Focusing mechanism

Abstract

The utility model discloses a focusing mechanism, which comprises a driving mechanism and a focusing assembly, and the focusing assembly comprises a focusing lens cone. The driving mechanism comprises a guide nail arranged on the focusing lens cone and a driving cam matched with the guide nail; at least one repulsive force piece is arranged on the axial side of the guide nail, and the repulsive force piece provides internal repulsive force or external repulsive force pointing to the port of the focusing lens barrel so as to eliminate the gap between the guide nail and the driving cam. According to the scheme, the gap between the guide nail and the driving cam is eliminated through the internal repulsive force or the external repulsive force generated by the repulsive force piece, so that shaking caused by position change can be prevented, and the imaging influence of shaking of the moving lens group on the optical system is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, in particular to a focusing mechanism. Background Art

[0002] Current optical lenses typically incorporate a focusing function to achieve clear imaging of objects at varying distances. This focusing function is achieved by axially moving the focusing barrel relative to the main barrel. To drive the movement of the focusing barrel, a drive mechanism is commonly employed. This drive mechanism comprises a guide pin mounted on the main barrel and a drive cam that engages the guide pin. The guide pin moves with the focusing barrel and, under the action of the drive cam, drives the focusing barrel along the optical axis, thereby achieving the focusing function.

[0003] However, in existing focusing mechanisms, the gap between the guide pin and the drive cam often causes focusing lag during the focusing process, especially when the focusing direction is reversed, affecting focusing accuracy and speed. Furthermore, when the lens is subjected to external impact, the gap can cause the focusing barrel to vibrate, further affecting image quality.

[0004] Therefore, there is an urgent need to provide a focusing mechanism that has a simple structure, is easy to assemble, and is low in cost, while being able to effectively eliminate the focusing gap and improve the focusing performance. Utility Model Content

[0005] In order to at least solve one or more of the technical problems mentioned above, the present invention proposes a focusing mechanism.

[0006] The utility model provides a focusing mechanism, comprising a driving mechanism and a focusing assembly, wherein the focusing assembly comprises a focusing barrel; the driving mechanism comprises a guide pin arranged on the focusing barrel and a driving cam matched with the guide pin; at least one repulsive member is arranged on the axial side of the guide pin, wherein the repulsive member provides an internal repulsive force or an external repulsive force directed to a port of the focusing barrel to eliminate the gap between the guide pin and the driving cam.

[0007] In one embodiment, the force-bearing portion of the repulsive member abuts against the focusing assembly.

[0008] In one embodiment, the guide pin is provided on one side of the focusing lens barrel.

[0009] In one embodiment, the driving cam is disposed outside the focusing lens barrel.

[0010] In one embodiment, the repulsive member includes an elastic member or a magnetic component.

[0011] In one embodiment, the elastic member is a spring, and the magnetic assembly includes two magnets that repel or attract each other.

[0012] In one embodiment, the number of the elastic member or magnetic component is one or more.

[0013] In one embodiment, the repulsion member is a nested structure, which includes: a guide rod, one end of which is connected to the focusing lens barrel; and the elastic member, which is sleeved outside the guide rod or embedded in the guide rod; or a guide rod, one end of which is connected to the focusing lens barrel; and the magnetic assembly, one of the two magnets included in it is sleeved outside the guide rod or embedded in the guide rod, and the other of the two magnets included in it is arranged on a structure opposite to the focusing lens barrel.

[0014] In one embodiment, the repulsive force direction of the repulsive member is coaxial with the impact direction of the external force applied to the focusing lens barrel.

[0015] In one embodiment, the repulsive members are provided on both axial sides of the guide pin.

[0016] In one embodiment, the guide pin passes through a main barrel sleeved outside the focusing barrel and is connected to the focusing barrel, and a straight groove is provided between the guide pin and the main barrel; the guide pin includes a rod and a head connected in sequence, the rod is inserted in the straight groove, and the head cooperates with the driving cam.

[0017] In one embodiment, the diameter of the head portion is smaller than the diameter of the stem portion.

[0018] In one embodiment, the stem has a polygonal cross-section.

[0019] In one embodiment, the polygonal cross section is a regular hexagonal cross section.

[0020] Through the focus adjustment mechanism provided above, the present invention eliminates the gap between the guide pin and the drive cam through the internal or external repulsive force generated by the repulsive member, thereby preventing the shaking caused by position changes. This structure stabilizes the moving lens assembly in the tilt direction, thereby eliminating the impact of the shaking of the moving lens assembly on the imaging of the optical system. As a result, this solution eliminates the problem of asynchronous position (return difference) between the drive mechanism and the moving lens assembly when the zoom lens changes direction, thereby resolving the imaging problems caused by this problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description read in conjunction with the accompanying drawings, in which:

[0022] Figure 1 An exemplary structural diagram of a focusing mechanism of some embodiments of the present application is shown;

[0023] Figure 2 A sectional view of a zoom lens of some embodiments of the present application is shown;

[0024] Figure 3 A structural diagram of a guide pin of some embodiments of the present application is shown;

[0025] Figure 4 A structural diagram of a focusing lens barrel when the repulsive member of the present application includes one elastic member or magnetic assembly is shown;

[0026] Figure 5 A structural diagram of a focusing lens barrel when the repulsive member of the present application includes two elastic members or magnetic assemblies is shown;

[0027] Figure 6 An exemplary structural diagram of a zoom lens of some embodiments of the present application is shown;

[0028] Figure 7 An exemplary structural diagram of a zoom lens of some other embodiments of the present application is shown;

[0029] Figure 8 An exemplary structural diagram of a zoom lens of some other embodiments of the present application is shown; Figure 7 An exemplary structural diagram of the repulsive member in

[0030] Figure 9 An exemplary structural diagram of a zoom lens of some other embodiments of the present application is shown;

[0031] Figure 10 An exemplary structural diagram of the repulsive member in Figure 9 DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work fall within the protection scope of the present application.

[0033] ​It should be understood that the terms "include" and "comprising" used in the description and claims of the present invention indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0034] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in this utility model specification and claims refers to any and all possible combinations of one or more of the associated listed items, including and including these combinations.

[0035] As used in this specification and claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0036] The specific implementation of the present utility model will be described in detail below with reference to the accompanying drawings.

[0037] Figure 1 FIG2 shows an exemplary structural diagram of a focusing mechanism 100 according to some embodiments of the present invention. The focusing mechanism 100 of this solution can be applied in a zoom lens.

[0038] like Figure 1 As shown in FIG, the focusing mechanism 100 may include a drive mechanism and a focusing assembly. The focusing assembly may include a focusing barrel 1. The drive mechanism may include a guide pin 2 disposed on the focusing barrel 1 and a driving cam 3 engaged with the guide pin 2. The guide pin 2 may be disposed on one side of the focusing barrel 1, and the driving cam 3 may be disposed on the outside of the focusing barrel 1 to drive the guide pin 2. When focusing the lens, the guide pin 2 may be driven by an independent cam mechanism.

[0039] In one embodiment, at least one repulsive member ( Figure 1, a repulsive member 4 is shown as an example, wherein the repulsive member 4 can provide an inward repulsive force (in the direction indicated by the left arrow in the figure) or an outward repulsive force (in the direction indicated by the right arrow in the figure) directed toward the end of the focusing lens barrel 1 to eliminate the gap between the guide pin 2 and the driving cam 3. In short, each repulsive member 4 can provide repulsive forces in two directions, thereby eliminating the gap between the guide pin 2 and the driving cam 3 on different sides.

[0040] It is understood that when the moving lens assembly of the zoom lens (located in the focusing barrel) is subjected to force, the force is directed toward one end of the lens. To overcome problems such as shaking of the focusing barrel caused by external force impact, in one embodiment, the repulsive force of the repulsive member 4 can be coaxial with the direction of the external force impacting the focusing barrel 1. This repulsive force causes mutual repulsion between the moving lens assembly and its containing body (main barrel), causing the moving lens assembly to be subjected to a unidirectional force directed toward the front or rear end of the lens, thereby eliminating the gap between the drive mechanism and the moving lens assembly.

[0041] In one or more embodiments, the repulsive member 4 may include an elastic member or a magnetic assembly. In one application scenario, the elastic member may be a spring, and the magnetic assembly may be two magnets that repel each other (same-polar magnets) or attract each other (opposite-polar magnets). Furthermore, the magnets may include, for example, magnets. The elastic member may be a packaged structure or an independent structure, and the magnetic assembly may be an independent structure. The assembly difficulty of the magnetic assembly is lower than that of the elastic member.

[0042] Based on different needs, the number of elastic members or magnetic assemblies can be one or more, for example, two, three, or four. When each repulsive member includes one elastic member or magnetic assembly, the cost of the focusing mechanism is lower. When each repulsive member includes multiple elastic members or magnetic assemblies, the multiple elastic members or magnetic assemblies can be positioned at multiple locations, thereby applying repulsive forces to the guide pin and the focusing lens barrel at multiple locations, thereby minimizing the gap between the guide pin and the drive cam.

[0043] This utility model eliminates the gap between the guide pin and the drive cam through the internal or external repulsive force generated by the repulsive member, thereby preventing the shaking caused by position changes. This structure stabilizes the moving lens assembly in the tilt direction, thereby eliminating the impact of the shaking of the moving lens assembly on the imaging of the optical system. As a result, this solution eliminates the problem of asynchrony (return difference) between the drive mechanism and the moving lens assembly when the zoom lens changes direction, thereby resolving the imaging problems caused by this problem.

[0044] The guide pins and the focusing barrel can be connected in a variety of ways. Figure 2 and Figure 3 The connection structure between the guide pin and the focusing lens barrel will be described. Figure 2shows a cross-sectional view of a zoom lens 200 according to some embodiments of the present invention, Figure 3 Shown are structural schematic diagrams of guide nails in some embodiments of the present utility model.

[0045] like Figure 2 As shown in , the zoom lens 200 may further include a main barrel 4 that is sleeved outside the focusing barrel 1 and coaxially arranged therewith. The guide pin may pass through the side wall of the main barrel 4 and be connected to the focusing barrel 1, and a straight groove 7 may be provided between the guide pin and the main barrel 4. The guide pin includes a rod portion 22 and a head portion 21 that are connected in sequence. The rod portion 22 is inserted into the straight groove 7, and its bottom portion is inserted into the focusing barrel 1. The head portion 21 of the guide pin cooperates with the driving cam 3. Figure 2 and Figure 3 As shown in the figure, the diameter of the head 21 of the guide nail can be smaller than the diameter of the rod 22. The head 21 is small enough to fit the inner curve cam (driving cam 3) to form a complete solid circle, which makes the guide nail free of the risk of processing defects and has strong impact resistance.

[0046] like Figure 3 As shown in FIG, the rod portion 22 of the guide nail may have a polygonal cross section (for example, the upper portion of the rod portion 22 may have a polygonal cross section), and the polygonal cross section may be Figure 3 The regular hexagonal cross-section shown in the figure overcomes the poor impact resistance of existing straight cylindrical guide pins. Furthermore, the guide pin can be integrally formed, thus meeting the requirements of simple processing and easy disassembly. In addition to this shape, the polygonal cross-section can also be a polygonal shape, such as a regular quadrilateral or a regular pentagon.

[0047] In terms of the structure of the repulsive member, in one embodiment, the force-bearing portion of the repulsive member can abut against the focusing assembly, thereby applying a repulsive force to the focusing assembly, which in turn causes the guide pin to apply force to eliminate the gap between it and the drive cam. In one implementation, the force-bearing portion of the repulsive member can abut against the focusing barrel. For example, when the repulsive member includes an elastic member, one end of the elastic member can directly abut against the focusing barrel, and the other end of the elastic member can abut against the main barrel. When the repulsive member includes two magnets, one of the two magnets can directly abut against the focusing barrel, and the other of the two magnets can abut against the main barrel.

[0048] In order to protect the repulsion member and prevent it from being damaged, a receiving groove can be provided on the focusing barrel, and an elastic member or a magnet can be placed in the receiving groove, and the elastic member or the magnet can be abutted against the bottom of the receiving groove, and the other end of the elastic member or the other magnet can be abutted against the main barrel.

[0049] In one embodiment, the repulsive member can be arranged on the opposite side of the guide pin, and the opposite side is the side opposite to the guide pin, and specifically can be a range directly opposite to the guide pin. For example, when the repulsive member includes an elastic member, it can be arranged at a position on the focusing barrel that is directly opposite to the guide pin (for example, a point on the axial direction of the guide pin) or a position that is offset from this position. When the repulsive member includes a magnetic assembly, one of the magnets can also be arranged at a position on the focusing barrel that is directly opposite to the guide pin or at a position that is offset from this position, and the other magnet can be arranged at a position on the main barrel that corresponds to the magnet. Figure 4 FIG. 1 shows a schematic structural diagram of the focusing lens barrel 1 when the repulsive member of the present invention includes an elastic member or a magnetic component. Figure 4 As shown in , an elastic member included in the repulsive member or a magnet of the magnetic assembly (not shown in the figure) can be arranged in the receiving groove 8 of the focusing lens barrel 1 on the opposite side of the guide pin 2.

[0050] When the repulsive member includes multiple elastic members, one of them can be arranged on the focusing barrel at a position directly opposite the guide pin, and the others can be arranged at positions slightly offset from this position. They can also be arranged with the axial direction of the guide pin as a reference, for example, on both sides of the axial direction of the guide pin, and symmetrically or asymmetrically arranged with respect to the axial direction of the guide pin. When the repulsive member includes multiple magnetic assemblies, the multiple magnets in these magnetic assemblies that need to be arranged on the focusing barrel (one magnet in each magnetic assembly) can be arranged on the focusing barrel similarly to the multiple elastic members described above, and the other multiple magnets in these magnetic assemblies are arranged at corresponding positions on the main barrel. Figure 5 FIG. 1 shows a schematic structural diagram of the focusing lens barrel 1 when the repulsive member of the present invention includes two elastic members or magnetic components. Figure 5 As shown in FIG, two elastic members or two magnets (belonging to two magnetic assemblies) are arranged on both sides of the guide pin 2 in the axial direction and are respectively located in the receiving grooves 91 and 92 of the focusing lens barrel 1 .

[0051] Arranging the repulsive member on the opposite side of the guide nail can make full use of the larger space on the opposite side of the guide nail, making it easier to assemble and allowing the force arm to be larger.

[0052] In another embodiment, the repulsive member may be disposed on the same side of the guide pin, for example, the elastic member or one magnet in the magnetic assembly may be disposed on the same side of the guide pin. In yet another embodiment, the multiple elastic members or magnets included in the repulsive member may be disposed on the same side and opposite side of the guide pin, respectively.

[0053] The above describes the arrangement of a single repulsive member. In another embodiment, the focusing mechanism may include multiple repulsive members, for example, two or three. In this case, repulsive members may be provided on both axial sides of the guide pin, and these repulsive members may be arranged symmetrically or asymmetrically about the guide pin's axis. The arrangement of multiple repulsive members can refer to the arrangement of multiple elastic members or multiple magnetic assemblies described above and will not be described in detail here.

[0054] In order to further illustrate the arrangement and working principle of the repulsive member including only the elastic member or the magnetic component, the present invention will be combined with Figure 5 This is explained by referring to the structure of a zoom lens. Figure 6 An exemplary structural diagram of a zoom lens 600 according to some embodiments of the present invention is shown.

[0055] like Figure 6 As shown in FIG, zoom lens 600 includes a main lens barrel 4, a focusing lens barrel 1 housed within the main lens barrel 4 (the two can be coaxially arranged), and a focusing mechanism including a driving cam 3, a guide pin 2, the focusing lens barrel 1, a first magnet 5, and a second magnet 6, which repel each other. The structures of the main lens barrel 4, the focusing lens barrel 1, the driving cam 3, and the guide pin 2 can be found in the description of the previous embodiment and will not be described in detail here.

[0056] like Figure 6 As shown in , the first magnet 5 is arranged on the opposite side of the guide pin 2, and is directly arranged on the side wall (e.g., outer wall) of the focusing barrel 1, and the second magnet 6 is arranged on the side wall (e.g., outer wall) of the main barrel 4, and the position corresponds to the first magnet 5. In this embodiment, the side wall of the focusing barrel 1 where the first magnet 5 is located and the side wall of the main barrel 4 where the second magnet 6 is located are the same side walls, so that the two magnets are closer and the force acting on them is greater. In order to increase the force acting between the first magnet 5 and the second magnet 6, the central axes of the first magnet 5 and the second magnet 6 can be on the same straight line, and the direction of the straight line can be coaxial with the direction of the external force impacting the focusing barrel 1, so that when the zoom lens 500 is impacted by an external force, the repulsive force acting on the focusing barrel 1 is the largest, thereby maximally eliminating the gap between the guide pin 2 and the drive cam 3 on the a side.

[0057] It is understood that the arrangement of the two magnets described above is merely exemplary and non-restrictive. Those skilled in the art may modify the arrangement of the repulsive member. For example, the first magnet 5 may be arranged on the end surface of the focusing barrel 1 opposite the main barrel 4, and the second magnet 6 may be correspondingly arranged on the end surface of the main barrel 4 opposite the focusing barrel 1. Furthermore, a receiving groove for accommodating an elastic member or a magnetic member may be provided on the focusing barrel 1 and / or the main barrel 4. For example, the second magnet 6 may be arranged as described above, but the first magnet 5 may be arranged in the receiving groove of the focusing barrel 1; or, the first magnet 5 may be arranged as described above, and the second magnet 6 may be arranged in the receiving groove of the main barrel 4; or, the first magnet 5 and the second magnet 6 may be arranged in the receiving grooves of the focusing barrel 1 and the main barrel 4, respectively. When the repulsive member includes two mutually attractive magnets, it may also adopt this structure to arrange the two magnets, thereby relying on the attractive force of the two magnets to eliminate the gap between the guide pin 2 and the drive cam 3 on the b side.

[0058] The above describes the arrangement of the repulsive member when it includes an elastic member or a magnetic assembly. In other embodiments, the repulsive member can also be a nested structure, which can include a guide rod and the elastic member described in the above embodiments. In this case, one end of the guide rod can be connected to the focusing lens barrel, and the elastic member can be mounted outside the guide rod or embedded in the guide rod. To protect the nested repulsive member, it can be installed in a receiving groove of the focusing lens barrel. In this case, the guide rod can be set in the placement groove of the focusing lens barrel, and one end of it is connected to the bottom of the receiving groove.

[0059] In order to clearly describe the structure, arrangement and working principle of the nested repulsive member including the elastic member, the present invention will be described in detail below in conjunction with the structure of the zoom lens. Figure 7 illustrative structural diagrams of zoom lenses 700 according to other embodiments of the present invention are shown. Figure 8 Shown Figure 7 An exemplary structural diagram of the repulsive member in FIG.

[0060] like Figure 7 As shown in FIG, a zoom lens 700 includes a main lens barrel 4, a focus lens barrel 1 sleeved within the main lens barrel 4, and a focus mechanism including a driving cam 3, a guide pin 2, the focus lens barrel 1, a guide rod 10, and a spring 11. The structures of the main lens barrel 4, the focus lens barrel 1, the driving cam 3, and the guide pin 2 can be found in the description of the previous embodiment and will not be described in detail here.

[0061] Further Figure 7 As shown in FIG, a receiving groove 8 is provided on the focusing lens barrel 1, with the groove opening facing the opening side of the main lens barrel 4. A guide rod 10 is partially located in the receiving groove 8, and its other end extends out of the receiving groove 8. One end of the guide rod 10 located in the receiving groove 8 is connected to the groove bottom 81 of the receiving groove 8. The central axis of the guide rod 10 is parallel to or coaxial with the central axis of the receiving groove 8. A spring 11 is sleeved on the outside of the guide rod 10 (as shown in FIG. Figure 8 ), one end of which abuts against the bottom 81 of the receiving groove 8, and the other end abuts against the inner wall 41 of the main barrel 4. The length of the guide rod 10 is moderate so that it does not affect the expansion and contraction of the spring 11. The spring 11 is always in a compressed state between the main barrel 4 and the focusing barrel 1. The elastic force generated by the compression generates an internal repulsive force on the focusing barrel 1 towards the end of the focusing barrel 1 ( Figure 7 The inner repulsive force causes the focusing lens barrel 1 and the guide mechanism to always lean toward the left side (side c) in the figure, thereby eliminating the gap between the guide pin 2 and the driving cam 3 on that side.

[0062] It is understandable that, for the above embodiment, the spring 11 can also be kept in a stretched state between the main lens barrel 4 and the focusing lens barrel 1. In this case, the two ends of the spring 11 can be fixedly connected to the bottom 81 of the receiving groove 8 and the inner wall 41 of the main lens barrel 4 respectively. The tension generated by the stretching generates an outward repulsive force on the focusing lens barrel 1 directed toward the focusing lens barrel port 1 ( Figure 7 The focusing lens barrel 1 and the guide mechanism are always supported toward the right side (side d) in the figure, thereby eliminating the gap between the guide pin 2 and the driving cam 3 on that side.

[0063] Figure 9 illustrative structural diagrams of zoom lenses 900 according to some other embodiments of the present invention are shown. Figure 10 Shown Figure 9 An exemplary structural diagram of the repulsive member in FIG.

[0064] like Figure 9 As shown in FIG, zoom lens 900 includes a main barrel 4, a focus barrel 1 sleeved within the main barrel 4, and a focus mechanism including a drive cam 3, a guide pin 2, the focus barrel 1, a guide rod 13, a spring 14, and a plunger 15. The structures of the main barrel 4, the focus barrel 1, the drive cam 3, and the guide pin 2 can be found in the description of the previous embodiment and will not be described in detail here.

[0065] like Figure 9 As shown in , a receiving groove 12 is provided on the focusing lens barrel 1, with the groove opening facing the open side of the main lens barrel 4. A hollow guide rod 13 is located in the receiving groove 12, and the central axis of the guide rod 13 is parallel to or coaxial with the central axis of the receiving groove 12. The guide rod 13 is open at one end and closed at the other end. Its closed end 131 is connected to the groove bottom 121 of the receiving groove 12, and its open end faces the open side of the main lens barrel 4. The spring 14 is embedded in the guide rod 13, with one end abutting against the closed end 121 of the guide rod 13, and the other end abutting against the inner wall 41 of the main lens barrel 4 through a plunger 15 (the spring 14 is connected to the plunger 15) that can slide in the guide rod 13. The spring 14 is always in a compressed state between the main lens barrel 4 and the focusing lens barrel 1, and the elastic force generated by the compression generates an internal repulsive force ( Figure 9 left direction), so that the focusing lens barrel 1 and the guide mechanism are always Figure 9 The left side (e side) in the figure bears against the guide pin 2 and the driving cam 3, thereby eliminating the gap on this side.

[0066] It can be understood that, as a variation of the above embodiment, both ends of the guide rod 13 can be opened (in this case, the side wall of the guide rod can be connected with the side wall of the accommodating groove), and one end of the spring 14 passes through the opening end of one side of the guide rod 13 and abuts against the groove bottom 121 of the accommodating groove 12, and the other end abuts against the inner wall 41 of the main lens barrel 4 through the plunger 15.

[0067] In addition, the spring 14 can always be in a stretched state between the main lens barrel 4 and the focusing lens barrel 1. In this case, when the guide rod 13 is in the structure of one end opening as described in the above embodiment, one end of the spring 14 can be fixedly connected with the closed end 131 of the guide rod 13, and the other end can be connected with the inner wall 41 of the main lens barrel 4 through the plunger 15 (the structure of the plunger 15 and the connection relationship with other components are the same as those in the embodiment shown in the figure).The spring 14 is always in a stretched state between the main lens barrel 4 and the focusing lens barrel 1, and the tension generated by the stretching generates an outward repulsive force (to the right in the figure) on the focusing lens barrel 1, thereby making the focusing lens barrel 1 always bear against the guide mechanism. Figure 9 Figure 9 The right side (f side) in the figure bears against the guide pin 2 and the driving cam 3, thereby eliminating the gap on this side. Figure 9

[0068] It can be understood that, as a variation of the above embodiment, both ends of the guide rod 13 can be opened (in this case, the side wall of the guide rod can be connected with the side wall of the accommodating groove), and one end of the spring 14 passes through the opening end of one side of the guide rod 13 and abuts against the groove bottom 121 of the accommodating groove 12, and the other end abuts against the inner wall 41 of the main lens barrel 4 through the plunger 15.

[0069] It can be understood that, in other embodiments, the plunger can not be provided, and the spring and the guide rod can be used to complete the above functions. For example, for the case where the spring is always in a compressed state, the guide rod can be arranged to be long enough so that the end of the guide rod that extends out of the accommodating groove is close to the inner wall of the main lens barrel, that is, the length of the guide rod is sufficient for the spring to stretch and contract, and in this case, the end of the spring that is close to the inner wall 41 of the main lens barrel can directly abut against the inner wall of the main lens barrel. For the case where the spring is always in a stretched state, the end of the spring that is close to the main lens barrel can be directly connected with the inner wall of the main lens barrel. That is, the connection between the spring and the main lens barrel can be achieved without the aid of the plunger.

[0070] The nested repulsive force member can make the assembly on the zoom lens difficult, and embedding the elastic member (for example, the spring) in the guide rod can increase the protection of the elastic member, prevent damage to the elastic member, and thereby improve the safety level of the elastic member itself.

[0071] ​The nested structure described above may also include a guide rod and the magnetic assembly described above. One end of the guide rod may be connected to the focusing lens barrel. One of the two magnets included in the magnetic assembly may be mounted externally or embedded within the guide rod, while the other of the two magnets may be disposed (e.g., fixedly or removably connected) on a structure opposite the focusing lens barrel. These two structures are described below.

[0072] When the magnet is sleeved outside the guide rod, the guide rod can be set in the receiving groove of the focusing barrel (the arrangement and structure of the receiving groove can be the same as the embodiment described above), and its end located in the receiving groove can be connected to the bottom of the receiving groove, and the other end is not connected to the main barrel (for example, the entire guide rod can be located in the receiving groove or one end of the guide rod extending out of the receiving groove is suspended in the air with a certain gap between it and the inner wall of the main barrel, so as to eliminate the gap between the guide pin and the driving cam). One magnet of the magnetic assembly can have a hole that matches the shape of the guide rod, and it can be fixedly or detachably sleeved on the guide rod through the hole, and the other magnet of the magnetic assembly can be connected to the inner wall of the main barrel (for example Figure 7 The inner wall 41) is fixedly connected or detachably connected.

[0073] For this embodiment, when the two magnets of the magnetic assembly attract each other, the gap between the guide pin and the driving cam can be eliminated (for example, Figure 7 The gap on the d side of the guide pin can be eliminated when the two magnets of the magnetic assembly repel each other (for example, Figure 7 clearance on the middle c side).

[0074] When the magnet is embedded in the guide rod, the guide rod can be a structure with one end open or both ends open, which can be located in the receiving groove of the focusing lens barrel (the arrangement and structure of the receiving groove can be the same as the embodiment described above) and connected thereto, and the connection relationship and arrangement can be the same as Figure 9 The embodiment described above is the same and will not be described in detail here. In this case, one magnet of the magnetic assembly can be fixedly or detachably connected to the inside of the guide rod (such as the inner wall), and the other magnet can be connected to the inner wall of the main barrel (such as Figure 7 and Figure 9 For this embodiment, when the two magnets of the magnetic assembly attract each other, the gap between the guide pin and the driving cam side (for example, Figure 9 The gap on the f side of the guide pin can be eliminated when the two magnets of the magnetic assembly repel each other (for example, Figure 9 clearance on the middle e side).

[0075] According to the description of the above-mentioned multiple embodiments, the present invention directly or indirectly applies elastic force or magnetic force (asymmetric force) to the focusing barrel through the elastic deformation or magnetic action of the repulsive member, thereby eliminating the gap between the guide pin and the focusing assembly. The elimination of the gap prevents the moving lens group from deviating from the unique guide structure, thereby avoiding shaking caused by position changes, making the moving lens group more stable in the tilt direction, and thus eliminating the imaging effect of the shaking of the moving lens group on the optical system. In short, this solution can eliminate the problem of asynchrony (return difference) between the driving mechanism and the moving lens group when the zoom lens changes its movement direction, thereby solving the imaging problem caused by it. In addition, the use of elastic members or magnetic members as repulsive members can buffer the unilateral impact force on the focusing assembly during side adjustment impact, thereby facilitating the stability of the focusing assembly.

[0076] In addition, the common lens backlash elimination structure uses an independent spring mechanism in conjunction with a transmission seat and lens barrel. The main axis of the spring is coaxial with the central axis of the lens. This structure requires that the diameter of the spring must match the diameter of the lens, so only springs of fixed diameter can be used, which makes the spring less applicable. This solution uses independent small elastic parts or magnetic components, which are not limited by the diameter of the lens, thereby reducing the requirements for elastic parts or repulsive parts. Moreover, due to the wide variety of springs available, material costs can be reduced. In addition, this solution applies force to the focusing barrel on one side, making it more compatible with side-adjusting lenses and able to withstand greater external force impacts.

[0077] The present invention also provides a side adjustment mechanism (lens focus and backlash elimination mechanism) comprising a knob, a transmission base, and the focusing mechanism described above in conjunction with various embodiments. The transmission base has a connecting protrusion on the side facing the knob, and the knob has a connecting hole. The knob is inserted into the connecting hole and fits over the outer side of the connecting protrusion. The connecting hole is provided with a slot adapted to accommodate a latch, which secures the knob and transmission base relative to each other. The side adjustment mechanism can be an electrical mechanism, for example, using a motor to drive a cam for focusing.

[0078] Due to the use of the focusing mechanism, the gap between the guide pin 2 and the driving cam 3 can be eliminated, thereby preventing the zoom lens used in the side adjustment mechanism from shaking due to position changes, thereby ensuring imaging quality.

[0079] Although the embodiments of the present application have been shown and described herein, it should be apparent to those skilled in the art that the embodiments are provided by way of example. Many changes, modifications and substitutions can be made by one of ordinary skill in the art without departing from the spirit and scope of the present application. It should be understood that in the process of practicing the present application, various alternatives to the embodiments described herein can be employed. The appended claims are intended to cover such alternatives and equivalents.

Claims

1. A focusing mechanism, comprising a driving mechanism and a focusing assembly, characterized in that : The focusing assembly includes a focusing lens barrel; The driving mechanism includes a guide pin provided on the focusing lens barrel and a driving cam matched with the guide pin; At least one repulsive member is provided on an axial side of the guide pin, wherein the repulsive member provides an inner repulsive force or an outer repulsive force directed toward a port of the focusing barrel to eliminate a gap between the guide pin and the driving cam.

2. The focusing mechanism according to claim 1, wherein: The force-bearing portion of the repulsive member abuts against the focusing assembly.

3. The focusing mechanism according to claim 1, wherein: The guide pin is arranged on one side of the focusing lens barrel.

4. The focusing mechanism according to claim 3, wherein: The driving cam is arranged on the outer side of the focusing lens barrel.

5. The focusing mechanism according to claim 1, wherein: The repulsive member includes an elastic member or a magnetic component.

6. The focusing mechanism according to claim 5, wherein: The elastic member is a spring, and the magnetic assembly includes two magnets that repel or attract each other.

7. The focusing mechanism according to claim 6, wherein: The number of the elastic member or magnetic component is one or more.

8. The focusing mechanism according to claim 6, wherein: The repulsive member is a nested structure, which includes: a guide rod, one end of which is connected to the focusing lens barrel; and The elastic member is sleeved outside the guide rod or embedded in the guide rod; or a guide rod, one end of which is connected to the focusing lens barrel; and The magnetic assembly comprises two magnets, one of which is sleeved outside the guide rod or embedded in the guide rod, and the other of which is arranged on a structure opposite to the focusing lens barrel.

9. The focusing mechanism according to claim 1, wherein: The repulsive force direction of the repulsive member is coaxial with the impact direction of the external force applied to the focusing lens barrel.

10. The focusing mechanism according to claim 1, wherein: The repulsive members are arranged on both axial sides of the guide pin.

11. The focusing mechanism according to claim 1, wherein: The guide pin passes through the main lens barrel sleeved outside the focusing lens barrel and is connected to the focusing lens barrel, and a straight groove is provided between the guide pin and the main lens barrel; The guide nail includes a rod portion and a head portion connected in sequence, the rod portion is inserted into the straight slot, and the head portion cooperates with the driving cam.

12. The focusing mechanism according to claim 11, wherein: The diameter of the head portion is smaller than the diameter of the stem portion.

13. The focusing mechanism according to claim 12, wherein: The rod portion has a polygonal cross section.

14. The focusing mechanism according to claim 13, wherein: The polygonal cross section is a regular hexagonal cross section.

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