Zoom lens

Abstract

The utility model relates to the technical field of optical imaging, in particular to a zoom lens, which comprises a hollow shell; the first lens assembly is installed at an end face opening in one side of the shell; the second lens assembly is coaxially arranged in the shell; the sliding guide mechanism comprises a guide part arranged on the inner wall of the shell, and the guide part is arranged in the axial direction of the shell and can slide relative to the second lens assembly; the driving mechanism is arranged in the shell, connected with the second lens assembly and used for driving the second lens assembly to move in the direction close to or away from the first lens assembly. According to the utility model, the driving mechanism drives the second lens assembly to move along the track of the guide part, so that the focal length of the lens is changed to realize a zooming function, and the zooming stability of the equipment is improved while the overall structure of the equipment is optimized.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging technology, and in particular to a zoom lens. Background Technology

[0002] A zoom lens is a camera lens that can change its focal length within a certain range to obtain different widths of field of view, different sizes of images, and different ranges of objects. A zoom lens can change the shooting range by changing the focal length without changing the shooting distance, which is very beneficial for image composition. Since one zoom lens can perform the function of several fixed focal length lenses, it not only reduces the amount of photography equipment to carry when traveling, but also saves time when changing lenses.

[0003] Currently, zoom lenses used in handheld laser rangefinders and portable rangefinders on the market suffer from significant beam divergence at long distances, which greatly reduces the ranging accuracy of the laser rangefinder system. This is mainly due to the limitations of the zoom lens's mechanical structure. Traditional zoom lens transmission mechanisms struggle to simultaneously meet the dual requirements of high-precision displacement control and resistance to environmental vibrations. For example, in field operations, equipment vibration can cause instantaneous backlash in the gear transmission system, leading to focal length drift. Furthermore, accumulated machining errors in the guide rod-type guiding structure can disrupt the optical axis consistency of the lens group, exacerbating asymmetric beam divergence. In addition, to accommodate the size limitations of portable devices, miniaturized zoom lenses often have to simplify their mechanical structures. Some low-end solutions use simple drive mechanisms with plastic gears and spring preload, but such designs are prone to plastic deformation during repeated zooming operations, leading to wear on the threaded pairs or increased clearance in the slider track.

[0004] Therefore, there is an urgent need for a new type of zoom lens that, while optimizing the overall structural design, utilizes mechanical zoom to improve the zoom stability of the device. Utility Model Content

[0005] In view of at least one of the above technical problems, the present invention provides a zoom lens that adopts structural improvements to enhance the zoom stability of the device.

[0006] According to a first aspect of the present invention, a zoom lens is provided, comprising:

[0007] The outer shell is hollow inside;

[0008] The first lens assembly is mounted on one end face of the housing;

[0009] The second lens assembly is coaxially disposed within the housing;

[0010] A sliding guide mechanism includes a guide portion disposed on the inner wall of the housing, the guide portion being disposed along the axial direction of the housing and being slidably disposed relative to the second lens assembly;

[0011] A drive mechanism, disposed within the housing and connected to the second lens assembly, is used to drive the second lens assembly to move toward or away from the first lens assembly.

[0012] In some embodiments of this utility model, the outer shell is cylindrical and stepped, and the outer shell is divided into a first tube and a second tube. The outer diameter of the first tube is smaller than the outer diameter of the second tube, and the guide portion is disposed on the inner wall of the second tube.

[0013] In some embodiments of this utility model, the first lens assembly includes a first lens and a first housing, the first housing being detachably mounted on the outer end face of the first tube, and the first lens being mounted on the inner side of the first housing.

[0014] In some embodiments of this utility model, the second lens assembly includes a second lens and a second housing, wherein the second housing is disposed at both ends of the second lens.

[0015] In some embodiments of this utility model, the sliding guide mechanism further includes a slide rail and a slider. The guide portion is configured as a straight groove, the slide rail is disposed within the guide portion, and the slider is disposed on the second housing. The slider and the slide rail form a sliding fit.

[0016] In some embodiments of this utility model, the second lens assembly further includes a mounting base, which is disposed on the two second housings, avoiding the slider. The mounting base is perpendicular to the axial direction of the housing, and the two mounting bases are on the same straight line.

[0017] In some embodiments of this utility model, the driving mechanism includes a drive motor and a lead screw. The mounting seat is movably sleeved on the lead screw. The center of the mounting seat is provided with a threaded hole that matches the outer periphery of the lead screw. The drive motor causes the lead screw to rotate, thereby causing the mounting seat to move along the lead screw, which in turn drives the second lens assembly to move along the direction of the lead screw.

[0018] In some embodiments of this utility model, the second lens assembly further includes several sets of magnetic attracting elements. The array of magnetic attracting elements is attached to the outer periphery of the second lens assembly. The magnetic attracting elements are installed on the inner side of the opposing surfaces of the two second housings. Each of the two opposing ends of the magnetic attracting elements is provided with a magnetic strip that attracts each other.

[0019] In some embodiments of this utility model, an assembly component is also included, which is installed on the other end face opening of the housing. The assembly component is divided into an assembly ring and a positioning plate. The assembly ring is installed on the outside of the end face opening of the housing, and a plurality of positioning plates are provided, which are arranged in a circumferential array on the outer wall of the assembly ring.

[0020] In some embodiments of this utility model, the second lens uses a microlens array as an auxiliary collimation element.

[0021] The beneficial effects of this utility model are as follows: This utility model drives the second lens assembly to move along the guide section trajectory through the drive mechanism, thereby changing the focal length of the lens to achieve zoom function. Compared with the prior art, it optimizes the overall structure of the device and improves the zoom stability of the device. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the zoom lens structure in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the sliding guide mechanism and the driving mechanism in the embodiments of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the second lens assembly in an embodiment of the present invention;

[0026] Figure 4 This is an embodiment of the present utility model. Figure 3 A magnified view of a section at point A in the middle;

[0027] Figure 5 This is a structural schematic diagram of the assembly in an embodiment of this utility model.

[0028] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. First tube body; 12. Second tube body; 2. First lens assembly; 21. Lens No. 1; 22. First shell; 3. Second lens assembly; 31. Lens No. 2; 32. Second shell; 33. Mounting base; 34. Magnetic suction component; 4. Sliding guide mechanism; 41. Guide part; 42. Slide rail; 43. Slider; 5. Drive mechanism; 51. Drive motor; 52. Lead screw; 6. Assembly component; 61. Assembly ring; 62. Positioning plate. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] like Figures 1 to 5 The zoom lens shown includes: a housing 1, a first lens assembly 2, a second lens assembly 3, a sliding guide mechanism 4, and a drive mechanism 5. The housing 1 is hollow internally; the first lens assembly 2 is mounted on one end face of the housing 1; the second lens assembly 3 is coaxially disposed within the housing 1; the sliding guide mechanism 4 includes a guide portion 41 disposed on the inner wall of the housing 1, the guide portion 41 being axially disposed along the housing 1 and slidably disposed relative to the second lens assembly 3; the drive mechanism 5 is disposed within the housing 1, connected to the second lens assembly 3, and used to drive the second lens assembly 3 to move in a direction closer to or farther from the first lens assembly 2. Figures 1 to 3 As shown, the outer casing 1 is a hollow structure used to house components such as the second lens assembly 3 and the sliding guide mechanism 4, and to provide structural support. The first lens assembly 2 is installed on one end face of the outer casing 1. The second lens assembly 3 is coaxially disposed inside the outer casing 1 with the first lens assembly 2 and is movable within the outer casing 1 to achieve zoom functionality. The guide portion 41 in the sliding guide mechanism 4 is arranged along the axial direction of the outer casing 1 and cooperates with the second lens assembly 3 to allow the second lens assembly 3 to slide smoothly along the axial direction. The drive mechanism 5 is disposed inside the outer casing 1 and connected to the second lens assembly 3, driving the second lens assembly 3 to move closer to or away from the first lens assembly 2 to change the lens spacing and achieve zoom.

[0033] In the above embodiments, the present invention drives the second lens assembly 3 to move along the trajectory of the guide part 41 through the drive mechanism 5, thereby changing the focal length of the lens to achieve zoom function. Compared with the prior art, it optimizes the overall structure of the device and improves the zoom stability of the device.

[0034] In an embodiment of this utility model, the outer shell 1 is cylindrical and stepped, and is divided into a first tube 11 and a second tube 12. The outer diameter of the first tube 11 is smaller than the outer diameter of the second tube 12, and the guide portion 41 is disposed on the inner wall of the second tube 12. Figure 1 As shown, the first tube 11 has a smaller outer diameter and is used to mount the first lens assembly 2, providing an optical path. The second tube 12 has a larger outer diameter and is used to accommodate the second lens assembly 3, the sliding guide mechanism 4, and the drive mechanism 5. The guide portion 41 is disposed on the inner wall of the second tube 12. Since the inner diameter of the second tube 12 is larger, it will not affect the optical path inside the first tube 11, while also providing better support and guidance.

[0035] Furthermore, the installation of the first lens assembly 2 is as follows: Figure 1 As shown, the first lens assembly 2 includes a first lens 21 and a first housing 22. The first housing 22 is detachably mounted on the outer end face of the first tube 11, and the first lens 21 is mounted inside the first housing 22. The first lens 21 is an optical element responsible for imaging or light adjustment. The first housing 22 is used to fix and support the first lens 21, and also provides a mounting interface with the outer casing 1. The first lens 21 is mounted inside the first housing 22, and the first housing 22 is mounted on the end face of the first tube 11 of the outer casing 1. This structure facilitates alignment of the optical axis, improves the accuracy of the optical system, and makes the first lens assembly 2 easier to disassemble and maintain. It should be noted that there are various ways to achieve the detachable mounting of the first housing 22, such as a snap-fit ​​type or a plug-in type, etc.

[0036] The specific structure of the second lens assembly 3 is as follows: Figure 3 As shown, in an embodiment of this utility model, the second lens assembly 3 includes a second lens 31 and a second housing 32, with the second housing 32 disposed at both ends of the second lens 31. The second housing 32 is used to support and fix the second lens 31. Two second housings 32 are provided, respectively installed at both ends of the second lens 31. This structure enhances the stability of the second lens assembly 3, preventing it from tilting or loosening during movement, and also provides a more reliable support structure.

[0037] The specific structure of the sliding guide mechanism 4 is as follows: Figure 2 and Figure 3As shown, the sliding guide mechanism 4 also includes a slide rail 42 and a slider 43. The guide portion 41 is configured as a straight groove, the slide rail 42 is disposed within the guide portion 41, and the slider 43 is disposed on the second housing 32, with the slider 43 and slide rail 42 forming a sliding fit. The slide rail 42, installed within the guide portion 41, provides support and guidance, allowing the second lens assembly 3 to slide along a predetermined trajectory. The slider 43, fixed to the second housing 32, cooperates with the slide rail 42 to form a sliding structure, enabling the second lens 31 to move axially. The guide portion 41, configured as a straight groove, ensures that the second lens assembly 3 moves along a fixed direction without rotation or offset. This configuration effectively reduces frictional resistance, allowing the second lens assembly 31 to move more smoothly and precisely, thereby improving the optical performance of the zoom lens. It should be noted that the slider 43 and slide rail 42 can be configured as a grooved slider, a ball bearing slide rail, or a linear guide rail, depending on the required precision. Similarly, the number and location of the guide sections 41 should be arranged reasonably according to the usage requirements or performance requirements.

[0038] To achieve the connection between the drive assembly and the second lens assembly 3, such as Figure 3 As shown, the second lens assembly 3 also includes a mounting base 33. The mounting base 33 is disposed on the two secondary housings 32, avoiding the slider 43. The mounting base 33 is perpendicular to the axial direction of the housing 1, and the two mounting bases 33 are on the same straight line. The plane direction of the mounting base 33 forms a 90° angle with the central axis of the housing 1. The two mounting bases 33 are on the same horizontal plane, which helps to ensure that the lens assembly is subjected to uniform force and avoids tilting or shaking.

[0039] The specific structure of the drive mechanism 5 is as follows: Figure 4As shown, the drive mechanism 5 includes a drive motor 51 and a lead screw 52. A mounting base 33 is movably sleeved on the lead screw 52. The mounting base 33 has a threaded hole at its center that matches the outer circumference of the lead screw 52. The drive motor 51 rotates the lead screw 52, ​​causing the mounting base 33 to move along the lead screw, thereby driving the second lens assembly 3 to move along the direction of the lead screw 52. The drive motor 51 serves as the power source, responsible for driving the rotation of the lead screw 52. The lead screw 52 can be a ball screw to reduce friction and improve transmission efficiency. The mounting base 33 has a threaded hole at its center that matches the outer circumference of the lead screw 52, ​​ensuring thread engagement with the lead screw 52. When the drive motor 51 rotates the lead screw 52, ​​the mounting base 33 moves axially along the lead screw 52. It's important to understand that there are many ways for the drive motor 51 to drive the lead screw 52. A first gear can be installed at the output end of the drive motor 51, and a second gear can be installed at the output end of the lead screw 52 near the drive motor 51. The first and second gears mesh to achieve power transmission. Alternatively, belt drive or electromagnetic induction drive can be used, among other methods. In this configuration, the helical transmission characteristics of the lead screw 52 are utilized to precisely move the mounting base 33 axially, thereby driving the second lens assembly 3 to zoom, improving the stability and adjustment accuracy of the zoom lens.

[0040] To further optimize the structure of the second lens assembly 3, such as Figure 3 As shown, the second lens assembly 3 also includes several sets of magnetic attractors 34. The magnetic attractors 34 are arranged in an array and attached to the outer periphery of the second lens assembly 3. The magnetic attractors 34 are installed on the inner sides of the opposing surfaces of the two secondary housings 32. Each of the two opposing ends of the magnetic attractors 34 has a magnetic strip that attracts each other. The array of magnetic attractors 34 attached to the outer periphery of the second lens assembly 3 and distributed along the circumferential direction of the lens assembly helps to balance the force. The magnetic attractors 34 are located on the opposing inner sides of the secondary housings 32, forming a paired structure. The two ends of each magnetic attractor 34 have magnetic strips that attract each other. These magnetic strips can stabilize the lens assembly, reduce vibration or loosening, and ensure that the lens assembly maintains a precise position during zooming. This structure optimizes the performance of the zoom lens, making the lens assembly more precise and stable during sliding.

[0041] In embodiments of this utility model, an assembly 6 is also included, installed on the other end face opening of the outer casing 1. The assembly 6 is divided into an assembly ring 61 and a positioning plate 62. The assembly ring 61 is installed on the outer side of the end face opening of the outer casing 1, and several positioning plates 62 are provided, arranged in a circumferential array on the outer wall of the assembly ring 61. Figure 1 and Figure 5As shown, assembly 6 is used to fix the lens, facilitating its installation on other devices such as camera bodies and optical instruments. It also provides additional support to ensure the stability of the lens structure. Assembly ring 61 serves a fixing function and is installed on the other end face of housing 1. Locking plate 62 is used for locking and positioning. Locking plate 62 has several circumferentially arranged circles on the outer side of the outer wall of assembly ring 61, which can distribute the force and reduce deformation or damage caused by single-point force. Assembly 6 provides a stable and detachable fixing structure for the lens, ensuring reliable installation and uniform force distribution.

[0042] In this embodiment of the invention, the second lens 31 employs a microlens array as an auxiliary collimating element. A microlens array refers to an array composed of multiple tiny lenses, typically with uniformly distributed lens units, each capable of independently altering the light propagation path. The microlens array can be integrated into a surface of the second lens 31 or installed as a separate optical element within the second lens 31. When light passes through the microlens array, the multiple microlens units individually fine-tune the beam, reducing beam divergence and forming a more uniform and focused collimated beam. This configuration significantly improves the performance of the optical system, making the beam more stable and precise.

[0043] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A zoom lens, characterized in that, The utility model relates to a zoom lens, which comprises: a housing, which is hollow inside; a first lens assembly, which is mounted on one side end face of the housing; a second lens assembly, which is coaxially arranged in the housing; a sliding guide mechanism, which comprises a guide part arranged on the inner wall of the housing, the guide part being arranged along the axial direction of the housing and being relatively slidably arranged with the second lens assembly; a driving mechanism, which is arranged in the housing and connected with the second lens assembly, and is used for driving the second lens assembly to move towards or away from the first lens assembly.

2. The zoom lens according to claim 1, characterized by The housing is in a cylindrical stepped shape, and the housing is divided into a first pipe body and a second pipe body, the outer diameter of the first pipe body being smaller than that of the second pipe body, and the guide part being arranged on the inner wall of the second pipe body.

3. The zoom lens according to claim 2, characterized by The first lens assembly comprises a first lens and a first shell, the first shell being detachably mounted on the outer side end face of the first pipe body, and the first lens being mounted in the inner side of the first shell.

4. The zoom lens according to claim 1, characterized by The second lens assembly comprises a second lens and a second shell, and the second shell is arranged at both ends of the second lens.

5. The zoom lens according to claim 4, characterized by The sliding guide mechanism further comprises a sliding rail and a sliding block, the guide part is in the shape of a straight slot, the sliding rail is arranged in the guide part, and the sliding block is arranged on the second shell and slidably connected with the sliding rail.

6. The zoom lens according to claim 5, characterized by The second lens assembly further comprises a mounting seat, the mounting seat being arranged on the two second shells away from the sliding block, the mounting seat being perpendicular to the axial direction of the housing, and the two mounting seats being on the same straight line.

7. The zoom lens according to claim 6, characterized by The driving mechanism comprises a driving motor and a screw rod, the mounting seat being movably sleeved on the screw rod, a threaded hole being arranged in the center of the mounting seat and being matched with the outer periphery of the screw rod, the driving motor being used for rotating the screw rod, so that the mounting seat moves along the screw rod, and the second lens assembly moves along the direction of the screw rod.

8. The zoom lens according to claim 6, characterized by The second lens assembly further comprises a plurality of groups of magnetic attraction elements, the magnetic attraction elements being arrayed on the outer periphery of the second lens assembly, the magnetic attraction elements being arranged on the inner sides of the opposite faces of the two second shells, and magnetic strips being arranged at the opposite ends of the magnetic attraction elements and being magnetically attracted to each other.

9. The zoom lens according to claim 1, characterized by The utility model further comprises an assembling part, which is mounted on the other side end face of the housing, the assembling part being divided into an assembling ring and a clamping plate, the assembling ring being mounted on the outer side of the end face of the housing, and the clamping plate being provided with a plurality of clamping plates, which are arrayed on the outer wall of the assembling ring.

10. The zoom lens according to claim 4, characterized by The second lens adopts a microlens array as an auxiliary collimating element.

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