Focusing mechanism and handheld device

Abstract

The embodiment of the invention provides a focusing mechanism and handheld equipment, in the focusing mechanism, a first focusing knob fixedly sleeves a focusing shaft, a first end of a first transmission mechanism is in transmission connection with the first focusing knob, and a second end of the first transmission mechanism is connected with a first lens or a first movement in a first lens assembly; the second focusing knob is rotatably sleeved on the focusing shaft, the first end of the second transmission mechanism is in transmission connection with the second focusing knob, and the second end of the second transmission mechanism is connected with a second lens or a second movement in the second lens assembly. The first focusing knob is rotated to adjust the position of the first lens or the first movement through the first transmission mechanism, so that the first lens assembly is clearly imaged; and the second focusing knob is rotated to adjust the position of the second lens or the second movement through the second transmission mechanism, so that the second lens assembly is clearly imaged, the focusing mode is relatively simple, the two lens assemblies are clearly imaged, and the imaging effect of the handheld equipment is improved.

Description

Technical Field

[0001] The present application relates to the technical field of optical imaging equipment, and in particular to a focusing mechanism and a handheld device. Background Art

[0002] Existing handheld devices typically include two lens assemblies and a focusing wheel, which is used to adjust the focus lenses within both lens assemblies. During focusing, rotating the focusing wheel causes the focus lenses within both lens assemblies to move simultaneously along their optical axes, ensuring that both lenses always move the same distance.

[0003] If the two lens assemblies are of the same type and have the same focusing parameters, rotating a single focusing wheel can simultaneously adjust the focus of both lens assemblies, adjusting both focusing lenses to the appropriate position for clear imaging from both sets of lenses. However, if the two lens assemblies are of different types or have different focusing parameters, for example, one set is a visible light lens assembly and the other is an infrared lens assembly, rotating a single focusing wheel can only adjust one set of lenses to the appropriate position, resulting in clear imaging from one set of lenses while the other set of lenses cannot. If you want the other set of lenses to have a clear image, you need to rotate the focusing wheel again to adjust the focus for that set of lenses. This means that only one set of lenses can be clearly imaged at a time, resulting in poor imaging quality. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a focusing mechanism and a handheld device that can individually adjust the position of each lens or movement to achieve clear imaging of both lens assemblies, thereby improving the imaging effect of the handheld device. The specific technical solution is as follows:

[0005] The embodiment of the present application provides a focusing mechanism, which is arranged between two lens assemblies of a handheld device; each lens assembly has a lens and a movement arranged in sequence along the incident direction of light; the focusing mechanism includes: a focusing shaft, which is arranged in a direction parallel to the optical axis of the lens assembly; a first focusing knob, which is fixedly mounted on the focusing shaft and can rotate around the axial direction of the focusing shaft; a first transmission mechanism, whose first end is transmission-connected to the first focusing knob and whose second end is connected to the first lens or the first movement in the first lens assembly; a second focusing knob, which is rotationally mounted on the focusing shaft and is rotationally connected to the first focusing knob The buttons are adjacent and can be rotated around the axial direction of the focusing shaft; a second transmission mechanism, a first end of which is located in the second accommodating cavity between the second focusing knob and the focusing shaft, and extends to the first accommodating cavity in the first focusing knob; the first end of the second transmission mechanism is transmission-connected to the second focusing knob, and the second end is connected to the second lens or the second movement in the second lens assembly; the first focusing knob is rotated to adjust the position of the first lens or the first movement through the first transmission mechanism; the second focusing knob is rotated to adjust the position of the second lens or the second movement through the second transmission mechanism.

[0006] In some embodiments of the present application, the first transmission mechanism includes: a first moving member and a first connecting rod; the first moving member is sleeved on the focusing shaft and is connected to the first focusing knob through the focusing shaft; one of the first moving member and the focusing shaft is provided with a curved slide groove extending along the axial direction, and the other is provided with a protrusion movably mounted on the curved slide groove; or, the first moving member is threadedly connected to the focusing shaft; the first moving member converts the rotation of the focusing shaft into its own axial movement by cooperating with the curved slide groove and the protrusion, or by threaded connection; the first connecting rod is provided on one side of the focusing shaft; one end of the first connecting rod is fixedly connected to the first moving member, and the other end is fixedly connected to the first lens or the first movement; when the first focusing knob is rotated, the focusing shaft rotates and drives the first moving member to move axially, and drives the first lens or the first movement to move axially through the first connecting rod.

[0007] In some embodiments of the present application, the second transmission mechanism includes: a movable part and a curved cylinder; the movable part is sleeved on the focusing shaft and can move axially in the second adjustment space composed of the first accommodating cavity and the second accommodating cavity; the curved cylinder is sleeved between the movable part and the second focusing knob, is fixedly connected to the second focusing knob, and can rotate around the axial direction of the focusing shaft; a curved slide groove is provided on the cylinder wall of the curved cylinder, the first end of the movable part is slidably connected to the curved slide groove, and the second end is connected to the second lens or the second movement; when the curved cylinder rotates, it can convert its own rotation into axial movement of the movable part through the curved slide groove, so that the movable part drives the second lens or the second movement to move axially.

[0008] In some embodiments of the present application, the focusing shaft is a stepped shaft, including a first shaft segment and a second shaft segment; the first shaft segment is located at the end of the second shaft segment away from the lens and the movement, and has a diameter larger than the second shaft segment; the second transmission mechanism is sleeved on the second shaft segment and extends to the first shaft segment, and is sleeved with the first shaft segment to separate the second accommodating cavity into a first adjustment space located between the second transmission mechanism and the second shaft segment; the first movable member is sleeved on the second shaft segment and can move axially in the first adjustment space under the drive of the focusing shaft.

[0009] In some embodiments of the present application, a limit plate is rotatably provided on the focusing shaft; the limit plate is located at one end of the focusing shaft close to the lens and the movement; the first transmission mechanism is connected to the first lens or the first movement through the limit plate, and the second transmission mechanism is connected to the second lens or the second movement through the limit plate; the limit plate is fixedly connected to the housing of the lens assembly, and can limit the axial rotation of the first transmission mechanism and the second transmission mechanism around the focusing shaft.

[0010] In some embodiments of the present application, the first focusing knob, the second focusing knob and the limit plate are sequentially attached to each other along the axial direction of the focusing shaft; the first end of the focusing shaft is located inside the first focusing knob, and the second end extends to the inside of the limit plate.

[0011] In some embodiments of the present application, a base is provided between the movable part and the focusing shaft; the base is rotatably connected to the focusing shaft; the end of the base is fixedly connected to the housing of the lens assembly; a limiting waist hole parallel to the focusing shaft is provided on the outer wall of the base; the third end of the movable part is slidably connected to the limiting waist hole, so that the movable part can move along the axial direction of the focusing shaft when the curved cylinder rotates.

[0012] In some embodiments of the present application, the movable part includes: a movable bracket, a guide column and a second connecting rod; the movable bracket is arranged between the base and the curved cylinder, and is connected to the second lens or the second movement through the second connecting rod; a through hole is provided on the movable bracket; the guide column is arranged in the through hole, and the first end of the guide column is movably inserted in the curved slide groove, and the second end is movably inserted in the limiting waist hole; when the curved cylinder rotates, the first end of the guide column moves along the curved slide groove, and the second end moves along the limiting waist hole, so as to drive the movable bracket and the second connecting rod, as well as the second lens or the second movement to move axially.

[0013] In some embodiments of the present application, the outside of the first focusing knob has a plurality of first protrusions distributed at intervals along the circumferential direction; the outside of the second focusing knob has a second protrusion.

[0014] An embodiment of the present application further provides a handheld device, comprising the focusing mechanism described in any of the above embodiments and two lens assemblies; the lens types of the two lens assemblies are different.

[0015] Beneficial effects of the embodiments of the present application:

[0016] The focusing mechanism and handheld device provided in the embodiments of the present application are configured to rotate the first focusing knob to adjust the position of the first lens or the first movement through the first transmission mechanism, so that the first lens assembly can form a clear image; and rotate the second focusing knob to adjust the position of the second lens or the second movement through the second transmission mechanism, so that the second lens assembly can form a clear image. This not only makes the focusing method simpler, but also allows both groups of lens assemblies to form clear images, thereby improving the imaging effect of the handheld device.

[0017] In the focusing mechanism provided in the embodiments of the present application, since the first and second focusing knobs are both mounted on the focusing shaft and positioned adjacent to each other on the focusing shaft, the focusing mechanism has a compact structure, enabling single-handed focusing without requiring movement, facilitating user focusing operations. A first accommodating cavity is provided within the first focusing knob, and the first end of the second transmission mechanism is capable of moving within the first and second accommodating cavities, eliminating the need for additional axial space on the focusing shaft. This improves axial space utilization, allows the focusing shaft to be shortened, and makes the focusing mechanism more compact in the axial direction.

[0018] Of course, it is not necessary to achieve all the advantages described above at the same time when implementing any product or method of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0020] Figure 1 A three-dimensional view of a handheld device provided in an embodiment of the present application from a first angle;

[0021] Figure 2 A perspective view of a handheld device from a second angle provided by an embodiment of the present application;

[0022] Figure 3 for Figure 1 a cutaway view of the handheld device shown;

[0023] Figure 4 for Figure 1 an exploded schematic diagram of the handheld device shown;

[0024] Figure 5 for Figure 1 A perspective view of the focusing mechanism (limiting plate not shown);

[0025] Figure 6 for Figure 5 A three-dimensional diagram of the focusing mechanism without the first and second focusing knobs;

[0026] Figure 7 for Figure 5 An exploded schematic diagram of the focusing mechanism shown;

[0027] Figure 8 for Figure 3 Magnified view of area A shown;

[0028] Figure 9 for Figure 6 An exploded schematic diagram of the second focusing mechanism (the second connecting rod is not shown) is shown.

[0029] Reference numerals:

[0030] Focusing mechanism 10;

[0031] Focusing shaft 100; first shaft shoulder 101; second shaft shoulder 102; first shaft section 110; second shaft section 120; lubricating gasket 130;

[0032] First focusing knob 200; first accommodating cavity 210; first protrusion 220;

[0033] First transmission mechanism 300; first moving member 310; first connecting rod 320;

[0034] Second focusing knob 400; second accommodating cavity 410; first adjustment space 411; second protrusion 420; limiting groove 430;

[0035] Second transmission mechanism 500; movable member 510; movable bracket 511; through hole 5111; guide column 512; second connecting rod 513; curved cylinder 520; curved slide 521; limiting protrusion 522; base 530; limiting waist hole 531; base connecting plate 532; through area 5321; bearing 540; bearing pressure ring 550;

[0036] Limiting plate 600; first through hole 610; second through hole 620; positioning hole 630;

[0037] Lens assembly 20; objective lens assembly 201; lens 2011; movement 2012; end lens 2013; eyepiece assembly 202; housing 203; front housing 203a; middle housing 203b; rear housing 203c; connecting plate 2031;

[0038] First lens assembly 20A; first lens 2011A; first movement 2012A;

[0039] Second lens assembly 20B; second lens 2011B; second movement 2012B;

[0040] Fill light 30; laser ranging sensor 40. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field based on this application are within the scope of protection of this application.

[0042] As mentioned in the background, existing handheld devices typically include two lens assemblies and a focus wheel. This wheel is used to adjust the focus lenses within both lens assemblies. During focusing, rotating the focus wheel causes the focus lenses within both lens assemblies to move simultaneously along their optical axes, ensuring that both lenses always move the same distance.

[0043] If the two lens assemblies are of the same type and have the same focusing parameters, rotating a single focusing wheel can simultaneously adjust the focus of both lens assemblies, adjusting both focusing lenses to the appropriate position for clear imaging from both sets of lenses. However, if the two lens assemblies are of different types or have different focusing parameters, for example, one set is a visible light lens assembly and the other is an infrared lens assembly, rotating a single focusing wheel can only adjust one set of lenses to the appropriate position, resulting in clear imaging from one set of lenses while the other set of lenses cannot. If you want the other set of lenses to have a clear image, you need to rotate the focusing wheel again to adjust the focus for that set of lenses. This means that only one set of lenses can be clearly imaged at a time, resulting in poor imaging quality.

[0044] In order to improve the imaging effect of a handheld device, the present invention provides a focusing mechanism and a handheld device. The focusing mechanism 10 can adjust the position of each lens 2011 or the movement 2012 individually to achieve clear imaging of both lens assemblies 20. The focusing mechanism 10 will be described in detail below.

[0045] See also Figures 1 to 5 , Figure 1 A three-dimensional view of a handheld device provided in an embodiment of the present application from a first angle; Figure 2 A perspective view of a handheld device from a second angle provided by an embodiment of the present application; Figure 3 for Figure 1 a cutaway view of the handheld device shown; Figure 4 for Figure 1 an exploded schematic diagram of the handheld device shown; Figure 5 for Figure 1The three-dimensional diagram of the focusing mechanism (not shown) is shown. Figures 1 to 5 As shown, a focusing mechanism 10 is disposed between two lens assemblies 20 of a handheld device. Each lens assembly 20 comprises a lens 2011 and a movement 2012, arranged sequentially along the direction of incident light. The focusing mechanism 10 includes a focusing shaft 100, a first focusing knob 200, a first transmission mechanism 300, a second focusing knob 400, and a second transmission mechanism 500.

[0046] The focus axis 100 is arranged parallel to the optical axis of the lens assembly 20. The first focus knob 200 is fixedly mounted on the focus axis 100 and can rotate about the axial direction of the focus axis 100. The first end of the first transmission mechanism 300 is in transmission connection with the first focus knob 200, and the second end is connected to the first lens 2011A or the first movement 2012A in the first lens assembly 20A.

[0047] The second focusing knob 400 is rotatably mounted on the focusing shaft 100, adjacent to the first focusing knob 200, and is rotatable about the axial direction of the focusing shaft 100. The first end of the second transmission mechanism 500 is located in the second accommodating cavity 410 between the second focusing knob 400 and the focusing shaft 100, and extends into the first accommodating cavity 210 within the first focusing knob 200. The first end of the second transmission mechanism 500 is in driving connection with the second focusing knob 400, and the second end is connected to the second lens 2011B or the second movement 2012B in the second lens assembly 20B.

[0048] The first focusing knob 200 is rotated to adjust the position of the first lens 2011A or the first movement 2012A through the first transmission mechanism 300 to adjust the distance between the first lens 2011A and the first movement 2012A to achieve focal length adjustment so that the first lens assembly 20A can form a clear image.

[0049] The second focusing knob 400 is rotated to adjust the position of the second lens 2011B or the second movement 2012B through the second transmission mechanism 500 to adjust the distance between the second lens 2011B and the second movement 2012B to achieve focal length adjustment so that the second lens assembly 20B can form a clear image.

[0050] The focusing mechanism 10 provided in the embodiment of the present application can make the first lens assembly 20A clearly imaged by rotating the first focusing knob 200, and can make the second lens assembly 20B clearly imaged by rotating the second focusing knob 400. This not only makes the focusing method simpler, but also makes both lens assemblies 20 clearly imaged, thereby improving the imaging effect of the handheld device.

[0051] In the focusing mechanism 10 provided in the embodiment of the present application, since the first focusing knob 200 and the second focusing knob 400 are both mounted on the focusing shaft 100 and are adjacently arranged on the focusing shaft 100, the focusing mechanism 10 has a compact structure, and can achieve focusing with one hand without moving the position, which is convenient for the user to perform focusing operations.

[0052] Because the second transmission mechanism 500 requires a certain amount of space to move in order to drive the second lens 2011B or the second movement 2012B, if the first focusing knob 200 is a closed knob, the focusing shaft 100 needs to be longer to leave sufficient axial space for the second transmission mechanism 500 to move, resulting in a loose structure of the focusing mechanism 10 and occupying a large axial installation space. In contrast, in the focusing mechanism 10 provided in the embodiment of the present application, a first accommodating cavity 210 is provided within the first focusing knob 200, and the first end of the second transmission mechanism 500 can move within the first accommodating cavity 210 and the second accommodating cavity 410. In other words, the first end of the second transmission mechanism 500 does not need to occupy additional axial space of the focusing shaft 100, thereby improving the utilization of the axial space and allowing the focusing shaft 100 to be shorter, making the focusing mechanism 10 more compact in the axial direction.

[0053] Specifically, in Figure 5 In the embodiment shown, the first transmission mechanism 300 is connected to the first lens 2011A, and the second transmission mechanism 500 is connected to the second lens 2011B. By adjusting the position of the lens 2011, the focal length can be adjusted.

[0054] In other embodiments of the present application, the first transmission mechanism 300 may be connected to the first movement 2012A, and the second transmission mechanism 500 may be connected to the second movement 2012B. By adjusting the position of the movement 2012, the focal length can be adjusted.

[0055] The focal length adjustment mentioned above refers to adjusting the position of the lens 2011 or the movement 2012 to adjust the distance between the lens 2011 and the movement 2012 to change the focal plane position of the imaging so that the observed object can be clearly imaged in the field of view of the handheld device 1.

[0056] The first focusing knob 200 and the second focusing knob 400 are adjacent to each other. Figures 1 to 3 As shown, the first focusing knob 200 and the second focusing knob 400 are arranged in close proximity along the axial direction of the focusing axis 100, and the two are coaxial and can rotate relatively independently around the axial direction of the focusing axis 100 without interfering with each other. This application does not limit the relative position relationship between the first focusing knob 200 and the second focusing knob 400. The second focusing knob 400 can be located on the side of the first focusing knob 200 away from the lens 2011, or can be located on the side of the first focusing knob 200 away from the lens 2011, as shown in FIG. Figures 1 to 3As shown, it is located on the side of the first focusing knob 200 close to the lens 2011. The following description of the present application takes the case where the second focusing knob 400 is located on the side of the first focusing knob 200 close to the lens 2011 as an example.

[0057] The outer contours of the first focusing knob 200 and the second focusing knob 400 may be the same or different. Figure 3 In the illustrated embodiment, the exterior of the first focusing knob 200 is provided with a plurality of first protrusions 220 spaced circumferentially. The exterior of the second focusing knob 400 is provided with a single second protrusion 420. The different number and shapes of the two protrusions facilitate the user's ability to distinguish and memorize the lens assembly 20 corresponding to each focusing knob, enabling faster and more accurate rotation of the focusing knob corresponding to the lens assembly 20 to be focused. Furthermore, the two protrusions also provide a slip-resistant feature. In other embodiments of the present application, the outer contours of the first focusing knob 200 and the second focusing knob 400 may be swapped, or two other different outer contours may be employed.

[0058] The lens 2011 can be a single lens or a group of lenses, which is not limited in this application. In addition to the lens 2011, the lens assembly 20 can also include other lenses, such as Figure 5 The end lens 2013 is shown in FIG. The end lens 2013 is located on the side of the lens 2011 close to the observed object and is coaxial with the lens 2011. The end lens 2013 can be a fixed lens or a movable lens, which is not limited in this application.

[0059] Next, the focusing principle of the first lens assembly 20A is described.

[0060] In some embodiments of the present application, Figures 3 to 5 As shown, the first transmission mechanism 300 includes a first moving member 310 and a first connecting rod 320 .

[0061] The first moving member 310 is sleeved on the focusing shaft 100 and is transmission-connected to the first focusing knob 200 via the focusing shaft 100 .

[0062] One of the first moving member 310 and the focusing shaft 100 is provided with a curved sliding groove extending in the axial direction, and the other is provided with a protrusion movably mounted on the curved sliding groove. Figure 3 The first moving member 310 is threadedly connected to the focusing shaft 100. The first moving member 310 converts the rotation of the focusing shaft 100 into its own axial movement through the cooperation of a curved slot and a protrusion, or a threaded connection.

[0063] like Figure 5As shown, the first connecting rod 320 is disposed on one side of the focusing shaft 100. One end of the first connecting rod 320 is fixedly connected to the first moving member 310, and the other end is fixedly connected to the first lens 2011A or the first movement 2012A. This can not only realize the transmission between the first moving member 310 and the lens 2011 or the movement 2012, but also limit the first moving member 310 from rotating along with the focusing shaft 100. There is no need to set an additional limit mechanism to limit the rotation of the first moving member 310, making the structure of the first transmission mechanism 300 simple.

[0064] When the first focusing knob 200 is rotated, the focusing shaft 100 rotates and drives the first moving member 310 to move axially, and drives the first lens 2011A or the first movement 2012A to move axially through the first connecting rod 320 .

[0065] In the embodiment of the present application, the first transmission mechanism 300 is also sleeved on the focusing shaft 100 through the first movable member 310, that is, the first focusing knob 200, the first transmission mechanism 300, the second focusing knob 400 and the second transmission mechanism 500 are all sleeved on the focusing shaft 100 and are coaxially arranged. This can simplify the installation and maintenance process of the focusing mechanism 10, and can also avoid vibration and offset of the various components when the focusing shaft 100 rotates, so that the structure of the focusing mechanism 10 is stable. The above-mentioned components are stable in rotating around the axial direction of the focusing shaft 100 or moving along the axis, thereby ensuring focusing accuracy and stability during focusing.

[0066] In the embodiment of the present application, the first moving member 310 converts the rotation of the focusing shaft 100 into its own axial movement through one of the two connection methods mentioned above, so that the number of parts of the first transmission mechanism 300 is small, the structure is simple, and it is easy to process and assemble. Figure 3 The embodiment shown adopts a threaded connection method, which makes the installation of the first movable member 310 easier and the connection more stable, and can avoid relative shaking when the focusing shaft 100 and the first movable member 310 are transmitted, thereby improving the transmission stability of the first transmission mechanism 300, thereby ensuring the focusing accuracy and stability during focusing.

[0067] The embodiment of the present application realizes torque transmission between the first focusing knob 200 and the first movable member 310 through the focusing shaft 100. Compared with transmitting torque through multiple components, it can reduce power loss and improve the transmission efficiency between the first focusing knob 200 and the first movable member 310; the first focusing knob 200 and the first movable member 310 can realize torque transmission without direct contact, making the layout position of the first movable member 310 more flexible.

[0068] The specific arrangement position of the first moving member 310 is not limited in this application, and can be located outside the focusing knob, occupying the axial length space of the focusing shaft 100 alone, or as shown in FIG. Figure 3 The image is located inside the focusing knob and shares the axial length space of the focusing axis 100 with the focusing knob. Please refer to the subsequent description for details.

[0069] Next, the focusing principle of the second lens assembly 20B is described.

[0070] In some embodiments of this application, see Figures 6 to 9 , Figure 6 for Figure 5 A three-dimensional diagram of the focusing mechanism without the first and second focusing knobs; Figure 7 for Figure 5 An exploded schematic diagram of the focusing mechanism shown; Figure 8 for Figure 3 Magnified view of area A shown; Figure 9 for Figure 6 The exploded schematic diagram of the second focusing mechanism (the second connecting rod is not shown) is shown. Figures 6 to 9 As shown, the second transmission mechanism 500 includes a movable member 510 and a curved cylinder 520 .

[0071] like Figure 8 As shown, the movable member 510 is mounted on the focusing shaft 100 and is axially movable within the second adjustment space formed by the first accommodating cavity 210 and the second accommodating cavity 410. The curved cylinder 520 is mounted between the movable member 510 and the second focusing knob 400, is fixedly connected to the second focusing knob 400, and is rotatable about the axial direction of the focusing shaft 100.

[0072] The curved tube 520 has a curved slot 521 formed on its wall. The curved slot 521 is a through slot that penetrates the wall. The first end of the movable member 510 is slidably connected to the curved slot 521, and the second end is connected to the second lens 2011B or the second movement 2012B.

[0073] When the curved barrel 520 rotates, it can convert its own rotation into axial movement of the movable member 510 through the curved sliding groove 521, so that the movable member 510 drives the second lens 2011B or the second movement 2012B to move axially.

[0074] In this embodiment of the present application, the conversion of rotation into axial movement is achieved through the transmission of the movable member 510 and the curved cylinder 520, resulting in a simple structure for the second transmission mechanism 500, making it easier to manufacture and assemble. The nested arrangement of the movable member 510 and the curved cylinder 520 shortens the axial length of the first end of the second transmission mechanism 500, making the first end of the second transmission mechanism 500 more compact in the axial direction.

[0075] In addition, the movable part 510 moves in the second adjustment space formed by the first accommodating cavity 210 and the second accommodating cavity 410, thereby improving space utilization and eliminating the need to occupy the area on the focusing axis that is not covered by the focusing knob, so that the end surface of the second focusing knob 400 on the side close to the lens 2011 is flat, the axial length of the focusing axis 100 can be set shorter, and the structure of the focusing mechanism 10 is more compact.

[0076] Specifically, the fixed connection between the curved cylinder 520 and the second focusing knob 400 can be a snap connection, and its specific implementation method is as follows: Figure 5 and Figure 9 As shown, at least one limiting groove 430 is formed on the end surface of the second focusing knob 400, with the opening of the limiting groove 430 facing the interior of the second focusing knob 400. The curved cylinder 520 is provided with an equal number of limiting protrusions 522 on the corresponding end surface. The limiting protrusions 522 are inserted into the limiting grooves 430 along the axial direction, so that the curved cylinder 520 and the second focusing knob 400 are engaged, thereby achieving synchronous rotation of the curved cylinder 520 and the second focusing knob 400.

[0077] In some embodiments of the present application, Figure 3 、 Figure 4 、 Figure 8 and Figure 9 As shown, a base 530 is sleeved between the movable member 510 and the focusing shaft 100. The base 530 is rotatably connected to the focusing shaft 100. The end of the base 530 is fixedly connected to the housing 203 of the lens assembly 20.

[0078] The outer wall of the base 530 is provided with a limiting waist hole 531 parallel to the focusing axis 100. The third end of the movable member 510 is slidably connected to the limiting waist hole 531 so that the movable member 510 can move along the axial direction of the focusing axis 100 when the curved cylinder 520 rotates.

[0079] By using the embodiment of the present application, a base 530 is provided, and a limiting waist hole 531 is formed on the base 530 to limit the rotation of the movable part 510, thereby converting the rotation of the curved cylinder 520 into axial movement of the movable part 510. By slotting the base 530 and the curved cylinder 520 and cooperating with the movable part 510, the second transmission mechanism 500 has a simple structure and is easy to process and disassemble. The base 530, the movable part 510, the curved cylinder 520, and the second focusing knob 400 are nested layer by layer, making the second transmission mechanism 500 and the second focusing knob 400 compactly assembled, the axial length of the focusing shaft 100 can be set shorter, and the structure of the focusing mechanism 10 is more compact.

[0080] The fixed connection between the end of the base 530 and the housing 203 of the lens assembly 20 can be a direct fixed connection or a fixed connection as shown in FIG. Figures 2 to 4As shown, it is an indirect fixed connection, and the two are fixedly connected through a limiting plate 600. Please refer to the subsequent description for details.

[0081] The specific implementation method of the above-mentioned base 530 and the focusing shaft 100 is as follows: Figure 7 and Figure 8 As shown, a bearing 540 is sleeved between the base 530 and the focusing shaft 100. The inner ring of the bearing 540 is tightly fitted with the focusing shaft 100, and the outer ring is tightly fitted with the base 530 to achieve a rotational connection, thereby preventing the rotation of the focusing shaft 100 from being restricted by the base 530 when the first focusing knob 200 is rotated.

[0082] The number of bearings 540 is not limited in this application, and can be adjusted according to the axial dimensions of the focusing shaft 100 and the base 530. Figure 8 In the embodiment shown, the number of bearings 540 is 1, and the focusing shaft 100 has a raised first shoulder 101; the end surface of the connection end of the first focusing knob 200 and the focusing shaft 100 presses the bearing 540 against the first shoulder 101, thereby achieving axial positioning of the bearing 540. Figure 8 As shown in , if the diameter of the end surface of the connection end between the first focusing knob 200 and the focusing shaft 100 is smaller than the diameter of the bearing 540 , a bearing pressing ring 550 may be sleeved on the connection end to press the entire bearing 540 .

[0083] like Figure 8 and Figure 9 As shown, the end of the base 530 away from the first focusing knob 200 protrudes outward in the radial direction to form a circle of base connecting plates 532, which are used to be directly or fixedly connected to the connecting plate 2031 of the housing 203, and are also used to cooperate with the second focusing knob 400 to clamp the curved cylinder 520 to prevent the curved cylinder 520 from axial movement.

[0084] In some embodiments of the present application, Figure 8 and Figure 9 As shown, the movable member 510 includes a movable bracket 511 , a guide post 512 and a second connecting rod 513 .

[0085] The movable bracket 511 is mounted between the base 530 and the curved tube 520 and is connected to the second lens 2011B or the second movement 2012B via a second connecting rod 513. A through hole 5111 is provided on the movable bracket 511. A guide post 512 is disposed within the through hole 5111. The first end of the guide post 512 is movably engaged with the curved slide groove 521, and the second end is movably engaged with the retaining hole 531.

[0086] When the curved tube 520 rotates, the first end of the guide column 512 moves along the curved slide groove 521, and the second end moves along the limiting waist hole 531, so as to drive the movable bracket 511 and the second connecting rod 513, as well as the second lens 2011B or the second movement 2012B to move axially.

[0087] In the embodiment of the present application, the movable part 510 includes a movable bracket 511, a guide column 512 and a second connecting rod 513. During installation, the movable bracket 511 can be first connected to the base 530 and the curved tube 520, and then the guide column 512 can be inserted and the second connecting rod 513 can be fixed, so that the movable part 510 has a simple structure and is easy to process and assemble.

[0088] Specifically, the number of guide posts 512 corresponds to the number of through holes 5111, curved slots 521 and limiting waist holes 531, which can be 1 or more. Figure 9 Multiple ones are shown to improve the stability of the internal transmission of the second transmission mechanism 500. Figure 9 In the embodiment shown, the number of through holes 5111, limiting waist holes 531 and curved slide grooves 521 is 3, and they are evenly distributed along the circumference and correspond one to one, so that each guide column 512 can pass through the curved slide groove 521, the through hole 5111 and the limiting waist hole 531 in sequence.

[0089] like Figure 9 As shown, the area on the movable bracket 511 without the through hole 5111 has a thickness in the axial direction that is smaller than the thickness of the area with the through hole 5111 , so as to reduce the weight of the movable bracket 511 and thus reduce the overall weight of the focusing mechanism 10 .

[0090] like Figure 8 and Figure 9 As shown, a through area 5321 is provided on the base connecting plate 532 , so that the second connecting rod 513 can pass through the base 530 and be fixedly connected to the movable bracket 511 .

[0091] Next, the specific arrangement position of the first moving member 310 will be described.

[0092] Because the base 530 of the second transmission mechanism 500 is rotatably connected to the focus shaft 100 via the bearing 540, a clearance exists between the base 530 and the focus shaft 100. The first movable member 310 can be movably disposed within this clearance, thereby preventing the first movable member 310 from occupying the entire axial length of the focus shaft 100. This allows the focus shaft 100 to be shortened, resulting in a more compact structure for the focus mechanism 10.

[0093] Furthermore, in order to enlarge the radial dimension of the gap between the base 530 and the focusing shaft 100 without increasing the radial dimension of the focusing mechanism 10, so that the first moving member 310 has a looser movement space, as shown in FIG. Figure 8 As shown, the focusing shaft 100 is a stepped shaft, comprising a first shaft section 110 and a second shaft section 120. The first shaft section 110 is located at the end of the second shaft section 120 away from the lens 2011 and the movement 2012, and has a larger diameter than the second shaft section 120. In other words, the second shaft section 120 serves as the moving range of the first moving member 310, and its diameter is made smaller to increase the radial size of the movable space of the first moving member 310.

[0094] The first focusing knob 200 is fixed to the end of the first shaft section 110 away from the lens 2011 ; the second focusing knob is attached to the first focusing knob 200 and sleeved on the second shaft section 120 .

[0095] The second transmission mechanism 500 is sleeved on the second shaft segment 120 and extends to the first shaft segment 110, and is sleeved with the first shaft segment 110 to separate the second accommodating cavity 410 into a first adjustment space 411 located between the second transmission mechanism 500 and the second shaft segment 120, that is, the activity space of the above-mentioned first moving member 310.

[0096] The second shaft section 120 is provided with a thread, and the first moving member 310 is sleeved on the second shaft section 120 and can move axially in the first adjustment space 411 driven by the focusing shaft 100 .

[0097] The components are installed according to the above-mentioned positional relationship. In the embodiment of the present application, the first adjustment space 411 for the movement of the first movable member 310 and the second adjustment space (composed of the first accommodating chamber 210 and the second accommodating chamber 410) for the movement of the movable bracket 511 are compared with the two adjustment spaces being arranged in sequence along the axial direction on the focusing shaft 100. The two adjustment spaces in the embodiment of the present application are nested with each other and share the axial space of the focusing shaft 100, thereby improving space utilization, allowing the focusing shaft 100 to be set shorter, and making the structure of the focusing mechanism 10 more compact.

[0098] Compared to increasing the radial size of the first adjustment space 411 by increasing the diameter of the bearing 540 and the inner diameter of the base 530 or by increasing the diameter of the first shaft segment 110, the embodiment of the present application adopts the method of reducing the diameter of the second shaft segment 120, which can avoid increasing the radial size of the focusing mechanism 10 and make the structure of the focusing mechanism 10 more compact.

[0099] The first transmission mechanism 300 is fixedly connected to the first lens 2011A or the first movement 2012A through the first connecting rod 320 to achieve rotation limitation of the first movable member 310 along the circumferential direction of the focusing axis 100. The second transmission mechanism 500 is fixedly connected to the second lens 2011B or the second movement 2012B through the second connecting rod 513 to achieve rotation limitation of the movable bracket 511 along the circumferential direction of the focusing axis 100.

[0100] According to the above configuration, the rotation is limited only by the connecting rod. When the focus knob is turned, one end of the connecting rod tends to rotate, while the other end remains stationary under the restriction of the lens 2011. This easily causes the connecting rod to shake, affecting the focusing accuracy and shortening the life of the connecting rod. To solve this problem, Figure 2 、 Figure 4 and Figure 8 As shown, a limit plate 600 is rotatably sleeved on the focus shaft 100. The limit plate 600 is located at one end of the focus shaft 100 close to the lens 2011 and the movement 2012.

[0101] The first transmission mechanism 300 is connected to the first lens 2011A or the first movement 2012A through the limiting plate 600, and the second transmission mechanism 500 is connected to the second lens 2011B or the second movement 2012B through the limiting plate 600.

[0102] The limiting plate 600 is fixedly connected to the housing 203 of the lens assembly 20 , and can limit the axial rotation of the first transmission mechanism 300 and the second transmission mechanism 500 around the focusing axis 100 .

[0103] Specifically, the structure of the limiting plate 600 is as follows: Figure 2 and Figure 4 As shown, the housings 203 of the first lens assembly 20A and the second lens assembly 20B are fixedly connected via a connecting plate 2031 , and the limiting plate 600 is fixed on the connecting plate 2031 . The limiting plate 600 can be integrally formed with the connecting plate 2031 or manufactured separately and fastened together.

[0104] The base 530 is fixedly connected to the limiting plate 600 via the base connecting plate 532 , thereby being fixedly connected to the connecting plate 2031 , so that the base 530 remains stationary when the first focusing knob 200 or the second focusing knob 400 is rotated.

[0105] The limiting plate 600 is provided with a first through-hole 610, a second through-hole 620, and a positioning hole 630. The first through-hole 610 is used to pass through the first connecting rod 320 of the first transmission mechanism 300 and restrict its rotation; the second through-hole 620 is used to pass through the second connecting rod 513 of the second transmission mechanism 500 and restrict its rotation. A gap is formed between the first through-hole 610 and the second through-hole 620 to separate the first connecting rod 320 and the second connecting rod 513 and prevent interference between them. The positioning hole 630 is a blind hole for inserting the end of the focus shaft 100 closest to the lens 2011 to support the focus shaft 100.

[0106] In the embodiment of the present application, a limit member 600 is fixedly provided on the housing 203. The limit member 600 is used to limit the rotation of the first movable member 310 and the movable bracket 511, which can prevent the connecting rod from shaking when the focusing knob is turned, thereby ensuring the focusing accuracy and extending the life of the connecting rod. A through hole is provided on the limit plate 600 for the connecting rod to pass through. In addition to serving as a rotation limit, it can also guide the connecting rod so that the first connecting rod 320 and the second connecting rod 513 always move axially, thereby ensuring the focusing accuracy. In addition, the base 530 is fixedly connected to the limit plate 600 through the base connecting plate 532, so that the base 530 and the limit plate 600 have a larger contact area, preventing the movable member 510 from rotating due to the loosening of the base 530, thereby ensuring a higher focusing accuracy.

[0107] The specific structures of the first connecting rod 320 and the second connecting rod 513 are as follows: Figure 2 and Figure 5 As shown, after vertically passing through the base 530 and the limit plate 600, the first connecting rod 320 and the second connecting rod 513 both have an axial extension section and a radial extension section. The axial extension section allows the two connecting rods to extend to the lens 2011 or the movement 2012, and the radial extension section allows a suitable distance to be left between the two lens assemblies 20 to match the user's pupil distance.

[0108] The radial extension sections of the two connecting rods are not limited in this application to their specific angles, and can be as follows: Figure 5 The second connecting rod 513 is arranged in the radial direction as shown, and can also be arranged as shown in FIG. Figure 5 The first connecting rod 320 shown in FIG. 3 has a certain inclination angle, as long as the radially extending section extends in the radial direction.

[0109] like Figure 5 、 Figure 7 and Figure 8 As shown, the focusing shaft 100 has a protruding second shoulder 102 at one end near the lens 2011. The end surface of the second shoulder 102 is used to abut against the limit plate 600, thereby limiting the axial position of the focusing shaft 100 and preventing axial movement of the focusing shaft 100. A lubricating gasket 130 is sleeved on the focusing shaft 100. The lubricating gasket 130 is located between the second shoulder 102 and the limit plate 600 and is pressed against the limit plate 600 by the second shoulder 102, providing lubrication for smooth rotation of the focusing shaft 100. The material of the lubricating gasket 130 is not limited in this application; specifically, materials such as polytetrafluoroethylene or graphite can be used.

[0110] In some embodiments of the present application, Figure 2 、 Figure 3 and Figure 8As shown, the first focusing knob 200, the second focusing knob 400 and the limit plate 600 are sequentially attached along the axial direction of the focusing shaft 100. The first end of the focusing shaft 100 is located inside the first focusing knob 200, and the second end extends into the limit plate 600, making the axial dimension of the focusing shaft 100 relatively small.

[0111] like Figure 3 and Figure 8 As shown, the first focusing knob 200 is a knob with a single-sided opening, and the opening faces the second focusing knob 400; both end surfaces of the second focusing knob 400 are provided with openings, one end is in contact with the end surface of the first focusing knob 200; the other end is in contact with the limit plate 600, so that the second adjustment space composed of the first accommodating cavity 210 and the second accommodating cavity 410 is a closed space.

[0112] This enclosed second adjustment space accommodates the first ends of the first and second transmission mechanisms 300, 500, protecting them from damage caused by external influences. For ease of description, the entirety of the first and second focusing knobs 200, 400, the stopper plate 600, and their internal structures will be referred to as the operating area.

[0113] Since the first focusing knob 200, the second focusing knob 400 and the limit plate 600 are adjacent to each other in the axial direction, the axial length of the operating area is relatively short, which is approximately equal to the sum of the axial lengths of the above three components. This makes the structure of the operating area relatively compact, and there is no need to move the hand back and forth when focusing, which makes it easier for users to focus.

[0114] The focusing axis 100, the first movable member 310, the movable bracket 511, the guide column 512 and the curved cylinder 520, which are easily damaged transmission parts, are arranged in a closed second adjustment space inside the operating area, which can protect the above-mentioned components and prevent them from being damaged by external influences; the first connecting rod 320 and the second connecting rod 513, which are not easily damaged, are extended from the second adjustment space and exposed outside the operating area, making the structure of the operating area more compact.

[0115] Next, for Figure 3 The focusing mechanism 10 is shown, and the installation steps of the focusing mechanism 10 are explained.

[0116] Step A: Thread the focusing shaft 100 and the focusing nut 1221, sleeve the lubricating gasket 130 on the focusing shaft 100, insert the second end of the focusing shaft 100 into the positioning hole 630 of the limiting plate 600, and then pass the first connecting rod 320 through the first through hole 610 of the limiting plate 600 and fix it to the focusing nut 1221.

[0117] Step B: Attach the base 530, the movable bracket 511, and the curved tube 520 in sequence, so that the limiting waist hole 531, the through hole 5111, and the curved slide groove 521 correspond one to one. Then, insert the guide column 512, and attach the second focusing knob 400 to the outside of the curved tube 520, so that the second focusing knob 400 and the curved tube 520 are snap-fitted.

[0118] Step C: Install the bearing 540 on the focusing shaft 100, and install the entire assembly assembled in step B on the focusing shaft 100, fix the base 530 to the limiting plate 600, and pass the second connecting rod 513 through the second through hole 620 of the limiting plate 600 and fix it to the movable bracket 511.

[0119] Step D: sleeve the bearing pressing ring 550 on the connecting end of the first focusing knob 200 , and connect the first focusing knob 200 to the thread of the focusing shaft 100 so that the bearing pressing ring 550 presses the bearing 540 .

[0120] Step E: Connect the first connecting rod 320 to the first lens 2011A, and connect the second connecting rod 513 to the second lens 2011B.

[0121] In some embodiments of the present application, a handheld device includes the focusing mechanism 10 of any of the above embodiments and two lens assemblies 20. The two lens assemblies 20 may have different lens types, for example, one being a visible light lens assembly and the other being an infrared lens assembly. That is, the first lens assembly 20A may be either a visible light lens assembly or an infrared lens assembly, while the second lens assembly 20B may be the other.

[0122] The handheld device provided in the embodiment of the present application adopts the focusing mechanism 10 of any of the above-mentioned embodiments. By simply rotating the first focusing knob 200 and the second focusing knob 400, the two lens assemblies 20 can be focused separately. This makes the focusing process relatively simple and also ensures clear imaging of both lens assemblies 20, thereby improving the imaging effect of the handheld device. In the handheld device provided in the embodiment of the present application, since the first focusing knob 200 and the second focusing knob 400 are both mounted on the focusing shaft 100 and arranged adjacent to each other on the focusing shaft 100, the focusing mechanism 10 has a compact structure, enabling single-handed focusing without moving the position, facilitating the user's focusing operation. In the embodiment of the present application, a first accommodating cavity 210 is provided within the first focusing knob 200, and the first end of the second transmission mechanism 500 can move within the first accommodating cavity 210 and the second accommodating cavity 410. In other words, the first end of the second transmission mechanism 500 does not need to occupy additional axial space of the focusing shaft 100, thereby improving the utilization of the axial space, allowing the focusing shaft 100 to be set shorter, and the focusing mechanism 10 is more compact in the axial direction.

[0123] In some embodiments of the present application, Figures 1 to 4As shown, the lens assembly 20 includes an objective lens assembly 201 and an eyepiece lens assembly 202 spaced apart along the optical axis. The objective lens assembly 201 includes a lens 2011 and a movement 2012 sequentially arranged along the incident direction of light.

[0124] The first focusing knob 200 and the second focusing knob 400 of the focusing mechanism 10 are located at one end close to the eyepiece assembly 202 .

[0125] The housing 203 of the lens assembly 20 is as follows: Figure 2 As shown, the lens assembly 20 comprises a front housing 203a, a middle housing 203b, and a rear housing 203c, arranged sequentially along the direction of light incidence. The front housing 203a encloses the objective lens assembly 201; the middle housing 203b serves as a grip area. The middle housings 203b of the two lens assemblies 20 are fixedly connected via a connecting plate 2031. A stop plate 600 is fixed to the side of the connecting plate 2031 near the eyepiece assembly 202.

[0126] The specific positions of the first focusing knob 200 and the second focusing knob 400 correspond to the connection between the middle housing 203b and the rear housing 203c. When using the handheld device, the user holds the middle housing 203b and when focusing is required, only one finger is required to rotate the first focusing knob 200 and the second focusing knob 400.

[0127] When using the embodiment of the present application, the first focusing knob 200 and the second focusing knob 400 are located at one end close to the eyepiece assembly 202, that is, close to the user's holding position, making operation more convenient. In addition, the weight of one end of the objective lens assembly 201 of the handheld device is reduced, so that the user has a better user experience when holding the device.

[0128] In some embodiments of the present application, Figure 1 and Figure 2 As shown, the handheld device also includes a fill light 30 and a laser ranging sensor 40. The fill light 30 and the laser ranging sensor 40 are fixed between the two middle shells 203b and located at the end of the focusing mechanism 10 near the objective lens assembly 201. The fill light 30 is used to provide auxiliary lighting in low light conditions to improve the imaging effect of the handheld device; the laser ranging sensor 40 is used to measure the distance between the handheld device and the observed object.

[0129] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0130] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0131] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application are included in the scope of protection of the present application.

Claims

1. A focusing mechanism, characterized in that: It is arranged between two lens assemblies (20) of a handheld device; each lens assembly (20) comprises a lens (2011) and a movement (2012) arranged in sequence along the incident direction of light; the focusing mechanism (10) comprises: A focusing axis (100) is arranged parallel to the optical axis of the lens assembly (20); A first focusing knob (200) is fixedly sleeved on the focusing shaft (100) and can rotate around the axial direction of the focusing shaft (100); a first transmission mechanism (300), a first end of which is in transmission connection with the first focusing knob (200), and a second end of which is connected to the first lens (2011A) or the first movement (2012A) in the first lens assembly (20A); a second focusing knob (400) rotatably sleeved on the focusing shaft (100), adjacent to the first focusing knob (200), and rotatable around the axial direction of the focusing shaft (100); a second transmission mechanism (500), a first end of which is located in a second accommodating cavity (410) between the second focusing knob (400) and the focusing shaft (100), and extends into the first accommodating cavity (210) in the first focusing knob (200); the first end of the second transmission mechanism (500) is in transmission connection with the second focusing knob (400), and the second end is connected to the second lens (2011B) or the second movement (2012B) in the second lens assembly (20B); Rotating the first focusing knob (200) to adjust the position of the first lens (2011A) or the first movement (2012A) through the first transmission mechanism (300); The second focusing knob (400) is rotated to adjust the position of the second lens (2011B) or the second movement (2012B) through the second transmission mechanism (500).

2. The focusing mechanism according to claim 1, wherein: The first transmission mechanism (300) comprises: a first moving member (310) and a first connecting rod (320); The first moving member (310) is sleeved on the focusing shaft (100) and is transmission-connected to the first focusing knob (200) via the focusing shaft (100); The first moving member (310) and the focusing shaft (100) are provided with a curved sliding groove extending in the axial direction, and the other is provided with a protrusion movably mounted on the curved sliding groove; or the first moving member (310) is threadedly connected to the focusing shaft (100); the first moving member (310) converts the rotation of the focusing shaft (100) into its own axial movement by means of the matching of the curved sliding groove and the protrusion, or by means of the threaded connection; The first connecting rod (320) is arranged on one side of the focusing shaft (100); one end of the first connecting rod (320) is fixedly connected to the first moving member (310), and the other end is fixedly connected to the first lens (2011A) or the first movement (2012A); When the first focusing knob (200) is rotated, the focusing shaft (100) rotates and drives the first moving member (310) to move axially, and drives the first lens (2011A) or the first movement (2012A) to move axially through the first connecting rod (320).

3. The focusing mechanism according to claim 1, wherein: The second transmission mechanism (500) includes: a movable member (510) and a curved cylinder (520); The movable member (510) is sleeved on the focusing shaft (100) and can move axially in a second adjustment space formed by the first accommodating cavity (210) and the second accommodating cavity (410); the curved cylinder (520) is sleeved between the movable member (510) and the second focusing knob (400), is fixedly connected to the second focusing knob (400), and can rotate around the axial direction of the focusing shaft (100); A curved sliding groove (521) is provided on the wall of the curved cylinder (520); a first end of the movable member (510) is slidably connected to the curved sliding groove (521), and a second end is connected to the second lens (2011B) or the second movement (2012B); When the curved cylinder (520) rotates, its own rotation can be converted into axial movement of the movable part (510) through the curved sliding groove (521), so that the movable part (510) drives the second lens (2011B) or the second movement (2012B) to move axially.

4. The focusing mechanism according to claim 2, wherein: The focusing shaft (100) is a stepped shaft, comprising a first shaft section (110) and a second shaft section (120); The first shaft section (110) is located at an end of the second shaft section (120) away from the lens (2011) and the movement (2012), and has a diameter greater than that of the second shaft section (120); The second transmission mechanism (500) is sleeved on the second shaft section (120) and extends to the first shaft section (110), and is sleeved with the first shaft section (110) to separate the second accommodating cavity (410) into a first adjustment space (411) located between the second transmission mechanism (500) and the second shaft section (120); The first moving member (310) is sleeved on the second shaft section (120) and can move axially within the first adjustment space (411) under the drive of the focusing shaft (100).

5. The focusing mechanism according to claim 4, wherein: A limiting plate (600) is rotatably sleeved on the focusing shaft (100); The limiting plate (600) is located at one end of the focusing shaft (100) close to the lens (2011) and the movement (2012); The first transmission mechanism (300) passes through the limiting plate (600) and is connected to the first lens (2011A) or the first movement (2012A); the second transmission mechanism (500) passes through the limiting plate (600) and is connected to the second lens (2011B) or the second movement (2012B); The limiting plate (600) is fixedly connected to the housing (203) of the lens assembly (20), and is capable of limiting the axial rotation of the first transmission mechanism (300) and the second transmission mechanism (500) around the focusing axis (100).

6. The focusing mechanism according to claim 5, wherein: The first focusing knob (200), the second focusing knob (400) and the limiting plate (600) are sequentially attached to each other along the axial direction of the focusing shaft (100); the first end of the focusing shaft (100) is located inside the first focusing knob (200), and the second end extends to the inside of the limiting plate (600).

7. The focusing mechanism according to claim 3, wherein: A base (530) is sleeved between the movable part (510) and the focusing shaft (100); The base (530) is rotatably connected to the focusing shaft (100); an end of the base (530) is fixedly connected to the housing (203) of the lens assembly (20); A limiting waist hole (531) parallel to the focusing axis (100) is provided on the outer wall of the base (530); The third end of the movable member (510) is slidably connected to the limiting waist hole (531), so that the movable member (510) can move along the axial direction of the focusing axis (100) when the curved cylinder (520) rotates.

8. The focusing mechanism according to claim 7, wherein: The movable member (510) comprises: a movable bracket (511), a guide post (512) and a second connecting rod (513); The movable bracket (511) is sleeved between the base (530) and the curved cylinder (520), and is connected to the second lens (2011B) or the second movement (2012B) via the second connecting rod (513); a through hole (5111) is provided on the movable bracket (511); The guide column (512) is arranged in the through hole (5111), the first end of the guide column (512) is movably inserted in the curved sliding groove (521), and the second end is movably inserted in the limiting waist hole (531); When the curved cylinder (520) rotates, the first end of the guide column (512) moves along the curved sliding groove (521), and the second end moves along the limiting waist hole (531), so as to drive the movable bracket (511) and the second connecting rod (513), as well as the second lens (2011B) or the second movement (2012B) to move axially.

9. The focusing mechanism according to claim 1, wherein: The outside of the first focusing knob (200) is provided with a plurality of first protrusions (220) spaced apart along the circumferential direction; the outside of the second focusing knob (400) is provided with a second protrusion (420).

10. A handheld device, characterized in that: The invention comprises the focusing mechanism (10) according to any one of claims 1 to 9 and two lens assemblies (20); the lens types of the two lens assemblies (20) are different.

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