Guide nail

Abstract

The utility model discloses a guide nail which is used for driving a focusing lens cone of a focusing mechanism to move through driving of a driving cam so as to realize focusing. The guide nail passes through the main lens cone sleeved outside the focusing lens cone and is connected with the focusing lens cone, and a straight groove is arranged between the guide nail and the main lens cone. The guide nail comprises a rod part and a head part which are connected in sequence, the rod part is inserted into the straight groove, and the head part is matched with the driving cam. According to the scheme, the connection between the guide nail and the main lens barrel and the focusing lens barrel is better.

Description

[0001] This application is a divisional application of Chinese patent application No. 202422770776.3, filed on November 13, 2024, entitled "Focusing Mechanism". Technical Field

[0002] This utility model relates to the field of optical lens technology, and in particular to a guide pin. Background Technology

[0003] In current optical lenses, focusing functionality is typically included to achieve clear imaging of targets at different distances. This focusing function is achieved by axial movement of the focusing lens barrel relative to the main lens barrel. To drive this movement, a drive mechanism is commonly used in existing technologies. This mechanism includes a guide pin mounted on the main lens barrel and a drive cam that engages with the guide pin. The guide pin moves with the focusing lens barrel, and under the action of the drive cam, it drives the focusing lens barrel to move along the optical axis, thus achieving the focusing function.

[0004] However, in existing focusing mechanisms, a gap exists between the guide pin and the drive cam, often causing focusing lag during focusing, 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 lens barrel to vibrate, further impacting image quality. Currently, the connection between the guide pin and the main lens barrel and focusing lens barrel has certain shortcomings.

[0005] Therefore, there is an urgent need to provide a guide pin that is impact-resistant, simple in structure, easy to assemble, low in cost, and has better connection with the main lens barrel and focusing lens barrel. Utility Model Content

[0006] In order to solve at least one or more of the technical problems mentioned above, this utility model proposes a guide pin.

[0007] In a first aspect, the present invention provides a guide pin, which is used to drive the focusing lens barrel to move along the optical axis direction under the action of a drive cam to achieve a focusing function; 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 pin includes a rod and a head connected in sequence, the rod is inserted into the straight groove, and the head cooperates with the drive cam.

[0008] In one embodiment, the bottom of the rod is inserted into the focusing lens barrel.

[0009] In one embodiment, the diameter of the head is smaller than the diameter of the rod.

[0010] In one embodiment, the rod has a polygonal cross-section.

[0011] In one embodiment, the polygonal cross-section is a regular hexagonal cross-section, a regular quadrilateral cross-section, or a regular pentagonal cross-section.

[0012] In one embodiment, the guide pin is integrally formed.

[0013] In a second aspect, the present invention also provides a focusing mechanism, including a driving mechanism and a focusing assembly, the focusing assembly including a focusing lens barrel; the driving mechanism including a guide pin disposed on the focusing lens barrel and a driving cam cooperating with the guide pin; at least one repulsive member is disposed on the axial side of the guide pin, wherein the repulsive member provides an internal repulsive force or an external repulsive force pointing towards the port of the focusing lens barrel to eliminate the gap between the guide pin and the driving cam.

[0014] In one embodiment, the force-receiving part of the repulsive member abuts against the focusing assembly.

[0015] In one embodiment, the guide pin is disposed on one side of the focusing lens barrel.

[0016] In one embodiment, the drive cam is disposed on the outside of the focusing lens barrel.

[0017] In one embodiment, the repulsive element includes an elastic element or a magnetic component.

[0018] In one embodiment, the elastic element is a spring, and the magnetic assembly includes two magnets that repel or attract each other.

[0019] In one embodiment, the number of the elastic element or magnetic component is one or more.

[0020] In one embodiment, the repulsive element is a nested structure, comprising: a guide rod, one end of which is connected to the focusing lens barrel; and an elastic element, which is sleeved outside or embedded in the guide rod; or a guide rod, one end of which is connected to the focusing lens barrel; and a magnetic component, comprising one of two magnets sleeved outside or embedded in the guide rod, and the other of the two magnets disposed on a structure opposite to the focusing lens barrel.

[0021] In one embodiment, the repulsive force direction of the repulsive element is coaxial with the impact direction of the external force on the focusing lens barrel.

[0022] In one embodiment, the repulsive force member is provided on both sides of the guide pin along its axial direction.

[0023] In one embodiment, the guide pin passes through the main lens barrel sleeved outside the focusing lens barrel and connects to the focusing lens barrel, and a straight groove is provided between the guide pin and the main lens barrel; the guide pin includes a rod and a head connected in sequence, the rod is inserted into the straight groove, and the head cooperates with the drive cam.

[0024] In one embodiment, the diameter of the head is smaller than the diameter of the rod.

[0025] In one embodiment, the rod has a polygonal cross-section.

[0026] In one embodiment, the polygonal cross-section is a regular hexagonal cross-section. Through the focusing mechanism provided above, this embodiment of the 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 wobbling caused by position changes. This structure stabilizes the moving lens group in the tilt direction, thus eliminating the impact of moving lens group wobbling on the imaging of the optical system. Therefore, this solution eliminates the problem of asynchronous position (backlash) between the drive mechanism and the moving lens group when the zoom lens changes its direction of movement, thereby solving the imaging problem caused by it. Furthermore, the connection between the guide pin and the main lens barrel and focusing lens barrel in this solution is superior. Attached Figure Description

[0027] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0028] Figure 1 Exemplary structural diagrams of focusing mechanisms according to some embodiments of the present invention are shown;

[0029] Figure 2 A cross-sectional view of a zoom lens according to some embodiments of the present invention is shown;

[0030] Figure 3 The diagram shows a schematic representation of the guide pin structure of some embodiments of the present invention;

[0031] Figure 4 A schematic diagram of the focusing lens barrel is shown when the repulsive component of this utility model includes an elastic component or a magnetic component.

[0032] Figure 5 A schematic diagram of the focusing lens barrel is shown when the repulsive force component of this utility model includes two elastic elements or magnetic components.

[0033] Figure 6An exemplary structural diagram of a zoom lens according to some embodiments of the present invention is shown;

[0034] Figure 7 Exemplary structural diagrams of zoom lenses according to other embodiments of the present invention are shown;

[0035] Figure 8 It shows Figure 7 An exemplary structural diagram of the repulsive element in the diagram;

[0036] Figure 9 An exemplary structural diagram of a zoom lens according to some embodiments of the present invention is shown;

[0037] Figure 10 It shows Figure 9 An exemplary structural diagram of the repulsive element in the diagram. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0039] It should be understood that the terms "comprising" and "including" used in the specification and claims of this utility model indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0040] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this 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 understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0041] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0042] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0043] Figure 1 An exemplary structural diagram of a focusing mechanism 100 according to some embodiments of the present invention is shown. The focusing mechanism 100 of this solution can be applied in a zoom lens.

[0044] like Figure 1 As shown, the focusing mechanism 100 may include a drive mechanism and a focusing assembly. The focusing assembly may include a focusing lens barrel 1. The drive mechanism may include a guide pin 2 disposed on the focusing lens barrel 1 and a drive cam 3 cooperating with the guide pin 2. The guide pin 2 may be disposed on one side of the focusing lens barrel 1, and the drive cam 3 may be disposed on the outside of the focusing lens barrel 1 for driving it. When focusing the lens, the guide pin 2 can be moved by an independent cam mechanism.

[0045] In one embodiment, at least one repulsive element may be provided on the axial side of the guide pin 2. Figure 1 An exemplary embodiment is shown of a repulsive element 4, which 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 towards the port of the focusing lens barrel 1 to eliminate the gap between the guide pin 2 and the drive cam 3. In short, each repulsive element 4 can provide repulsive forces in two directions, thereby eliminating the gap between the guide pin 2 and the drive cam 3 on different sides.

[0046] It is understandable that when the moving lens group (located inside the focusing lens barrel) of a zoom lens is subjected to force, the force direction will be towards one end of the lens. In order to overcome problems such as focusing lens barrel shake caused by external impact, in one embodiment, the repulsive force direction of the repulsive member 4 can be coaxial with the impact direction of the external force on the focusing lens barrel 1. This repulsive force causes mutual repulsion between the moving lens group and its housing body (main lens barrel), thereby subjecting the moving lens group to a unidirectional force pointing towards the front or rear end of the lens, thus eliminating the gap between the drive mechanism and the moving lens group.

[0047] In one or more embodiments, the repulsive element 4 may include an elastic element or a magnetic component. In one application scenario, the elastic element may be a spring, and the magnetic component may be two magnets that repel each other (like pole magnets) or attract each other (opposite pole magnets). Further, the magnets may include, for example, magnets. The elastic element may adopt an encapsulated structure or a separate structure, and the magnetic component may be a separate structure. The assembly difficulty of using a magnetic component is relatively lower than that of an elastic element.

[0048] Depending on the specific requirements, the number of elastic elements or magnetic components can be one or more, such as two, three, or four. When each repulsive element includes one elastic element or magnetic component, the focusing mechanism has a lower cost. When each repulsive element includes multiple elastic elements or magnetic components, these components can be positioned in multiple locations, thereby applying repulsive forces to the guide pin and focusing lens barrel at multiple locations, thus minimizing the gap between the guide pin and the drive cam.

[0049] This invention eliminates the gap between the guide pin and the drive cam by using internal or external repulsive forces generated by the repulsive component, thereby preventing wobbling caused by position changes. This structure stabilizes the moving lens group in the tilt direction, thus eliminating the impact of the moving lens group's wobbling on the optical system's imaging. Therefore, this solution eliminates the problem of asynchronous position (backlash) between the drive mechanism and the moving lens group when the zoom lens changes its direction of movement, thereby resolving the imaging problems caused by this.

[0050] The guide pin and focusing lens barrel can be connected in various ways, as described below. Figure 2 and Figure 3 The connection structure between the guide pin and the focusing lens barrel will be explained. Figure 2 A cross-sectional view of a zoom lens 200 according to some embodiments of the present invention is shown. Figure 3 A schematic diagram of the guide pin structure of some embodiments of the present invention is shown.

[0051] like Figure 2 As shown, the zoom lens 200 may further include a main lens barrel 4, which is sleeved outside the focusing lens barrel 1 and coaxially arranged therewith. A guide pin can pass through the side wall of the main lens barrel 4 and connect to the focusing lens barrel 1, and a straight groove 7 can be provided between the guide pin and the main lens barrel 4. The guide pin includes a rod 22 and a head 21 connected in sequence. The rod 22 is inserted into the straight groove 7, and its bottom is inserted into the focusing lens barrel 1. The head 21 of the guide pin cooperates with the drive cam 3. Figure 2 and Figure 3 As shown, the diameter of the head 21 of the guide pin can be smaller than the diameter of the rod 22. The small head 21 can be adapted to the inner curve cam (drive cam 3) to form a complete solid circle, which makes the guide pin free from the risk of machining defects and highly resistant to impact.

[0052] like Figure 3 As shown, the rod portion 22 of the guide pin can have a polygonal cross-section (for example, the upper portion of the rod portion 22 has a polygonal cross-section), and the polygonal cross-section can be... Figure 3 The hexagonal cross-section shown overcomes the poor impact resistance of existing cylindrical guide pins. Furthermore, the guide pin can be integrally molded, thus meeting the requirements of simple processing and easy disassembly. Besides this shape, the aforementioned polygonal cross-section can also be, for example, a regular quadrilateral or a regular pentagon.

[0053] Regarding the structure of the repulsive element, in one embodiment, the force-receiving portion of the repulsive element can abut against the focusing assembly, thereby applying repulsive force to the focusing assembly and thus applying force to the guide pin to eliminate the gap between it and the drive cam. In one implementation, the force-receiving portion of the repulsive element can abut against the focusing lens barrel. For example, when the repulsive element includes an elastic element, one end of the elastic element can directly abut against the focusing lens barrel, and the other end of the elastic element can abut against the main lens barrel. When the repulsive element includes two magnets, one of the two magnets can directly abut against the focusing lens barrel, and the other of the two magnets can abut against the main lens barrel.

[0054] To protect the repulsive element and prevent damage, a receiving groove can be provided on the focusing lens barrel. An elastic element or a magnet is placed in the receiving groove, and the elastic element or magnet abuts against the bottom of the receiving groove, while the other end of the elastic element or the other magnet abuts against the main lens barrel.

[0055] In one embodiment, the repulsive element can be located on the opposite side of the guide pin, specifically a range directly opposite the guide pin. For example, when the repulsive element includes an elastic member, it can be positioned on the focusing lens barrel at a location directly opposite the guide pin (e.g., a point along the axial direction of the guide pin) or at a location offset from that location. When the repulsive element includes a magnetic component, one magnet can also be positioned on the focusing lens barrel at a location directly opposite the guide pin or at a location offset from that location, while the other magnet can be positioned on the main lens barrel at a location corresponding to the first magnet. Figure 4 This diagram illustrates the structure of the focusing lens barrel 1 when the repulsive force component of this invention includes an elastic element or a magnetic component. For example... Figure 4 As shown, the repulsive element includes an elastic element or a magnet (not shown in the figure) of a magnetic component, which can be disposed in the receiving groove 8 of the focusing lens barrel 1 on the opposite side of the guide pin 2.

[0056] When the repulsive element comprises multiple elastic elements, one of them can be positioned on the focusing lens barrel directly opposite the guide pin, while the others are positioned at a certain offset from that position. Alternatively, they can be arranged with the axis of the guide pin as a reference, for example, on both sides of the guide pin's axis, and arranged symmetrically or asymmetrically with respect to the guide pin's axis. When the repulsive element comprises multiple magnetic components, the multiple magnets (one magnet from each magnetic component) that need to be arranged on the focusing lens barrel can be arranged similarly to the aforementioned multiple elastic elements, while the other multiple magnets of these magnetic components are arranged at corresponding positions on the main lens barrel. Figure 5 This diagram illustrates the structure of the focusing lens barrel 1 when the repulsive force component of this invention includes two elastic elements or magnetic components. Figure 5 As shown, two elastic elements or two magnets (belonging to two magnetic assemblies) are arranged on both sides of the guide pin 2 along the axis and are located in the receiving grooves 91 and 92 of the focusing lens barrel 1, respectively.

[0057] Placing the repulsive element on the opposite side of the guide pin can make full use of the larger space on the opposite side of the guide pin, making it easier to assemble and allowing for a larger lever arm.

[0058] In another embodiment, the repulsive element may also be disposed on the same side of the guide pin, for example, one of the magnets in its elastic element or magnetic assembly may be disposed on the same side of the guide pin. In yet another embodiment, the repulsive element may include multiple elastic elements or magnets that are disposed on the same side and opposite sides of the guide pin, respectively.

[0059] The arrangement of a single repulsive element has been described above. In another embodiment, the focusing mechanism may also include multiple repulsive elements, such as two or three. In this case, repulsive elements can be provided on both sides of the guide pin along its axial direction, and these repulsive elements can be arranged symmetrically or asymmetrically along the axial direction of the guide pin. The arrangement of multiple repulsive elements can be found in the arrangement of multiple elastic elements or multiple magnetic components described above, and will not be detailed here.

[0060] To further illustrate the arrangement and working principle of the repulsive element, which includes only elastic or magnetic components, this utility model will be described below in conjunction with... Figure 5 We will use the structure of a zoom lens to explain it. Figure 6 An exemplary structural diagram of a zoom lens 600 according to some embodiments of the present invention is shown.

[0061] like Figure 6 As shown, the zoom lens 600 includes a main lens barrel 4 and a focusing lens barrel 1 (which can be coaxially arranged) fitted inside the main lens barrel 4. The focusing mechanism includes a drive 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 drive cam 3, and the guide pin 2 can be found in the description of the previous embodiment, and will not be detailed here.

[0062] like Figure 6 As shown, the first magnet 5 is positioned opposite the guide pin 2 and is directly arranged on the side wall (e.g., the outer wall) of the focusing lens barrel 1. The second magnet 6 is arranged on the side wall (e.g., the outer wall) of the main lens barrel 4, corresponding to the position of the first magnet 5. In this embodiment, the side wall of the focusing lens barrel 1 where the first magnet 5 is located and the side wall of the main lens barrel 4 where the second magnet 6 is located are on the same side, thus making the two magnets closer together and exerting a greater force. To increase the force 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 this straight line can be coaxial with the direction of the external force impacting the focusing lens barrel 1. Thus, when the zoom lens 500 is impacted by an external force, the repulsive force on the focusing lens barrel 1 is maximized, thereby minimizing the gap between the guide pin 2 and the drive cam 3 on side a.

[0063] It is understood that the arrangement of the two magnets described above is merely exemplary and not limiting. Those skilled in the art can modify the arrangement of the repulsive element; for example, the first magnet 5 can also be disposed on the end face of the focusing lens barrel 1 opposite to the main lens barrel 4, and the second magnet 6 can be disposed on the corresponding end face of the main lens barrel 4 opposite to the focusing lens barrel 1. Furthermore, receiving grooves for accommodating elastic or magnetic elements can be provided on the focusing lens barrel 1 and / or the main lens barrel 4. For example, the second magnet 6 can be disposed as described above, but the first magnet 5 can be disposed within the receiving groove of the focusing lens barrel 1; or, the first magnet 5 can be disposed as described above, and the second magnet 6 can be disposed within the receiving groove of the main lens barrel 4; or, the first magnet 5 and the second magnet 6 can be disposed within the receiving grooves of the focusing lens barrel 1 and the main lens barrel 4, respectively. When the repulsive element comprises two mutually attracting magnets, this structure can also be used to arrange the two magnets, thereby eliminating the gap between the guide pin 2 and the drive cam 3 on side b by relying on the attraction of the two magnets.

[0064] The above describes the arrangement of the repulsive element when it includes an elastic element or a magnetic component. In other embodiments, the repulsive element can also be a nested structure, which may include a guide rod and the elastic element 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 element can be sleeved outside the guide rod or embedded in the guide rod. To protect the nested repulsive element, it can be installed in the 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, with one end connected to the bottom of the receiving groove.

[0065] To clearly describe the structure, arrangement, and working principle of the nested repulsive force member including the elastic element, this utility model will be described in detail below in conjunction with the structure of a zoom lens. Figure 7 Exemplary structural diagrams of a zoom lens 700 according to other embodiments of the present invention are shown. Figure 8 It shows Figure 7An exemplary structural diagram of the repulsive element in the diagram.

[0066] like Figure 7 As shown, the zoom lens 700 includes a main lens barrel 4, a focusing lens barrel 1 fitted inside the main lens barrel 4, and a focusing mechanism including a drive cam 3, a guide pin 2, the focusing lens barrel 1, a guide rod 10, and a spring 11. The structure of the main lens barrel 4, the focusing lens barrel 1, the drive cam 3, and the guide pin 2 can be found in the description of the previous embodiments, and will not be described in detail here.

[0067] Further as Figure 7 As shown, the focusing lens barrel 1 is provided with a receiving groove 8, the groove opening facing the opening side of the main lens barrel 4. A guide rod 10 is partially located within the receiving groove 8, with its other end extending out of the receiving groove 8. The end of the guide rod 10 located within the receiving groove 8 is connected to the 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 (e.g., ...). Figure 8 As shown in the diagram, one end of the guide rod 10 abuts against the bottom 81 of the receiving groove 8, and the other end abuts against the inner wall 41 of the main lens barrel 4. The length of the guide rod 10 is moderate so as not to affect the extension and retraction of the spring 11. The spring 11 is always in a compressed state between the main lens barrel 4 and the focusing lens barrel 1. The elastic force generated by the compression produces an internal repulsive force on the focusing lens barrel 1 pointing towards the port of the focusing lens barrel 1. Figure 7 (From the center to the left), the internal repulsive force makes the focusing lens barrel 1 and the guide mechanism always rest on the left side (side c) in the figure, thereby eliminating the gap between the guide pin 2 and the drive cam 3 on this side.

[0068] It is understood that, in 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 produces an external repulsive force on the focusing lens barrel 1 pointing towards the focusing lens barrel port 1. Figure 7 (in the direction from the center to the right), so that the focusing lens barrel 1 and the guide mechanism always rest on the right side (d side) in the figure, thereby eliminating the gap between the guide pin 2 and the drive cam 3 on that side.

[0069] Figure 9 An exemplary structural diagram of a zoom lens 900 according to some embodiments of the present invention is shown. Figure 10 It shows Figure 9 An exemplary structural diagram of the repulsive element in the diagram.

[0070] like Figure 9 As shown, the zoom lens 900 includes a main lens barrel 4, a focusing lens barrel 1 fitted inside the main lens barrel 4, and a focusing mechanism including a drive cam 3, a guide pin 2, a focusing lens barrel 1, a guide rod 13, a spring 14, and a plunger 15. The structure of the main lens barrel 4, the focusing lens 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.

[0071] like Figure 9 As shown, the focusing lens barrel 1 is provided with a receiving groove 12, the groove opening facing the opening side of the main lens barrel 4. A hollow guide rod 13 is located inside the receiving groove 12, and the central axis of the guide rod 13 is parallel or coaxial with the central axis of the receiving groove 12. One end of the guide rod 13 is open, and the other end is closed. Its closed end 131 is connected to the bottom 121 of the receiving groove 12, and its open end faces the opening side of the main lens barrel 4. A spring 14 is embedded in the guide rod 13. One end of the spring 14 abuts against the closed end 121 of the guide rod 13, and the other end abuts 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 inside 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. The elastic force generated by the compression produces an internal repulsive force on the focusing lens barrel 1 pointing towards the port of the focusing lens barrel 1. Figure 9 (From center to left), so that the focusing lens tube 1 and the guide mechanism are always aligned. Figure 9 The left side (e side) of the guide pin 2 and the drive cam 3 are supported, thereby eliminating the gap on that side.

[0072] It is understood that, as a variation of the above embodiment, both ends of the guide rod 13 can be open (at this time, the side wall of the guide rod can be connected to the side wall of the receiving groove). At this time, one end of the spring 14 passes through the open end of the guide rod 13 and abuts against the bottom 121 of the receiving groove 12, and the other end abuts against the inner wall 41 of the main lens barrel 4 through the plunger 15.

[0073] Furthermore, the spring 14 can be kept in a stretched state between the main lens barrel 4 and the focusing lens barrel 1. In this case, when the guide rod 13 has the one-end open structure described in the above embodiment, one end of the spring 14 can be fixedly connected to the closed end 131 of the guide rod 13, and the other end can be connected via the plunger 15 (the structure of the plunger 15 and its connection with other components are similar to...). Figure 9 (The embodiment shown is the same) is connected to the inner wall 41 of the main lens barrel 4. 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 produces an outward repulsive force on the focusing lens barrel 1 pointing towards the port of the focusing lens barrel 1. Figure 9 (in the direction of center to right), so that the focusing lens tube 1 and the guide mechanism are always aligned. Figure 9 The right side (f side) of the guide pin 2 and the drive cam 3 are supported, thereby eliminating the gap on that side.

[0074] It is understood that, as a variation of the above embodiment, both ends of the guide rod 13 can be open (at this time, the side wall of the guide rod can be connected to the side wall of the receiving groove), one end of the spring 14 passes through the open end of the guide rod 13 and is connected to the bottom 121 of the receiving groove 12, and the other end is connected to the inner wall 41 of the main lens barrel 4 through the plunger 15.

[0075] It is understandable that in some embodiments, the plunger may not be required, and the above functions can be accomplished solely by the spring and guide rod. For example, when the spring is always in a compressed state, the guide rod can be made long enough so that one end extending from the receiving groove is close to the inner wall of the main lens barrel, i.e., the length of the guide rod is sufficient for the spring to extend and retract. In this case, the end of the spring near the inner wall 41 of the main lens barrel can directly abut against the inner wall of the main lens barrel. When the spring is always in a stretched state, the end of the spring near the main lens barrel can be directly connected to 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 a plunger.

[0076] Using nested repulsive components makes assembly on zoom lenses easier, and embedding elastic components within guide rods increases the protection of elastic components (such as springs), preventing damage and thus improving the safety level of the elastic components themselves.

[0077] The aforementioned nested structure may also include a guide rod and the magnetic assembly described above. One end of the guide rod can be connected to the focusing lens barrel. One of the two magnets in the magnetic assembly can be sleeved outside or embedded in the guide rod, while the other of the two magnets can be disposed (e.g., fixedly or detachably connected) on a structure opposite to the focusing lens barrel. These two structures are described below.

[0078] When the magnet is sleeved outside the guide rod, the guide rod can be positioned within the receiving groove of the focusing lens barrel (the arrangement and structure of the receiving groove can be the same as in the embodiment described above). One end of the guide rod located within the receiving groove can be connected to the bottom of the receiving groove, while the other end is not connected to the main lens barrel (e.g., the entire guide rod can be entirely located within the receiving groove, or the end of the guide rod extending out of the receiving groove can be suspended with a certain gap between it and the inner wall of the main lens barrel, in order to eliminate the gap between the guide pin and the drive cam). One magnet of the magnetic assembly can have a hole matching the shape of the guide rod, through which it can be fixedly or detachably sleeved onto the guide rod. The other magnet of the magnetic assembly can be connected to the inner wall of the main lens barrel (e.g., Figure 7 41) Fixed or detachable connection to the inner wall of the middle.

[0079] In this embodiment, when the two magnets of the magnetic assembly attract each other, the gap between the guide pin and the drive cam side can be eliminated (e.g., Figure 7 The gap on the d-side), while when the two magnets of the magnetic assembly repel each other, the gap on the other side of the guide pin and the drive cam can be eliminated (e.g., the gap on the d-side). Figure 7 (The gap on the c-side).

[0080] When the magnet is embedded in the guide rod, the guide rod can be an open-end or open-end structure. It can be located in and connected to the receiving groove of the focusing lens barrel (the arrangement and structure of the receiving groove can be the same as in the embodiment described above). The connection relationship and arrangement can be the same as... Figure 9The embodiments described above are the same and will not be detailed here. In this case, one magnet of the magnetic assembly can be fixedly or detachably connected to the inside of the guide rod (e.g., on the inner wall), and the other magnet can be connected to the inner wall of the main lens barrel (e.g., on the inner wall). Figure 7 and Figure 9 The inner wall 41) is fixedly or detachably connected. In this embodiment, when the two magnets of the magnetic assembly attract each other, the gap between the guide pin and the drive cam side can be eliminated (e.g., Figure 9 The gap on the middle f side), while when the two magnets of the magnetic assembly repel each other, the gap on the other side of the guide pin and the drive cam can be eliminated (e.g., the gap on the middle f side). Figure 9 (The gap on the middle e side).

[0081] As described in the above embodiments, this invention uses the elastic deformation or magnetic force of the repulsive element to directly or indirectly apply elastic or magnetic (asymmetric force) to the focusing lens barrel, thereby eliminating the gap between the guide pin and the focusing assembly. This elimination of the gap prevents the moving lens group from deviating from the single guiding structure, thus avoiding wobbling caused by positional changes. This makes the moving lens group more stable in the tilt direction, thereby eliminating the impact of the moving lens group's wobbling on the optical system's imaging. In short, this solution eliminates the problem of asynchronous position (backlash) between the drive mechanism and the moving lens group when the zoom lens changes its direction of movement, thus solving the imaging problem caused by this. Furthermore, using an elastic or magnetic element as a repulsive element can buffer the unilateral impact force on the focusing assembly during side-adjustment, thus contributing to the stability of the focusing assembly.

[0082] Furthermore, common lens backlash elimination mechanisms employ independent spring mechanisms in conjunction with the drive mount and lens barrel. The spring's main axis is coaxial with the lens's central axis. This structure requires the spring's diameter to match the lens's diameter, limiting the use of fixed-diameter springs and thus limiting spring versatility. This solution utilizes independent small elastic components or magnetic components, which are not limited by lens diameter, reducing the requirements for elastic or repulsive components. Moreover, the wider variety of springs available reduces material costs. Additionally, this solution applies force to one side of the focusing lens barrel, resulting in a higher compatibility with side-adjusting lenses and the ability to withstand greater external impacts.

[0083] This utility model also provides a side adjustment mechanism (lens focusing and anti-free return mechanism), which includes a knob, a transmission base, and the focusing mechanism described above in conjunction with several embodiments. The transmission base has a connecting protrusion on the side facing the knob, and the knob has a connecting hole. The knob is fitted onto the outside of the connecting protrusion through the connecting hole. The connecting hole has a slot adapted for locking, and the knob and the transmission base are fixed relative to each other through the slot. This side adjustment mechanism can be an electronically adjustable mechanism, for example, focusing via a motor driving a drive cam.

[0084] The use of the focusing mechanism eliminates the gap between the guide pin 2 and the drive cam 3, thereby preventing the zoom lens used in the side adjustment mechanism from shaking due to position changes and ensuring image quality.

[0085] While various embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A guide pin, characterized in that, The guide pin is used to drive the focusing lens barrel to move along the optical axis under the action of the drive cam, so as to realize the focusing function; the guide pin passes through the main lens barrel sleeved outside the focusing lens barrel and connects to the focusing lens barrel, and a straight groove is provided between the guide pin and the main lens barrel; The guide pin includes a rod and a head connected in sequence. The rod is inserted into the straight groove, and the head cooperates with the drive cam.

2. The guide pin as described in claim 1, characterized in that, The bottom of the rod is inserted into the focusing lens barrel.

3. The guide pin as described in any one of claims 1-2, characterized in that, The diameter of the head is smaller than the diameter of the rod.

4. The guide pin as described in any one of claims 1-2, characterized in that, The rod has a polygonal cross-section.

5. The guide pin as described in claim 4, characterized in that, The polygonal cross-section is a regular hexagonal cross-section, a regular quadrilateral cross-section, or a regular pentagonal cross-section.

6. The guide pin as described in any one of claims 1-2, characterized in that, The guide pin is integrally formed.

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