to the second controller.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A lens transmission assembly, comprising a housing and a worm gear seat, wherein the worm gear seat is disposed in the housing, characterized in that, The lens transmission assembly also includes: The worm gear is rotatably mounted on the worm gear seat; A lens is rotatably mounted on the housing; the lens includes a worm gear structure that meshes with the worm. A worm spring is disposed on the worm seat, and the worm spring abuts against the worm; A pusher is rotatably disposed on the housing, one end of the pusher is disposed toward the spring piece, and the pusher is configured to push against the worm gear spring piece.

2. The lens transmission assembly according to claim 1, characterized in that, The lens transmission assembly further includes a second worm and a second worm wheel, the second worm wheel being sleeved on the pusher member, and the second worm meshing with the second worm wheel.

3. The lens transmission assembly according to claim 1 or 2, characterized in that, The lens transmission assembly also includes a push motor, which is connected to the push member and is used to drive the push member to move.

4. The lens transmission assembly according to claim 2, characterized in that, The housing has a first mounting groove, and the lens transmission assembly also includes a protective shell. The protective shell is disposed in the first mounting groove, and the pusher is disposed inside the protective shell. The protective shell has a third through hole, which is used for the pusher to extend out and abut against the worm gear spring. The lens transmission assembly further includes a limiting member, which passes through the second worm gear. The protective shell includes a protective cylinder, which is sleeved on the pushing member. One end of the limiting member abuts against the protective cylinder, and the other end of the limiting member abuts against the protective shell.

5. The lens transmission assembly according to claim 1, characterized in that, The lens transmission assembly also includes a motor, and the worm gear spring includes a first spring, a second spring, and a third spring; the first spring is connected to the second spring, and the second spring is connected to the third spring; The first spring has a first through hole, the second spring has a second through hole, and the motor passes through the first through hole and the second through hole and is connected to the worm gear. Along the axial direction of the worm, the first spring and the second spring are arranged sequentially, the first spring abutting against the worm, and along the axial direction of the worm, the third spring extends in a direction away from the second spring, and the third spring at least partially forms an angle with the axial direction of the worm, the third spring being used to abut against the pusher.

6. The lens transmission assembly according to claim 1, characterized in that, The housing has a first connecting groove and a second connecting groove; along a first direction, the worm gear seat includes a first connecting arm and a second connecting arm disposed opposite to each other, the first connecting arm extending at least partially into the first connecting groove, and the second connecting arm extending at least partially into the second connecting groove.

7. The lens transmission assembly according to claim 6, characterized in that, The lens includes a third connecting arm and a fourth connecting arm, and the housing includes a third connecting groove and a fourth connecting groove; the third connecting arm includes a first ball joint, and the fourth connecting arm includes a second ball joint, the first ball joint being disposed in the third connecting groove, and the second ball joint being disposed in the fourth connecting groove.

8. The lens transmission assembly according to claim 6, characterized in that, Along the second direction, the first connecting arm includes a first arc surface and a second arc surface disposed opposite to each other, and the second connecting arm includes a third arc surface and a fourth arc surface disposed opposite to each other; the first connecting groove includes a fifth arc surface, the second connecting groove includes a sixth arc surface, the first arc surface and the second arc surface are in contact with the fifth arc surface, and the third arc surface and the fourth arc surface are in contact with the sixth arc surface; The second direction is perpendicular to the first direction.

9. A projection display device, characterized in that, Includes the lens drive assembly as claimed in any one of claims 1 to 8.

10. A means of transportation, characterized in that, Includes the projection display device, sensor, and first controller as described in claim 9; The projection display device includes a second controller; the first controller and the second controller are communicatively connected. The sensor is used to detect road conditions and / or driving status, and output road condition and / or driving status signals to the first controller; the first controller is configured to output a first signal based on the road condition and / or driving status signals, and the second controller is configured to acquire the first signal and output a control signal based on the first signal, the control signal being used to control the working state and / or pushing degree of the pushing member.

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