Focusing device
By using a spiral-designed focusing guide pin in conjunction with a connecting hole, the mechanical structure of the lens is simplified, overcoming the shortcomings of the cam focusing device in terms of weight reduction and miniaturization, thus achieving weight reduction and miniaturization of the lens.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHAN GUIDE INFRARED CO LTD
- Filing Date
- 2025-06-12
- Publication Date
- 2026-04-10
Smart Images
Figure CN224109711U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of lens focusing, in particular to a focusing device. BACKGROUND
[0002] The cam focusing device mainly adopts a single-piece focusing mechanism, and its core principle is to realize fine adjustment of focal length by adjusting the front and back positions of a single lens in an optical system. However, this focusing method has significant limitations in the lightweight and miniaturization of lens design.
[0003] Specifically, the cam focusing device adopts a single-piece focusing structure, and the complexity and space occupation of the internal mechanical components are relatively large. In order to realize the accurate movement of the single lens, a focusing cam, a connecting barrel, a guide pin, an elastic return component (such as a spring), and other components are required. The focusing cam is used to convert rotary motion into linear motion, and the connecting barrel carries the lens and realizes linear reciprocation. The existence of these components makes the structure of the entire focusing system complex. This not only limits the further reduction of the overall size of the lens, but also increases the weight burden of the lens. In the design of modern optical products that pursue device portability, integration, and high efficiency, this limitation is particularly prominent. SUMMARY
[0004] The present application provides a focusing device, which can solve the obvious deficiencies of the cam focusing device in lightweight and miniaturization design due to the adoption of a single-piece focusing structure in the related art.
[0005] The present application provides a focusing device, which can solve the obvious deficiencies of the cam focusing device in lightweight and miniaturization design due to the adoption of a single-piece focusing structure in the related art.
[0006] In some embodiments, the mounting surface of the lens is further provided with an oblong hole, and the focusing guide pin is arranged in the oblong hole.
[0007] In some embodiments, the imaging assembly comprises a connecting barrel, and the first connecting hole is arranged on the connecting barrel; and an imaging module is arranged at an end of the connecting barrel away from the lens of the lens.
[0008] In some embodiments, at least one set of bearing guide pin groups is further connected to the connecting barrel, the bearings of the bearing guide pin groups are connected to the lens, and the connecting portions are installed through gap fitting.
[0009] In some embodiments, a plurality of first sealing rings are arranged on the connecting cylinder, and outer walls of the first sealing rings are in contact with inner walls of the mounting cavity.
[0010] In some embodiments, the focusing assembly comprises a fixed shell, an internal connecting cavity of the fixed shell is arranged towards the first connecting hole, a focusing cam is connected in the connecting cavity, a second end of the focusing cam extends out of the connecting cavity, the second connecting hole is arranged at the second end of the focusing cam, a focusing hand wheel is rotatably connected to the fixed shell at an axis of the fixed shell and is located at an opposite end of the focusing cam, and the focusing hand wheel is fixedly connected to the first end of the focusing cam.
[0011] In some embodiments, a groove is arranged on the focusing hand wheel, and a boss adapted to the groove is arranged on the focusing cam.
[0012] In some embodiments, a cam pressing ring is threadedly connected to the fixed shell in the connecting cavity, and one end of the cam pressing ring is used to abut against the focusing cam.
[0013] In some embodiments, a cam spacer is arranged between the cam pressing ring and the focusing cam.
[0014] In some embodiments, a second sealing ring is arranged between the focusing cam and the fixed shell.
[0015] The technical scheme provided by the embodiments of the present application has the following beneficial effects:
[0016] The embodiments of the present application provide a focusing device. Since the wall of the second connecting hole is helical, and the helical diameter gradually narrows or widens along the axial direction, when the focusing assembly rotates, the focusing guide pin moves in the second connecting hole, and the helical profile of the second connecting hole forces the focusing guide pin to move in the radial direction, thereby effectively driving the linear position of the imaging assembly, achieving accurate adjustment of the position of the imaging assembly, and achieving the purpose of focusing. Through the driving of one focusing assembly, the movement of the entire imaging assembly is driven, additional transmission and guidance are reduced, the volume of the lens is more effectively compressed, and the weight is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0018] Figure 1 The overall schematic diagram provided by the embodiments of the present application is shown.
[0019] Figure 2 A schematic diagram for showing the imaging assembly provided by the embodiment of the present application;
[0020] Figure 3 A schematic diagram for showing the focusing assembly provided by the embodiment of the present application;
[0021] Figure 4 A schematic diagram for showing the second connecting hole and the focusing guide pin provided by the embodiment of the present application;
[0022] Figure 5 A schematic diagram for showing the focusing cam and the focusing hand wheel provided by the embodiment of the present application;
[0023] In the figure: 1, lens; 10, mounting cavity; 11, mounting surface; 2, imaging assembly; 20, connecting barrel; 200, first sealing ring; 21, imaging module; 3, first connecting hole; 4, focusing assembly; 40, fixed housing; 400, connecting cavity; 401, cam pressing ring; 402, cam spacer; 41, focusing cam; 410, boss; 42, focusing hand wheel; 420, groove; 421, fixing pin; 5, second connecting hole; 6, focusing guide pin; 7, long circular hole; 8, bearing guide pin group; 9, second sealing ring. DETAILED DESCRIPTION
[0024] In order to enable persons skilled in the art to better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor fall within the scope of protection of the present application.
[0025] The embodiment of the present application provides a focusing device, which can solve the problem that the single-piece focusing structure is adopted in the cam focusing device in the related art, and there is obvious deficiency in the lightweight and small-sized design.
[0026] Reference is made to Figures 1 to 5As shown, the embodiment of the present application provides a focusing device, which comprises a lens 1 and an imaging assembly 2, a focusing assembly 4 and a focusing guide pin 6. The lens 1 has a mounting cavity 10 therein, the imaging assembly 2 is arranged in the mounting cavity 10, and the imaging assembly 2 is provided with a first connecting hole 3, the lens 1 is further provided with a mounting surface 11 adapted to the focusing assembly 4, one end of the focusing assembly 4 is rotatably connected to the mounting surface 11, and the end of the focusing assembly 4 rotatably connected to the mounting surface 11 is provided with a second connecting hole 5. Finally, one end of the focusing guide pin 6 is connected to the first connecting hole 3, and the other end is connected to the second connecting hole 5, and the hole wall of the second connecting hole 5 is spirally arranged, and the spiral diameter gradually narrows or widens along the axial direction.
[0027] In specific operation, since the focusing guide pin 6 is connected to the first connecting hole 3 of the imaging assembly 2 and the second connecting hole 5 of the focusing assembly 4 respectively, a mechanical linkage can be formed. The focusing guide pin 6 is spirally matched with the second connecting hole 5, so that when the focusing assembly 4 rotates around the mounting surface 11, the focusing guide pin 6 slides in the second connecting hole 5, but at the same time, the focusing guide pin 6 is constrained by the radial variable diameter of the second connecting hole 5, forcing the focusing guide pin 6 to slide along the spiral path. When the focusing guide pin 6 moves in the second connecting hole 5 along the spiral path, the radial movement generates a component force in the axial direction, thereby pushing the imaging assembly 2 to move linearly along the optical axis direction. The linear displacement of the imaging assembly 2 changes the distance between the lens 1 and the imaging assembly 2, thereby realizing the adjustment of the focal length. The present application does not need complex mechanical structure or additional transmission components, and the movement of the entire imaging assembly 2 is driven by one drive of the focusing assembly 4, reducing additional transmission and guidance, and more effectively compressing the volume and reducing the weight of the lens 1.
[0028] In the present application, in order to avoid the focusing guide pin 6 rotating along the optical axis center, a long circular hole 7 is further arranged at the mounting surface 11 of the lens 1, and the focusing guide pin 6 is arranged in the long circular hole 7. When the focusing assembly 4 rotates, the focusing guide pin 6 is constrained by the radial wall of the long circular hole 7 and cannot freely rotate around the optical axis center. Thus, the focusing guide pin 6 can only move radially, thereby driving the imaging assembly 2 to move linearly.
[0029] In the application, the imaging assembly 2 is provided with a connecting barrel 20 and an imaging module 21. The first connecting hole 3 is formed on the connecting barrel 20, the connecting barrel 20 is coaxially arranged with the lens 1, the connecting barrel 20 is in contact with the lens 1 through the circumferential surface, the axial direction of the first connecting hole 3 is perpendicular to the axial direction of the connecting barrel 20, and the imaging module 21 is arranged at the lens end of the connecting barrel 20 away from the lens 1. First, the focusing guide pin 6 is precisely matched with the connecting barrel 20 through the first connecting hole 3, so as to avoid that the thread bears a large pressure during focusing, and also to ensure the accurate positioning of the focusing guide pin 6. In addition, the connecting barrel 20 and the lens 1 are matched through the tolerance of the circumferential surface, so as to ensure that the optical axis of the lens 1 is always consistent when the connecting barrel 20 moves linearly, so as to avoid the optical axis deviation or inclination caused by poor matching. In the application, at least one set of bearing guide pin group 8 is further connected to the connecting barrel 20, the bearing of the bearing guide pin group 8 is connected with the lens 1, and is installed through gap matching at the connecting position. The bearing guide pin group 8 can ensure that the imaging assembly 2 is not inclined horizontally, and at the same time, the sliding friction is converted into rolling friction by relying on the bearing guide pin group 8, so as to reduce the resistance when the imaging assembly 2 moves linearly, and to ensure the stable and reliable linear motion of the imaging assembly 2.
[0030] In the application, based on other embodiments, no flexible filling material is arranged between the connecting barrel 20 and the lens 1, and the size of the gap between the connecting barrel 20 and the lens 1 will directly affect the torque of the rotary focusing assembly 4. If the gap is too small, the rotary focusing assembly 4 will be more difficult, and if the gap is too large, the connecting barrel 20 will be inclined during rotation, causing the optical axis to deviate.
[0031] Therefore, in the application, a plurality of first sealing rings 200 are arranged on the connecting barrel 20, and the outer wall of the first sealing ring 200 is in contact with the inner wall of the mounting cavity 10. The first sealing ring 200 can ensure that the connecting barrel 20 moves smoothly and uniformly, and avoid that the imaging assembly 2 moves under vibration impact. It can also eliminate the influence of the gap between the connecting barrel 20 and the lens 1, so that the connecting barrel 20 moves moderately;
[0032] In the present application, the focusing assembly 4 is provided and includes a fixed housing 40, a focusing cam 41, and a focusing hand wheel 42. The fixed housing 40 is internally provided with a connecting cavity 400, and the cavity opening of the connecting cavity 400 faces the first connecting hole 3; the first end of the focusing cam 41 is connected in the connecting cavity 400, and the second end extends out of the connecting cavity 400, wherein the second connecting hole 5 is arranged at the second end of the focusing cam 41. The internal connecting cavity 400 of the fixed housing 40 makes the overall structure of the focusing assembly 4 compact, reducing the occupied space. The focusing hand wheel 42 is rotatably connected to the fixed housing 40 about the axis of the fixed housing 40 and is located at the opposite end of the focusing cam 41, and the focusing hand wheel 42 is fixedly connected to the first end of the focusing cam 41 through a fixing nail 421. The fixed housing 40 and the focusing hand wheel 42 are matched through a circumferential surface gap, which reduces the machining precision requirement of the fixed housing 40, and the focusing cam 41 and the fixed housing 40 are matched through a cylindrical surface tolerance, which ensures the center offset amount of the focusing cam 41 when rotating. When the focusing hand wheel 42 rotates, the focusing cam 41 is driven to rotate synchronously through the fixed connection. Due to the specific hole wall design of the second connecting hole 5, the focusing guide nail 6 will be forced to produce a radial and axial composite displacement during rotation, thereby driving the imaging assembly 2 to move linearly along the optical axis direction, achieving accurate focusing.
[0033] In the present application, if there is a gap between the focusing hand wheel 42 and the focusing cam 41, when the focusing hand wheel 42 rotates, due to the existence of the gap, the focusing cam 41 may not immediately respond to the rotation of the focusing hand wheel 42, but will start to follow the rotation after the focusing hand wheel 42 rotates by a certain angle. This delayed response will cause the focusing position to be inaccurate, that is, backlash occurs. To avoid backlash of the focusing cam 41 when the focusing hand wheel 42 rotates, a groove 420 is arranged on the focusing hand wheel 42, and a boss 410 adapted to the groove 420 is arranged on the focusing cam 41, the boss 410 is clamped in the groove 420, realizing the close cooperation between the focusing hand wheel 42 and the focusing cam 41. The boss 410 is embedded in the groove 420, eliminating the gap between the two, ensuring that the focusing cam 41 can immediately follow the rotation when the hand wheel rotates.
[0034] In the present application, a cam pressing ring 401 is also threadedly connected with the fixed housing 40 in the connecting cavity 400, and one end of the cam pressing ring 401 is used to abut against the focusing cam 41. The cam pressing ring 401 presses the focusing cam 41, which can prevent the focusing cam 41 from moving up and down, and through the threaded connection, the cam pressing ring 401 can be tightened during installation, greatly improving the installation convenience and reliability.
[0035] In addition, a cam spacer 402 is arranged between the cam pressing ring 401 and the focusing cam 41. The cam spacer 402 is made of engineering plastic and is arranged between the cam pressing ring 401 and the focusing cam 41, which can weaken the friction between the cam pressing ring 401 and the focusing cam 41, and reduce the torque required during focusing.
[0036] Further, a second sealing ring 9 is arranged between the focusing cam 41 and the fixed housing 40. The focusing cam 41 and the fixed housing 40 are designed with a sealing ring to ensure the sealing of the whole handheld device.
[0037] The principle of the embodiment of the present application is that the focusing assembly 4 is rotatably connected to the mounting surface 11, and the end of the focusing assembly 4 rotatably connected to the mounting surface 11 is provided with a second connecting hole 5. Finally, the focusing guide pin 6 is connected to the first connecting hole 3 at one end and to the second connecting hole 5 at the other end, and the hole wall of the second connecting hole 5 is designed in a spiral shape, and the spiral diameter gradually narrows or widens along the axial direction. When the focusing assembly 4 rotates around the mounting surface 11, the focusing guide pin 6 slides in the second connecting hole 5, and at the same time, the focusing guide pin 6 is constrained by the radial variable diameter of the second connecting hole 5, forcing the focusing guide pin 6 to slide along the spiral path. When the focusing guide pin 6 moves in the second connecting hole 5 along the spiral path, this radial movement generates a component force in the axial direction, thereby pushing the imaging assembly 2 to move linearly along the optical axis direction. The linear displacement of the imaging assembly 2 changes the distance between the lens 1 and the imaging assembly 2, thereby achieving the adjustment of the focal length. The present application does not require complex mechanical structures or additional transmission components, and the movement of the entire imaging assembly 2 is driven by one drive of the focusing assembly 4, reducing additional transmission and guidance, and more effectively compressing the volume and reducing the weight of the lens 1.
[0038] In the description of the present application, it should be noted that the positions or position relationships indicated by the terms "upper", "lower", etc. are based on the positions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0039] It should be noted that, in the present application, the relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.
[0040] The foregoing is merely illustrative of the principles of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The above embodiments are illustrative, and not restrictive, of the scope of the application.
Claims
1. A focusing device, characterized by It includes: The lens (1) has a mounting cavity (10) inside; An imaging assembly (2) is arranged in the mounting cavity (10), and the imaging assembly (2) is provided with a first connecting hole (3); A focusing assembly (4) is arranged on the shell of the lens (1), and the focusing assembly (4) is rotatably connected to the mounting surface (11) at one end, and the end of the focusing assembly (4) rotatably connected to the mounting surface (11) is provided with a second connecting hole (5); A focusing guide pin (6) is connected at one end in the first connecting hole (3) and at the other end in the second connecting hole (5), and the hole wall of the second connecting hole (5) is arranged in a spiral, and the spiral diameter gradually narrows or widens along the axial direction.
2. A focusing device as claimed in claim 1, characterized in that: The mounting surface (11) of the lens (1) is also provided with an oblong hole (7), and the focusing guide pin (6) is arranged in the oblong hole (7).
3. A focusing device as claimed in claim 1, characterized in that: The imaging assembly (2) includes: A connecting barrel (20) is provided with the first connecting hole (3); An imaging module (21) is arranged at the end of the connecting barrel (20) away from the lens of the lens (1).
4. A focusing device as claimed in claim 3, characterized in that: At least one set of bearing guide pin groups (8) is connected to the connecting barrel (20), the bearing of the bearing guide pin group (8) is connected to the lens (1), and the connection is installed through a gap fit.
5. A focusing device as claimed in claim 3, characterized in that: A plurality of first sealing rings (200) are arranged on the connecting barrel (20), and the outer wall of the first sealing ring (200) is in contact with the inner wall of the mounting cavity (10).
6. A focusing device as claimed in claim 1, characterized in that: The focusing assembly (4) includes: A fixed shell (40) is provided with a connecting cavity (400) inside, and the cavity opening of the connecting cavity (400) faces the first connecting hole (3); A focusing cam (41) is connected at the first end in the connecting cavity (400) and extends out of the connecting cavity (400) at the second end, and the second connecting hole (5) is arranged at the second end of the focusing cam (41); A focusing hand wheel (42) is rotatably connected to the fixed shell (40) around the axis of the fixed shell (40) and located at the end opposite to the focusing cam (41), and the focusing hand wheel (42) is fixedly connected to the first end of the focusing cam (41).
7. A focusing device as claimed in claim 6, characterized in that: The focusing hand wheel (42) is provided with a groove (420), and the focusing cam (41) is provided with a boss (410) matched with the groove (420).
8. A focusing device as claimed in claim 6, characterized in that: The connecting cavity (400) is threadedly connected with a cam pressing ring (401) at one end for abutting and pressing the focusing cam (41).
9. A focusing device as claimed in claim 8, characterized in that: A cam spacer (402) is arranged between the cam pressing ring (401) and the focusing cam (41).
10. A focusing device as claimed in claim 6, characterized in that: A second sealing ring (9) is arranged between the focusing cam (41) and the fixed shell (40).