Lens structure and projection device

Abstract

The utility model belongs to the field of projection technical equipment especially relates to a lens structure and projection equipment. Lens structure includes: outer tube, has the accommodation cavity, the outer tube is provided with the opening of intercommunication accommodation cavity, the outer tube is provided with the rotating hole of intercommunication accommodation cavity still, and the rotating hole is located the lateral surface of outer tube, inner tube, one end of inner tube is inserted accommodation cavity through the opening, to slide connection outer tube, and can slide along first direction relative outer tube, and drive mechanism, including rotating lever, rack and gear located accommodation cavity, and rack is located inner tube lateral surface, one end of rotating lever is rotationally arranged in rotating hole, and the other end of rotating lever extends to accommodation cavity and connects gear, and gear engages rack, and rotating lever drives gear to rotate under the drive of external torque, to make gear drive inner tube to slide relative outer tube. The utility model through the cooperation of gear and rack can realize the accurate adjustment of inner tube position, improves the use convenience of projection equipment.

Description

Technical Field

[0001] This utility model belongs to the field of projection technology equipment, and in particular relates to a lens structure and projection equipment. Background Technology

[0002] A projector is an optoelectronic device that converts image or video signals into optical images and projects them onto a screen or wall. It is widely used in home entertainment, office meetings, education, and cultural presentations. In practical use, users typically need to adjust the focus based on factors such as projection distance and screen size to ensure image clarity.

[0003] Most common projectors use a telescopic sliding structure between the inner and outer cylinders to achieve focusing. Some products connect the focusing ring to the inner cylinder via a thread, and rotating the focusing ring causes the inner cylinder to move spirally, thus achieving focusing. However, this structure causes the entire inner cylinder to rotate during focusing, resulting in the optical lenses mounted inside rotating synchronously. For sensitive optical components, this rotation can degrade image quality. Furthermore, manufacturing errors and assembly deviations exist in actual assembly, and lens rotation can also cause optical axis misalignment or tilting. This is particularly noticeable in applications requiring a large focusing range, significantly impacting image quality and leading to inconvenience in use. Utility Model Content

[0004] The purpose of this application is to provide a lens structure that addresses the problem of how to improve the ease of use of projection devices.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] Firstly, a lens structure is provided, including:

[0007] The outer cylinder has a receiving cavity, and the outer cylinder has an opening communicating with the receiving cavity. The outer cylinder also has a rotating hole communicating with the receiving cavity, and the rotating hole is located on the side surface of the outer cylinder.

[0008] An inner cylinder, one end of which is inserted into the receiving cavity through the opening to slidably connect to the outer cylinder and is capable of sliding relative to the outer cylinder along a first direction; and

[0009] The driving mechanism includes a rotating rod, a rack, and a gear located in the accommodating cavity. The rack is located on the side surface of the inner cylinder. One end of the rotating rod is rotatably disposed in the rotating hole, and the other end of the rotating rod extends into the accommodating cavity and is connected to the gear. The gear meshes with the rack. Under the drive of an external torque, the rotating rod drives the gear to rotate, so that the gear drives the inner cylinder to slide relative to the outer cylinder.

[0010] In some embodiments, the rack is arranged on the groove wall of the positioning groove.

[0011] In some embodiments, the driving mechanism further includes a sealing ring and a limiting bottom cover located in the accommodating cavity. The sealing ring is pressed between the limiting bottom cover and the cavity wall of the accommodating cavity. The limiting bottom cover is connected to the outer cylinder. The limiting bottom cover has an avoidance hole corresponding to the position of the rotating hole. The rotating rod passes through the avoidance hole, and the sealing ring is sleeved on the rotating rod.

[0012] In some embodiments, a first annular groove is formed on the inner surface of the outer cylinder, the first annular groove is arranged circumferentially around the rotating hole, the limiting bottom cover is formed with a second annular groove, the second annular groove is arranged circumferentially around the clearance hole, a portion of the sealing ring is located in the first annular groove, and another portion of the sealing ring is located in the second annular groove.

[0013] In some embodiments, the lens structure further includes an auxiliary sliding assembly located in the receiving cavity and used to guide the sliding of the inner cylinder relative to the outer cylinder. The sliding assembly includes a roller and a rotating shaft rotatably connected to and supporting the roller, the surface of the roller slidingly abutting against the side surface of the inner cylinder.

[0014] In some embodiments, the axial direction of the rotating shaft is arranged along a second direction, or the axial direction of the rotating shaft is arranged along a third direction, wherein the first direction, the second direction, and the third direction are orthogonal to each other.

[0015] In some embodiments, the side surface of the inner cylinder is recessed to form a guide groove, and the rolling wheel abuts against the inner wall of the guide groove.

[0016] In some embodiments, a plurality of auxiliary sliding components are arranged, and each auxiliary sliding component is arranged at circumferential intervals along the inner cylinder.

[0017] In a second aspect, a projection device is provided, which includes the lens structure.

[0018] The beneficial effects of this application are as follows: Through the cooperation of gears and racks, only a torque needs to be applied to the rotating rod to achieve linear sliding of the inner cylinder relative to the outer cylinder, avoiding the problem of inner cylinder rotation caused by traditional threaded focusing. Furthermore, the cooperation of gears and racks enables precise adjustment of the inner cylinder position. By converting the rotational motion of the rotating rod into the linear motion of the inner cylinder, it ensures that the optical lens moves only along the length of the outer or inner cylinder, maintaining optical axis stability. This improves focusing accuracy and image quality, ultimately enhancing the ease of use of the projection equipment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the lens structure provided in the embodiments of this application;

[0021] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the lens structure;

[0022] Figure 3 yes Figure 2 A magnified view of a portion at point A;

[0023] Figure 4 yes Figure 1 An exploded diagram of the lens structure.

[0024] The following are the labeling elements in the figure:

[0025] 100. Lens structure; 10. Outer tube; 20. Inner tube; 30. Drive mechanism; 40. Auxiliary sliding assembly; 50. Positioning screw; 11. Accommodating cavity; 31. Rack; 32. Gear; 33. Rotating rod; 34. Knob; 35. Sealing ring; 36. Limiting bottom cover; 361. Second annular groove; 41. Rolling wheel; 42. Rotating shaft; 12. Rotating hole; 111. Opening; 21. Positioning groove; 22. Guide groove; 362. Clearance hole; 121. First annular groove. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are for ease of description only, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0028] Please see Figures 1 to 3 This application provides a lens structure 100 and a projection device having the same.

[0029] Please see Figures 2 to 4 The lens structure 100 includes an outer cylinder 10, an inner cylinder 20, and a drive mechanism 30. Both the outer cylinder 10 and the inner cylinder 20 are hollow structures. The inner cylinder 20 can be used to house optical components, which include multiple optical lenses. The cross-sectional shape of both the inner cylinder 20 and the outer cylinder 10 can be circular.

[0030] Please see Figures 2 to 4 The outer cylinder 10 has a receiving cavity 11. The surface of the outer cylinder 10 is also provided with an opening 111 communicating with the receiving cavity 11. The surface of the outer cylinder 10 is also provided with a rotating hole 12 communicating with the receiving cavity 11. The rotating hole 12 is located on the side surface of the outer cylinder 10, while the opening 111 is located on the end face of one end of the outer cylinder 10. That is, the rotating hole 12 and the opening 111 are located on two different surfaces of the outer cylinder 10. The shape of the opening 111 is adapted to the shape of the inner cylinder 20, so that the inner cylinder 20 can be inserted into the receiving cavity 11 from the opening 111. The cross-sectional shape of the rotating hole 12 is circular.

[0031] Please see Figures 2 to 4 One end of the inner cylinder 20 is inserted into the receiving cavity 11 through the opening 111 to slidably connect to the outer cylinder 10. The inner cylinder 20 can slide relative to the outer cylinder 10 along a first direction. It can be understood that the first direction can be the length direction of the outer cylinder 10 and can be represented by X. Under the drive of an external force, the inner cylinder 20 can slide into the receiving cavity 11 along the length direction of the outer cylinder 10 or slide out of the receiving cavity 11 along the length direction of the outer cylinder 10, thereby adjusting the focal length of the optical component.

[0032] The driving mechanism 30 includes a rotating rod 33, a rack 31, and a gear 32 located in the accommodating cavity 11. The rack 31 is located on the side surface of the inner cylinder 20, and the gear 32 meshes with the rack 31. One end of the rotating rod 33 is rotatably disposed in the rotating hole 12, and the other end of the rotating rod 33 extends into the accommodating cavity 11 and connects to the gear 32. Under the drive of an external torque, the rotating rod 33 drives the gear 32 to rotate, so that the gear 32 drives the inner cylinder 20 to slide relative to the outer cylinder 10. It can be understood that the rotation direction of the gear 32 determines the sliding direction of the inner cylinder 20. By changing the rotation direction of the gear 32, the sliding direction of the inner cylinder 20 can be changed. For example, when the gear 32 rotates clockwise, the inner cylinder 20 slides into the accommodating cavity 11 along the length direction of the outer cylinder 10; when the gear 32 rotates counterclockwise, the inner cylinder 20 slides out of the accommodating cavity 11 along the length direction of the outer cylinder 10.

[0033] Please see Figures 2 to 4 The lens structure 100 provided in this application embodiment, through the cooperation of gear 32 and rack 31, allows for linear sliding of the inner cylinder 20 relative to the outer cylinder 10 with only a torque applied to the rotating rod 33, avoiding the rotation problem of the inner cylinder 20 caused by traditional threaded focusing. Furthermore, the cooperation of gear 32 and rack 31 enables precise adjustment of the position of the inner cylinder 20. By converting the rotational motion of the rotating rod 33 into the linear motion of the inner cylinder 20, it ensures that the optical lens moves only along the length of the outer cylinder 10 or the inner cylinder 20, maintaining optical axis stability. This improves focusing accuracy and image quality, ultimately enhancing the ease of use of the projection device.

[0034] Optionally, the drive mechanism 30 also includes a knob 34 connected to the exposed end of the rotating rod 33, which the user can operate to drive the rotating rod 33 to rotate.

[0035] Please see Figures 2 to 4 In some embodiments, the side surface of the inner cylinder 20 is recessed and forms a positioning groove 21, the rack 31 is located in the positioning groove 21, and the gear 32 is at least partially located in the positioning groove 21 and meshes with the rack 31.

[0036] Optionally, by arranging the rack 31 in the positioning groove 21 and forming the positioning groove 21 recessed toward the inner wall of the inner cylinder 20, the overall size of the lens structure 100 can be reduced, making the size of the lens structure 100 in the radial direction along the inner cylinder 20 or the outer cylinder 10 sufficiently small, which is beneficial to the compact layout and transmission stability of the drive mechanism 30.

[0037] Please see Figures 2 to 4The positioning groove 21 provides installation space for the rack 31 and gear 32, allowing the rack 31 to be positioned to ensure more precise meshing between the gear 32 and the rack 31, reducing meshing deviations caused by machining or assembly errors. Simultaneously, the groove constrains the radial offset of the gear 32, enhancing the smoothness of the inner cylinder 20's sliding. This design, while maintaining the advantages of linear focusing, further improves transmission efficiency and focusing accuracy, making it suitable for projection equipment requiring high-precision imaging.

[0038] Please see Figures 2 to 4 In some embodiments, the rack 31 is arranged on the groove wall of the positioning groove 21.

[0039] Optionally, the plane determined by the rotation trajectory of the gear 32 is parallel to the bottom of the positioning groove 21, so that the gear 32 can be completely housed in the positioning groove 21, reducing the overall size of the lens structure 100. Moreover, by installing the rack 31 on the groove wall of the positioning groove 21, the installation stability of the rack 31 can be improved. The rack 31 can be glued to the groove wall of the positioning groove 21 by adhesive or screwed to the groove wall of the positioning groove 21 by screws.

[0040] Please see Figures 2 to 4 The rack 31 is fixed to the groove wall of the positioning groove 21, which can effectively withstand the force when the gear 32 meshes, reducing the risk of deformation or displacement of the rack 31 due to force. The groove wall of the positioning groove 21 enhances the rigidity of the rack 31, ensuring stable meshing between the gear 32 and the rack 31, thereby improving the smoothness of the inner cylinder 20 sliding.

[0041] Please see Figures 2 to 4 In some embodiments, the drive mechanism 30 further includes a sealing ring 35 and a limiting bottom cover 36 located in the accommodating cavity 11. The limiting bottom cover 36 is connected to the outer cylinder 10. The limiting bottom cover 36 has an avoidance hole 362 at the position corresponding to the rotating hole 12. The rotating rod 33 passes through the avoidance hole 362. The sealing ring 35 is sleeved on the rotating rod 33. The sealing ring 35 is pressed between the limiting bottom cover 36 and the cavity wall of the accommodating cavity 11, that is, the limiting bottom cover 36 presses the sealing ring 35 against the cavity wall of the accommodating cavity 11.

[0042] Please see Figures 2 to 4 Optionally, the sealing ring 35 is fitted over the rotating rod 33, which effectively improves the sealing performance and environmental adaptability of the lens structure 100. This prevents dust or moisture from entering the receiving cavity 11 due to gaps at the rotating hole 12, thus affecting the performance of internal optical components or mechanical parts. The sealing ring 35 effectively seals the gap between the rotating hole 12 and the rotating rod 33, preventing external impurities from entering the receiving cavity 11.

[0043] Please see Figures 2 to 4In some embodiments, the inner surface of the outer cylinder 10 is provided with a first annular groove 121, which is arranged circumferentially around the rotating hole 12. The limiting bottom cover 36 is provided with a second annular groove 361, which is arranged circumferentially around the clearance hole 362. The sealing ring 35 is partially located in the first annular groove 121, and the other part of the sealing ring 35 is located in the second annular groove 361.

[0044] It is understandable that the first annular groove 121 and the second annular groove 361 together form a space for accommodating the sealing ring 35, which keeps the sealing ring 35 stable during the rotation of the rotating rod 33 and improves the sealing performance of the sealing ring 35.

[0045] Alternatively, the sealing ring 35 can be made of rubber or silicone.

[0046] Please see Figures 1 to 3 In some embodiments, the lens structure 100 further includes an auxiliary sliding assembly 40, which is located in the receiving cavity 11 and is used to guide the inner cylinder 20 to slide relative to the outer cylinder 10. The sliding assembly includes a roller 41 and a rotating shaft 42 that is rotatably connected to and supports the roller 41. The wheel surface of the roller 41 slides against the side surface of the inner cylinder 20.

[0047] Optionally, the surface of the roller 41 that abuts against the inner cylinder 20 is a rotating surface. When the inner cylinder 20 slides relative to the outer cylinder 10, there is rolling friction between the roller 41 and the inner cylinder 20. The rolling friction of the roller 41 can partially replace the sliding friction, reducing the frictional resistance of the inner cylinder 20 sliding relative to the outer cylinder 10 and improving the smoothness of the inner cylinder 20 sliding and the focusing efficiency.

[0048] Please see Figures 1 to 3 In some embodiments, the axial direction of the rotating shaft 42 is arranged along a second direction, which can be represented as Y. In this embodiment, the second direction is parallel to the cross-section of the inner cylinder 20 or the outer cylinder 10, thereby reducing the frictional resistance of the inner cylinder 20 sliding relative to the outer cylinder 10 through the rolling wheel 41.

[0049] Please see Figures 1 to 3 In some embodiments, the axial direction of the rotating shaft 42 is arranged along a third direction, which can be represented as Z, and the second direction is perpendicular to the third direction. It can be understood that the axial direction of the rotating shaft 42 is along the radial direction of the inner cylinder 20 or the outer cylinder 10, and the plane determined by the rotation trajectory of the rolling wheel 41 is parallel to the length direction of the inner cylinder 20 or the length direction of the outer cylinder 10, thereby reducing the frictional resistance of the inner cylinder 20 sliding relative to the outer cylinder 10 through the rolling wheel 41.

[0050] Please see Figures 1 to 3The first direction, the second direction, and the third direction are all orthogonal to each other.

[0051] Please see Figures 2 to 4 In some embodiments, the side surface of the inner cylinder 20 is recessed to form a guide groove 22, and the rolling wheel 41 abuts against the inner wall of the guide groove 22.

[0052] It is understandable that when the axial direction of the rotating shaft 42 is arranged along the second direction, the surface of the rolling wheel 41 abuts against the bottom of the guide groove 22, and when the axial direction of the rotating shaft 42 is arranged along the third direction, the surface of the rolling wheel 41 abuts against the groove wall on one side of the guide groove 22.

[0053] Optionally, the cooperation between the rolling wheel 41 and the inner wall of the guide groove 22 improves the sliding accuracy and stability of the inner cylinder 20. The cooperation between the guide groove 22 and the rolling wheel 41 can also constrain the sliding path of the inner cylinder 20, reducing the offset or shaking of the inner cylinder 20 caused by machining errors or external forces.

[0054] Optionally, the positioning groove 21 and the guide groove 22 are located on opposite sides of the inner cylinder 20, and the driving force of the gear 32 acting on the rack 31 and the force between the rolling wheel 41 and the inner cylinder 20 are symmetrically arranged, so that the inner cylinder 20 can maintain a force balance.

[0055] Please see Figures 2 to 4 In some embodiments, multiple auxiliary sliding components 40 may be arranged at intervals along the length of the inner cylinder 20 or the length of the outer cylinder 10, with each auxiliary sliding component 40 arranged linearly.

[0056] Please see Figures 2 to 4 In some embodiments, multiple auxiliary sliding components 40 are arranged, and each auxiliary sliding component 40 is arranged at intervals along the circumference of the inner cylinder 20.

[0057] Optionally, in this embodiment, four auxiliary sliding components 40 are provided, and the four auxiliary sliding components 40 are arranged with equal arc around the circumference of the inner cylinder 20. That is, auxiliary sliding components 40 are arranged in all four directions of the inner cylinder 20, thereby further improving the smoothness of the sliding of the inner cylinder 20. Moreover, the circumferential distribution of multiple rolling wheels 41 ensures that the inner cylinder 20 receives balanced support at multiple points during sliding, reducing the problem of local stress concentration or sliding instability that may be caused by single-point contact.

[0058] Please see ​Optionally, a positioning screw 50 is also screwed onto the outer cylinder 10. After the inner cylinder 20 slides into position relative to the outer cylinder 10, rotating the positioning screw 50 causes one end of the positioning screw 50 to abut against the side surface of the inner cylinder 20, thereby stabilizing the inner cylinder 20 relative to the outer cylinder 10. When it is necessary to drive the inner cylinder 20 to slide relative to the outer cylinder 10, the positioning screw 50 can be loosened first to release the positioning of the inner cylinder 20.

[0059] This utility model also proposes a projection device, which includes a lens structure 100. The specific structure of the lens structure 100 is as described in the above embodiments. Since this projection device adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0060] In some embodiments, the projection device further includes a bracket for fixing and positioning the lens structure 100.

[0061] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A lens structure (100), characterized in that, include: The outer cylinder (10) has a receiving cavity (11), the outer cylinder (10) has an opening (111) communicating with the receiving cavity (11), the outer cylinder (10) also has a rotating hole (12) communicating with the receiving cavity (11), the rotating hole (12) is located on the side surface of the outer cylinder (10); Inner cylinder (20), one end of which is inserted into the receiving cavity (11) through the opening (111) to slidably connect to the outer cylinder (10) and can slide relative to the outer cylinder (10) in a first direction; as well as The drive mechanism (30) includes a rotating rod (33), a rack (31), and a gear (32) located in the accommodating cavity (11). The rack (31) is located on the side surface of the inner cylinder (20). One end of the rotating rod (33) is rotatably disposed in the rotating hole (12), and the other end of the rotating rod (33) extends into the accommodating cavity (11) and is connected to the gear (32). The gear (32) meshes with the rack (31). The rotating rod (33) drives the gear (32) to rotate under the drive of an external torque, so that the gear (32) drives the inner cylinder (20) to slide relative to the outer cylinder (10).

2. The lens structure (100) as described in claim 1, characterized in that: The side surface of the inner cylinder (20) is recessed and formed into a positioning groove (21), the rack (31) is located in the positioning groove (21), and the gear (32) is at least partially located in the positioning groove (21) and meshes with the rack (31).

3. The lens structure (100) as described in claim 2, characterized in that: The rack (31) is arranged on the groove wall of the positioning groove (21).

4. The lens structure (100) as described in any one of claims 1-3, characterized in that: The drive mechanism (30) further includes a sealing ring (35) and a limiting bottom cover (36) located in the accommodating cavity (11). The sealing ring (35) is pressed between the limiting bottom cover (36) and the cavity wall of the accommodating cavity (11). The limiting bottom cover (36) is connected to the outer cylinder (10). The limiting bottom cover (36) has an avoidance hole (362) corresponding to the position of the rotating hole (12). The rotating rod (33) passes through the avoidance hole (362), and the sealing ring (35) is sleeved on the rotating rod (33).

5. The lens structure (100) as described in claim 4, characterized in that: The inner surface of the outer cylinder (10) is provided with a first annular groove (121), which is arranged around the circumference of the rotating hole (12). The limiting bottom cover (36) is provided with a second annular groove (361), which is arranged around the circumference of the clearance hole (362). Part of the sealing ring (35) is located in the first annular groove (121), and the other part of the sealing ring (35) is located in the second annular groove (361).

6. The lens structure (100) as described in any one of claims 1-3, characterized in that: The lens structure (100) further includes an auxiliary sliding assembly (40), which is located in the receiving cavity (11) and is used to guide the inner cylinder (20) to slide relative to the outer cylinder (10). The sliding assembly includes a roller (41) and a rotating shaft (42) rotatably connected to and supporting the roller (41). The wheel surface of the roller (41) slides against the side surface of the inner cylinder (20).

7. The lens structure (100) as described in claim 6, characterized in that: The axial direction of the rotating shaft (42) is arranged along the second direction, or the axial direction of the rotating shaft (42) is arranged along the third direction, and the first direction, the second direction and the third direction are orthogonal to each other.

8. The lens structure (100) as described in claim 7, characterized in that: The inner cylinder (20) has a recessed side surface forming a guide groove (22), and the rolling wheel (41) abuts against the inner wall of the guide groove (22).

9. The lens structure (100) as described in claim 7, characterized in that: Multiple auxiliary sliding components (40) are arranged, and each auxiliary sliding component (40) is arranged at intervals along the circumference of the inner cylinder (20).

10. A projection device, characterized in that, Includes the lens structure (100) as described in any one of claims 1-9.

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