A focal length adjustable lens barrel structure and a laser radar

Abstract

This application discloses a focal length adjustable lens barrel structure and a lidar, comprising: a base, including a fixed plate and a first fixed seat and a second fixed seat; a rotating part, including a gear sleeve rotatably mounted on the first fixed seat about a fixed axis, the gear sleeve having an internal thread, and a first gear fitted on the gear sleeve; a fixed part, fixedly mounted on the second fixed seat, one end of the fixed part extending into the gear sleeve, the other end of the fixed part having a lens barrel, and a cylindrical pin extending radially on the fixed part; a movable sleeve, embedded in the gear sleeve and threadedly connected to the internal thread on the gear sleeve, the movable sleeve having a groove extending axially, the cylindrical pin slidingly extending into the groove, and a fiber optic flange seat inside the movable sleeve; and a driving part, including a driving component fixedly mounted on the fixed plate, the power end of the driving component having a second gear, the second gear meshing with the first gear for transmission. This application can achieve precise adjustment of the lens barrel focal length, has a simple structure, and is stable and reliable in operation.

Description

Technical Field

[0001] This application relates to the field of optical focusing technology, and in particular to a focal length adjustable lens barrel structure and a lidar. Background Technology

[0002] Lidar measurements of atmospheric wind fields rely on optical tubes for transmitting and receiving light paths. To achieve long-distance measurement, the focal point of the tube needs to be configured for the far field.

[0003] Currently, with the adoption of traditional mechanical focusing schemes, the radar system's telescope barrel cannot be readjusted after leaving the factory and can only operate using the factory-configured settings. This results in the inability to achieve long-stroke adjustment, and the focal length adjustment of the radar system's telescope barrel is limited, leading to insufficient accuracy in meteorological data such as wind measurements.

[0004] Therefore, based on the above-mentioned technical problems, how to provide a lens barrel structure with a precisely adjustable focal length is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a focal length adjustable lens barrel structure and a lidar, which can achieve precise adjustment of the lens barrel focal length, has a simple structure, and is stable and reliable in operation.

[0006] To achieve the above objectives, this application provides a focal length adjustable lens barrel structure, comprising:

[0007] The base includes a fixing plate and a first fixing seat and a second fixing seat disposed on the fixing plate;

[0008] The rotating part includes a gear sleeve rotatably mounted on the first fixed seat about a fixed axis, the gear sleeve having an internal thread, and a first gear being fitted on the gear sleeve;

[0009] A fixing part is fixedly disposed on the second fixing seat. One end of the fixing part extends into the gear sleeve, and the other end of the fixing part is provided with a mirror tube. A cylindrical pin extending radially is provided on the fixing part extending into the gear sleeve.

[0010] A movable sleeve is embedded in the gear sleeve and threadedly connected to the internal thread on the gear sleeve. The movable sleeve is provided with an axially extending groove. The cylindrical pin slides into the groove to restrict the movable sleeve to move only along its axial direction. The movable sleeve is provided with an optical fiber flange seat.

[0011] The driving unit includes a driving member fixedly mounted on the fixed plate. The power end of the driving member is provided with a second gear, which meshes with the first gear for transmission.

[0012] Preferably, the fixing part includes a sleeve fixedly disposed on the second fixing seat and a locking ring screwed to the end of the sleeve. The locking ring extends into the gear sleeve and is rotatably disposed relative to the gear sleeve. The cylindrical pin is disposed on the locking ring and protrudes a predetermined length radially toward the axis of the locking ring.

[0013] Preferably, the locking ring is sleeved on the outer periphery of the movable sleeve, the movable sleeve and the locking ring are axially movable, and the movable sleeve has an external thread that engages with the internal thread of the gear sleeve on the side axially away from the locking ring.

[0014] Preferably, the internal thread side of the gear sleeve is close to the locking ring, and a first retaining ring is screwed onto the root of the internal thread on the side close to the locking ring. One end of the locking ring is axially limited and abutted against the first retaining ring, and the other end of the locking ring is axially limited and abutted against the sleeve and the gear sleeve.

[0015] Preferably, the movable sleeve has an internal thread, the optical fiber flange seat is screwed into the movable sleeve, and second retaining rings that engage with the internal thread of the movable sleeve are provided on both sides of the optical fiber flange seat to clamp and fix the optical fiber flange seat in a preset position within the movable sleeve.

[0016] Preferably, the sleeve, the locking ring, the movable sleeve, and the fiber optic flange are coaxially arranged.

[0017] Preferably, the first fixed base is provided with a bearing, and the gear sleeve passes through the bearing and is fixedly connected to the bearing.

[0018] Preferably, the second fixing seat includes a support seat and a fixing piece fixedly connected to the support seat. The fixing piece and the support seat form a through hole structure that is fixedly locked to the outer periphery of the sleeve, and the through hole structure is located in the shoulder of the through hole to limit the axial movement of the sleeve.

[0019] Preferably, the driving component is a servo motor or a stepper motor.

[0020] A lidar includes the aforementioned focal length adjustable lens barrel structure.

[0021] Compared to the aforementioned background technology, this application uses a driving unit to drive a rotating unit to rotate, while a fixed unit is fixedly disposed relative to the rotating unit. Under the limiting action of a cylindrical pin on the fixed unit, the moving sleeve is restricted to move only axially. When the driving unit rotates, under the action of the internal thread of the gear sleeve, and in conjunction with the limiting structure of the cylindrical pin and the slot, the moving sleeve moves precisely axially within the rotating unit, thereby driving the fiber optic flange seat with the optical fiber to move axially. Simultaneously, the lens barrel is disposed on the fixed unit, and the focal length of the lens barrel is adjusted by the circumferential movement of the fiber optic flange seat. Furthermore, the fiber optic flange seat itself does not rotate, achieving the requirements for a tight and stable connection between the optical fiber and the fiber optic flange seat. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the focal length adjustable lens barrel structure provided in an embodiment of this application;

[0024] Figure 2 This is a side view of the focal length adjustable lens barrel structure provided in an embodiment of this application;

[0025] Figure 3 for Figure 2 Sectional view along line AA;

[0026] Figure 4 Exploded views of the fixing part, the movable sleeve, and the fiber optic flange seat provided in the embodiments of this application.

[0027] In the diagram: 1-Fixing plate; 2-First fixing seat; 3-Second fixing seat; 4-Fixing part; 5-Rotating part; 6-Drive part; 7-Fiber optic flange seat; 8-Moving sleeve; 9-First retaining ring;

[0028] 31-Support base; 32-Fixing plate;

[0029] 41-Sleeve; 42-Locking ring; 411-Shoulder; 421-Cylindrical pin;

[0030] 51-Gear sleeve; 52-First gear;

[0031] 61-Driver; 62-Second gear;

[0032] 81-Card slot. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does not 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, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1 As shown, in this embodiment, a focal length adjustable lens barrel structure is provided. This structure includes a base, a rotating part 5, a fixing part 4, a movable sleeve 8, and a driving part 6. The base includes a fixing plate 1 and a first fixing seat 2 and a second fixing seat 3 disposed on the fixing plate 1. The first fixing seat 2 and the second fixing seat 3 provide stable support. Specifically, the rotating part 5 includes a gear sleeve 51 rotatably disposed on the first fixing seat 2 about a fixed axis. The gear sleeve 51 has an internal thread, and a first gear 52 is fixedly disposed on the outside of the gear sleeve 51. The fixing part 4 is fixedly disposed on the second fixing seat 3, with one end of the fixing part 4 extending into the gear sleeve 51 and the other end of the fixing part 4 being disposed on the lens barrel.

[0037] It should be noted that since the rotating part 5 is rotatable and the fixed part 4 is fixed, even if the end of the fixed part 4 extends into the gear sleeve 51, the fixed part 4 will not affect the normal rotation of the rotating part 5, that is, it will not affect the normal rotation of the gear sleeve 51.

[0038] The movable sleeve 8 is embedded within the gear sleeve 51, and the movable sleeve 8 is threadedly engaged with the internal thread on the gear sleeve 51. Simultaneously, the fixed part 4, extending into the gear sleeve 51, is provided with a radially extending cylindrical pin 421. The movable sleeve 8 is provided with an axially extending groove 81, in which the cylindrical pin 421 slides, thus restricting the movable sleeve 8 to move only along its axial direction. When the rotating part 5 rotates, because the movable sleeve 8 is restricted by the cylindrical pin 421, it will only move axially under the action of the thread, and the fiber optic flange seat 7, located within the movable sleeve 8, will also move axially accordingly, achieving focal length adjustment of the lens barrel structure.

[0039] The drive unit 6 includes a drive component 61 fixedly mounted on the fixed plate 1. The power end of the drive component 61 is equipped with a second gear 62, which meshes with the first gear 52 to transmit rotation from the drive component 61 to the gear sleeve 51, causing the gear sleeve 51 to rotate. The drive component 61 can be a servo motor or a stepper motor. The accuracy of the angular rotation achieved by the servo motor or stepper motor enables precise transmission between the gears, thereby achieving precise axial movement of the movable sleeve 8 within the gear sleeve 51. The structure is simple, and the operation is stable and reliable.

[0040] In summary, this application uses a driving unit 6 to drive a rotating unit 5 to rotate. A fixed unit 4 is fixed relative to the rotating unit 5, and the moving sleeve 8 is restricted to axial movement only by the limiting action of the cylindrical pin 421 on the fixed unit 4. When the driving unit 6 rotates, the moving sleeve 8 moves precisely axially within the rotating unit 5 under the action of the internal thread of the gear sleeve 51, and in conjunction with the limiting structure of the cylindrical pin 421 and the slot 81. This drives the fiber optic flange 7, which contains the optical fiber, to move axially. Simultaneously, the lens barrel is mounted on the fixed unit 4, and the focal length of the lens barrel is adjusted by the circumferential movement of the fiber optic flange 7. Furthermore, the fiber optic flange 7 itself does not rotate, achieving the requirements for a secure and stable connection between the optical fiber and the fiber optic flange 7.

[0041] In some embodiments, the fixing part 4 includes a sleeve 41 fixedly disposed on the second fixing base 3 and a locking ring 42 screwed to the end of the sleeve 41. Please refer to Figures 2 to 4 The locking ring 42 extends into the gear sleeve 51 and is rotatably set relative to the gear sleeve 51 to ensure that the gear sleeve 51 is not affected by the locking ring 42 when it rotates.

[0042] Since the movable sleeve 8 is also embedded within the gear sleeve 51, in order to limit the movable sleeve 8 with the cylindrical pin 421 on the fixed part 4, in this embodiment, a locking ring 42 is fitted around the outer periphery of the movable sleeve 8, and the locking ring 42 and the movable sleeve 8 are axially movable. The cylindrical pin 421 is provided on the locking ring 42 and protrudes a predetermined length radially toward the axis of the locking ring 42. The protruding part of the cylindrical pin 421 engages with the slot 81 on the movable sleeve 8. The specific width and depth of the slot 81 can be designed according to the size of the cylindrical pin 421 and the protrusion height of the cylindrical pin 421, and no further restrictions are imposed here. In addition, the movable sleeve 8 has an external thread on the side axially away from the locking ring 42 that engages with the internal thread of the gear sleeve 51, thereby achieving relative axial movement through the threaded engagement between the gear sleeve 51 and the movable sleeve 8.

[0043] The gear sleeve 51 has its internal thread side located near the locking ring 42, and a first retaining ring 9 is screwed onto the root of the internal thread on the side near the locking ring 42. One end of the locking ring 42 is axially restrained and abutted against the first retaining ring 9, and the other end of the locking ring 42 is axially restrained and abutted against the sleeve 41 and the gear sleeve 51. This ensures that the locking ring 42 can be positioned at the fixed position of the gear sleeve 51 and that the cylindrical pin 421 on the locking ring 42 can stably limit the movement of the sleeve 8. At the same time, the first retaining ring 9 can also prevent the movement of the sleeve 8 from getting stuck due to the threaded relief groove.

[0044] It should be noted that a limiting ring is provided on the inner wall of the end of the gear sleeve 51. The limiting ring can abut against the end of the locking ring 42, thereby achieving axial limiting of the locking ring 42. At the same time, there is a certain amount of interference between the two sides of the locking ring 42 and the first retaining ring 9 and the limiting ring, ensuring that the gear sleeve 51 is rotatably set relative to the locking ring 42.

[0045] The movable sleeve 8 is provided with internal threads, and the fiber optic flange seat 7 is locked inside the movable sleeve 8. Second retaining rings that engage with the internal threads of the movable sleeve 8 are provided on both sides of the fiber optic flange seat 7. The fiber optic flange seat 7 is clamped and fixed in a preset position inside the movable sleeve 8 by the two second retaining rings, so as to ensure the fixing effect of the fiber optic flange seat 7.

[0046] Please refer to Figure 4 The sleeve 41, locking ring 42, movable sleeve 8 and fiber optic flange seat 7 of this application are coaxially arranged, which can ensure the assembly error of the lens barrel structure in the radial direction, while avoiding displacement of the movable sleeve 8 in other directions other than the axial direction, and ensuring the precise axial movement of the movable sleeve 8 inside the gear sleeve 51.

[0047] The first fixed seat 2 is equipped with a bearing, and the gear sleeve 51 passes through the inner ring of the bearing and is fixedly connected to the inner ring of the bearing to ensure that the gear sleeve 51 can rotate around the fixed axis. The gear sleeve 51 and the bearing can be fixedly connected by an interference fit, or by other fixing methods, which will not be described in detail here, and all fall within the protection scope of this application.

[0048] The second fixed base 3 includes a support base 31 and a fixing piece 32 fixedly connected to the support base 31. Please refer to... Figure 1 The fixing plate 32 and the support base 31 form a through-hole structure that is fixedly locked to the outer periphery of the sleeve 41. The sleeve 41 is interference-fitted with the through-hole structure to ensure that the fixing part 4 can be fixedly installed. At the same time, the through-hole structure can be set in the shoulder 411 of the through hole to achieve axial limiting of the sleeve 41.

[0049] As can be seen, the lens barrel structure of this application fully considers the stability requirements of optical fibers in actual use. The fiber optic flange seat 7, which is directly connected to the optical fiber, only moves back and forth without rotating itself, thus achieving the requirements of tightness and stability in the connection between the optical fiber and the fiber optic flange seat 7. The focal length of the lens barrel can be adjusted by adjusting the position of the fiber optic flange seat 7 in the axial direction.

[0050] This application also provides a lidar that includes the aforementioned focal length adjustable lens barrel structure.

[0051] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0052] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A focal length adjustable lens barrel structure, characterized in that, include: The base includes a fixing plate (1) and a first fixing seat (2) and a second fixing seat (3) disposed on the fixing plate (1); The rotating part (5) includes a gear sleeve (51) rotatably mounted on the first fixed seat (2) about a fixed axis. The gear sleeve (51) has an internal thread, and a first gear (52) is mounted on the gear sleeve (51). The fixing part (4) is fixedly disposed on the second fixing seat (3). One end of the fixing part (4) extends into the gear sleeve (51), and the other end of the fixing part (4) is provided with a mirror tube. A cylindrical pin (421) extending radially is provided on the fixing part (4) extending into the gear sleeve (51). The movable sleeve (8) is embedded in the gear sleeve (51) and is threadedly connected to the internal thread on the gear sleeve (51). The movable sleeve (8) is provided with a groove (81) extending axially. The cylindrical pin (421) slides into the groove (81) to restrict the movable sleeve (8) to move only along its axial direction. The movable sleeve (8) is provided with an optical fiber flange seat (7). The drive unit (6) includes a drive member (61) fixedly mounted on the fixed plate (1). The power end of the drive member (61) is provided with a second gear (62), which meshes with the first gear (52) for transmission.

2. The focal length adjustable lens barrel structure according to claim 1, characterized in that, The fixing part (4) includes a sleeve (41) fixedly mounted on the second fixing seat (3) and a locking ring (42) screwed to the end of the sleeve (41). The locking ring (42) extends into the gear sleeve (51) and is rotatably mounted relative to the gear sleeve (51). The cylindrical pin (421) is mounted on the locking ring (42) and protrudes a predetermined length radially toward the axis of the locking ring (42).

3. The focal length adjustable lens barrel structure according to claim 2, characterized in that, The locking ring (42) is sleeved on the outer periphery of the movable sleeve (8). The movable sleeve (8) and the locking ring (42) are axially movable. The movable sleeve (8) is provided with an external thread that engages with the internal thread of the gear sleeve (51) on the side axially away from the locking ring (42).

4. The focal length adjustable lens barrel structure according to claim 2, characterized in that, The gear sleeve (51) has an internal thread side close to the locking ring (42), and a first retaining ring (9) is screwed on the root of the internal thread side close to the locking ring (42). One end of the locking ring (42) is axially limited and abutted against the first retaining ring (9), and the other end of the locking ring (42) is axially limited and abutted against the sleeve (41) and the gear sleeve (51).

5. The focal length adjustable lens barrel structure according to claim 1, characterized in that, The movable sleeve (8) is provided with an internal thread, the optical fiber flange seat (7) is screwed into the inside of the movable sleeve (8), and second retaining rings are provided on both sides of the optical fiber flange seat (7) to engage with the internal thread of the movable sleeve (8) so as to clamp and fix the optical fiber flange seat (7) in a preset position inside the movable sleeve (8).

6. The focal length adjustable lens barrel structure according to claim 2, characterized in that, The sleeve (41), the locking ring (42), the movable sleeve (8), and the fiber optic flange seat (7) are coaxially arranged.

7. The focal length adjustable lens barrel structure according to claim 1, characterized in that, The first fixed seat (2) is provided with a bearing, and the gear sleeve (51) passes through the bearing and is fixedly connected to the bearing.

8. The focal length adjustable lens barrel structure according to claim 2, characterized in that, The second fixed seat (3) includes a support seat (31) and a fixed piece (32) fixedly connected to the support seat (31). The fixed piece (32) and the support seat (31) form a through hole structure that is fixedly locked to the outer periphery of the sleeve (41). The through hole structure is located in the shoulder (411) of the through hole to limit the axial movement of the sleeve (41).

9. The focal length adjustable lens barrel structure according to claim 1, characterized in that, The driving component (61) is a servo motor or a stepper motor.

10. A lidar, characterized in that, Includes the focal length adjustable lens barrel structure as described in any one of claims 1-9.

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