Aperture adjusting device of a lens and lens

Abstract

The application discloses a diaphragm adjusting device of a lens and the lens. The lens comprises a main barrel and two groups of components movably arranged in the main barrel. The two groups of components are provided with a first clearance groove extending along the circumferential direction of the two groups of components. The diaphragm adjusting device comprises: a diaphragm assembly assembled with the two groups of components, the diaphragm assembly extending out a cam plate used for adjusting the size of a diaphragm hole in the diaphragm assembly; a diaphragm extension ring comprising a connecting rod part and a ring part, the rod part penetrating through the first clearance groove and being movably connected with the cam plate through a limiting groove on the rod part, so that the cam plate can move in the moving direction of the two groups of components in the limiting groove; the ring part is rotatably sleeved in the main barrel; and a limiting structure connected with the diaphragm extension ring and the main barrel is used for limiting the diaphragm extension ring to move on the main barrel in the moving direction of the two groups of components. The application can solve the problem of easily damaging structural components.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and in particular to a lens aperture adjustment device and a lens. Background Technology

[0002] In conventional lenses with large focusing ranges, the aperture adjustment mechanism is usually designed to extend the aperture assembly's movement and incorporate it into the lens group, moving with the lens's focusing. However, when the lens's optical rear focal length is shorter than its flange distance (causing the group to protrude from the interface) and the focusing movement is large, this conventional aperture adjustment mechanism will also protrude along with the group, affecting the lens's aesthetics and potentially damaging structural components. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a lens aperture adjustment device and lens, which can solve the problem of easy damage to structural components.

[0004] In a first aspect, embodiments of the present invention provide an aperture adjustment device for a lens, the lens including a main barrel and two groups movably disposed in the main barrel, the two groups being provided with a first clearance groove extending circumferentially along the two groups, the aperture adjustment device comprising:

[0005] An aperture assembly, assembled with the two groups, the aperture assembly extending out a cam plate for adjusting the size of the aperture hole in the aperture assembly;

[0006] An aperture extension ring includes a connecting rod and a ring. The rod passes through the first clearance groove and is movably connected to the cam plate through a limiting groove on the rod, so that the cam plate can move in the limiting groove along the two groups of moving directions; the ring is rotatably sleeved in the main cylinder.

[0007] A limiting structure, connected to the aperture extension ring and the main cylinder, is used to restrict the aperture extension ring from moving along the two groups of moving directions on the main cylinder.

[0008] According to the first aspect of the present invention, the aperture adjustment device of the lens has at least the following technical effects:

[0009] This invention includes a main cylinder and two groups movably disposed within the main cylinder. Each group has a first clearance groove extending circumferentially along its secondary axis. The first clearance groove is used to prevent the aperture extension ring from obstructing the path, thus preventing structural interference. An aperture assembly is assembled with the two groups. The aperture assembly extends a cam plate for adjusting the size of the aperture aperture within the aperture assembly. The aperture extension ring includes a connecting rod and a ring. The rod passes through the first clearance groove and is movably connected to the cam plate via a limiting groove on the rod, allowing the cam plate to move within the limiting groove along the moving direction of the two groups. The ring is movable... The aperture extension ring is rotatably fitted inside the main barrel. Although the two groups move up and down during focusing, causing the aperture assembly to move, the rod of the aperture extension ring passes through the first clearance groove and is movably connected to the cam plate through the limiting groove on the rod. The aperture extension ring drives the cam plate to rotate through the limiting groove to adjust the aperture size. However, the ring of the aperture extension ring is rotatably fitted inside the main barrel, and the limiting structure restricts the movement of the aperture extension ring on the main barrel along the movement direction of the two groups. Therefore, the aperture extension ring does not participate in the movement of the lens during focusing and will not damage the structural components.

[0010] According to some embodiments of the present invention, the ring portion is sleeved on the inner side of the main cylinder, and the aperture adjustment device further includes an aperture adjustment cylinder, which is connected to the aperture extension ring and sleeved on the outer side of the main cylinder.

[0011] According to some embodiments of the present invention, the limiting structure includes a lever, a first assembly hole provided on the aperture adjustment cylinder, a second assembly hole provided on the rod portion, and a rotation limiting groove provided on the main cylinder extending circumferentially along the main cylinder. One end of the lever passes through the first assembly hole, the rotation limiting groove, and the second assembly hole in sequence, and the lever can move circumferentially along the main cylinder in the rotation limiting groove.

[0012] According to some embodiments of the present invention, the limiting structure further includes an interface and a first step disposed on the inner side of the main cylinder. The interface is fixedly connected to one side of the main cylinder by screws, and the aperture extension ring is located between the first step and the interface and is in clearance fit with the interface.

[0013] According to some embodiments of the present invention, the aperture adjustment cylinder is located between the second step disposed on the outside of the main cylinder and the interface and is in clearance fit with the interface.

[0014] According to some embodiments of the present invention, the cam plate includes a first plate portion parallel to the two ports of the main cylinder and a second plate portion perpendicular to the two ports of the main cylinder, wherein the first plate portion and the second plate portion are connected in a figure-7 shape, and the second plate portion is engaged with the limiting groove.

[0015] According to some embodiments of the present invention, the engagement length between the second plate portion and the limiting groove is greater than the maximum relative movement length between the main cylinder and the two groups.

[0016] According to some embodiments of the present invention, the end of the cam plate that contacts the limiting groove is provided with a first rounded corner, and the end of the limiting groove that is close to the ring is provided with a second rounded corner, wherein the first rounded corner and the second rounded corner cooperate.

[0017] According to some embodiments of the present invention, the lens further includes a group, the group being connected to the end of the main barrel away from the second group, the group being provided with a second clearance groove, and the rod extending toward the group into the second clearance groove.

[0018] Secondly, embodiments of the present invention also provide a lens, wherein the lens is provided with the aperture adjustment device described above.

[0019] The aperture adjustment device according to a second aspect embodiment of the present invention has at least the following technical effects:

[0020] The lens of this invention includes a main barrel and two groups movably disposed within the main barrel. The two groups are provided with a first clearance groove extending circumferentially along the two groups. The first clearance groove is used to prevent the aperture extension ring from obstructing the view, thus preventing structural interference. An aperture assembly is assembled with the two groups. The aperture assembly extends a cam plate for adjusting the size of the aperture aperture in the aperture assembly. The aperture extension ring includes a connecting rod and a ring. The rod passes through the first clearance groove and is movably connected to the cam plate through a limiting groove on the rod, so that the cam plate can move within the limiting groove along the moving direction of the two groups. The aperture extension ring is rotatably fitted inside the main barrel. Although the two groups move up and down during focusing, causing the aperture assembly to move, the rod of the aperture extension ring passes through the first clearance groove and is movably connected to the cam plate through the limiting groove on the rod. The aperture extension ring drives the cam plate to rotate through the limiting groove to adjust the aperture size. However, the ring of the aperture extension ring is rotatably fitted inside the main barrel, and the limiting structure restricts the movement of the aperture extension ring on the main barrel along the movement direction of the two groups. Therefore, the aperture extension ring does not participate in the movement of the lens during focusing and will not damage the structural components. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is an exploded view of a lens component according to an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of the lens focusing process according to an embodiment of the present invention;

[0024] Figure 3This is an assembly diagram of the aperture extension ring according to an embodiment of the present invention;

[0025] Figure 4 This is a three-dimensional schematic diagram of an aperture assembly according to an embodiment of the present invention;

[0026] Figure 5 This is an assembly diagram of a two-group aperture assembly according to an embodiment of the present invention;

[0027] Figure 6 This is a group of three-dimensional schematic diagrams of an embodiment of the present invention;

[0028] Figure 7 This is an assembly diagram of the main tube and the aperture extension ring according to an embodiment of the present invention;

[0029] Figure 8 This is an assembly diagram of the aperture adjustment and lever according to an embodiment of the present invention;

[0030] Figure 9 This is an interface assembly diagram according to an embodiment of the present invention;

[0031] Figure 10 This is a structural assembly diagram of focusing according to an embodiment of the present invention;

[0032] Label Explanation:

[0033] 110. Fixed cylinder; 120. Focusing cylinder; 130. CAM cylinder; 131. Curved groove; 140. Group 1; 141. Second clearance groove; 142. Second positioning hole; 150. Main cylinder; 151. First step; 152. Second step; 153. Straight groove; 154. Rotation limit groove; 160. Aperture assembly; 161. Cam plate; 162. First rounded corner; 163. First plate section; 164. Second plate section; 170, second group; 171, first clearance groove; 172, first positioning hole; 180, aperture extension ring; 181, rod section; 182, ring section; 183, limiting groove; 184, second assembly hole; 185, second rounded corner; 186, assembly countersunk hole; 190, aperture adjustment cylinder; 191, first assembly hole; 200, interface; 210, transmission pin; 220, lever; 230, screw. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of this invention, the use of terms such as "first," "second," etc., is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0036] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0038] In conventional lenses with large focusing ranges, the aperture adjustment mechanism is usually designed to extend the aperture assembly's movement and incorporate it into the lens group, moving with the lens's focusing. However, when the lens's optical rear focal length is shorter than its flange distance (causing the group to protrude from the interface) and the focusing movement is large, this conventional aperture adjustment mechanism will also protrude along with the group, affecting the lens's aesthetics and potentially damaging structural components.

[0039] To solve the above problems, the lens of the present invention includes a main barrel 150 and two groups 170 movably disposed in the main barrel 150. The two groups 170 are provided with a first clearance groove 171 extending circumferentially along the two groups 170. The first clearance groove 171 is used to clear the aperture extension ring 180, preventing structural interference. An aperture assembly 160 is assembled with the two groups 170. The aperture assembly 160 extends a cam plate for adjusting the size of the aperture aperture in the aperture assembly 160. The aperture extension ring 180 includes a connecting rod portion 181 and a ring portion 182. The rod portion 181 passes through the first clearance groove 171 and is movably connected to the cam plate through a limiting groove 183 on the rod portion 181, so that the cam plate can move along the two groups 170 in the limiting groove 183. The ring 182 is rotatably fitted in the main barrel 150. Although the second group 170 moves up and down during focusing, causing the aperture assembly 160 to move, the rod 181 of the aperture extension ring 180 passes through the first clearance groove 171 and is movably connected to the cam plate through the limiting groove 183 on the rod 181. The aperture extension ring 180 drives the cam plate to rotate through the limiting groove 183 to adjust the aperture size. However, the ring 182 of the aperture extension ring 180 is rotatably fitted in the main barrel 150, and the limiting structure restricts the movement of the aperture extension ring 180 on the main barrel 150 along the moving direction of the second group 170. Therefore, the aperture extension ring 180 does not participate in the movement of the lens focusing and will not damage the structural components.

[0040] Reference Figures 1 to 10 This invention provides an aperture adjustment device for a lens. The lens includes a main barrel 150 and two groups 170 movably disposed within the main barrel 150. The two groups 170 are provided with a first clearance groove 171 extending circumferentially along the two groups 170. The aperture adjustment device includes:

[0041] Aperture assembly 160 is assembled with two groups 170, and aperture assembly 160 extends a cam plate for adjusting the size of the aperture hole in aperture assembly 160;

[0042] The aperture extension ring 180 includes a connecting rod portion 181 and a ring portion 182. The rod portion 181 passes through the first clearance groove 171 and is movably connected to the cam plate through the limiting groove 183 on the rod portion 181, so that the cam plate can move in the limiting groove 183 along the moving direction of the second group 170. The ring portion 182 is rotatably sleeved in the main cylinder 150.

[0043] The limiting structure, connected to the aperture extension ring 180 and the main cylinder 150, is used to limit the movement of the aperture extension ring 180 on the main cylinder 150 along the moving direction of the second group 170.

[0044] In this embodiment, the lens includes a main barrel 150 and two groups 170 movably disposed within the main barrel 150. The two groups 170 are provided with a first clearance groove 171 extending circumferentially along the two groups 170, which prevents the aperture extension ring 180 from being obstructed, thus preventing structural interference. An aperture assembly 160 is assembled with the two groups 170. The aperture assembly 160 extends a cam plate for adjusting the size of the aperture aperture in the aperture assembly 160. The aperture extension ring 180 includes a connecting rod portion 181 and a ring portion 182. The rod portion 181 passes through the first clearance groove 171 and is movably connected to the cam plate through a limiting groove 183 on the rod portion 181, so that the cam plate can move along the two groups 170 within the limiting groove 183. The aperture extension ring 180 moves in the direction of movement. The ring 182 is rotatably fitted in the main barrel 150. Although the second group 170 moves up and down during focusing, causing the aperture assembly 160 to move, the rod 181 of the aperture extension ring 180 passes through the first clearance groove 171 and is movably connected to the cam plate through the limiting groove 183 on the rod 181. The aperture extension ring 180 drives the cam plate to rotate through the limiting groove 183 to adjust the aperture size. However, the ring 182 of the aperture extension ring 180 is rotatably fitted in the main barrel 150, and the limiting structure restricts the movement of the aperture extension ring 180 on the main barrel 150 along the moving direction of the second group 170. Therefore, the aperture extension ring 180 does not participate in the movement of lens focusing and will not damage the structural components.

[0045] In some embodiments, the ring portion 182 is sleeved on the inner side of the main cylinder 150, and the aperture adjustment device further includes an aperture adjustment cylinder 190, which is connected to the aperture extension ring 180 and sleeved on the outer side of the main cylinder 150.

[0046] In this embodiment, the aperture adjustment cylinder 190 and the aperture extension ring 180 are connected. The aperture adjustment cylinder 190 drives the aperture extension ring 180 to rotate, thereby adjusting the size of the aperture.

[0047] In some embodiments, the limiting structure includes a lever 220, a first assembly hole 191 provided on the aperture adjustment cylinder 190, a second assembly hole 184 provided on the rod portion 181, and a rotation limiting groove 154 provided on the main cylinder 150 extending circumferentially along the main cylinder 150. One end of the lever 220 passes through the first assembly hole 191, the rotation limiting groove 154, and the second assembly hole 184 in sequence, and the lever 220 can move circumferentially along the main cylinder 150 in the rotation limiting groove 154.

[0048] In this embodiment, the aperture adjustment cylinder 190, the main cylinder 150, and the aperture extension ring 180 are connected together by passing the lever 220 through the first assembly hole 191, the rotation limiting groove 154, and the second assembly hole 184. Rotating the aperture adjustment cylinder 190 drives the aperture extension ring 180 to move circumferentially along the main cylinder 150 in the rotation limiting groove 154 via the lever 220, thereby controlling the maximum and minimum aperture of the aperture.

[0049] In some embodiments, the limiting structure further includes an interface 200 and a first step 151 disposed on the inner side of the main cylinder 150. The interface 200 is fixedly connected to one side of the main cylinder 150 by a screw 230. The aperture extension ring 180 is located between the first step 151 and the interface 200 and is in clearance fit with the interface 200.

[0050] In this embodiment, the position of the aperture extension ring 180 is fixed by the interface 200 and the first step 151 to prevent the aperture extension ring 180 from moving up and down. The aperture extension ring 180 and the interface 200 are fitted with a gap to ensure that the aperture extension ring 180 operates smoothly.

[0051] In some embodiments, the aperture adjustment cylinder 190 is located between the second step 152 disposed on the outside of the main cylinder 150 and the interface 200 and is clearance-fitted with the interface 200.

[0052] In this embodiment, the position of the aperture adjustment cylinder 190 is fixed by the interface 200 and the second step 152 to prevent the aperture adjustment cylinder 190 from moving up and down. The aperture adjustment cylinder 190 and the interface 200 are fitted with a gap to ensure that the aperture adjustment cylinder 190 can operate smoothly.

[0053] In some embodiments, the cam plate includes a first plate portion 163 parallel to the two ports of the main cylinder 150 and a second plate portion 164 perpendicular to the two ports of the main cylinder 150. The first plate portion 163 and the second plate portion 164 are connected in a figure-7 shape, wherein the second plate portion 164 is engaged with the limiting groove 183.

[0054] In this embodiment, the first plate portion 163 and the second plate portion 164 are connected in a figure-7 shape, and the second plate portion 164 is connected to the limiting groove 183, so that when the aperture assembly 160 moves up and down with the two groups 170, the aperture extension ring 180 will not move with it, only the second plate portion 164 and the limiting groove 183 move relative to each other, so as not to damage the structural components.

[0055] In some embodiments, the engagement length between the second plate portion 164 and the limiting groove 183 is greater than the maximum relative movement length between the main cylinder 150 and the second group 170.

[0056] In this embodiment, the engagement length between the second plate portion 164 and the limiting groove 183 is greater than the maximum relative movement length between the main barrel 150 and the second group 170, so that the aperture extension ring 180 and the aperture assembly 160 can operate smoothly without affecting lens focusing.

[0057] In some embodiments, the end of the cam plate that contacts the limiting groove 183 is provided with a first rounded corner 162, and the end of the limiting groove 183 near the ring portion 182 is provided with a second rounded corner 185, and the first rounded corner 162 and the second rounded corner 185 cooperate.

[0058] In this embodiment, the end of the cam plate that contacts the limiting groove 183 is provided with a first rounded corner 162, and the end of the limiting groove 183 that is close to the ring 182 is provided with a second rounded corner 185. The rounded corners can prevent structural interference between the cam plate and the limiting groove 183.

[0059] In some embodiments, the lens further includes a group 140, which is connected to the end of the main tube 150 away from the second group 170. A second clearance groove 141 is provided on the group 140, and the rod 181 extends toward the group 140 into the second clearance groove 141.

[0060] In this embodiment, a second clearance groove 141 is provided on a group 140 to clear the aperture extension ring 180 and prevent structural interference during focusing.

[0061] This invention also provides a lens, which is equipped with the aforementioned lens aperture adjustment device.

[0062] Specifically, refer to Figure 1 The main structure of the lens includes: a fixed tube 110, a focusing tube 120, a CAM tube 130, a first group 140, a transmission PIN 210, a main tube 150, an aperture assembly 160, a second group 170, an aperture extension ring 180, an aperture adjustment tube 190, an interface 200, and a lever 220.

[0063] Reference Figure 2This embodiment is applicable to aperture adjustment of lenses with large movement. Aperture assembly 160 is assembled in the second group 170, and lever 220 is assembled in aperture adjustment cylinder 190. Aperture assembly 160 extends to a cam plate for adjusting the size of the aperture hole in aperture assembly 160. Aperture extension ring 180 is assembled and fixed in the main cylinder 150. Aperture extension ring 180 includes a connecting rod portion 181 and a ring portion 182. Rod portion 181 passes through a first clearance groove 171 and is movably connected to the cam plate through a limiting groove 183 on rod portion 181, so that the cam plate can move in the limiting groove 183 along the moving direction of the second group 170. Cam plate includes a first plate portion 163 parallel to the two ports of the main cylinder 150 and a second plate portion 164 perpendicular to the two ports of the main cylinder 150. The first plate portion 163 and the second plate portion 164 are connected in a "7" shape, wherein the second plate portion 164 is engaged with the limiting groove 183. The interface 200 is assembled and fixed to the main cylinder 150 by screws 230, which can simultaneously fix the positions of the aperture extension ring 180 and the aperture adjustment cylinder 190. The limiting structure includes a lever 220, a first assembly hole 191 on the aperture adjustment cylinder 190, a second assembly hole 184 on the lever 181, and a rotation limiting groove 154 extending circumferentially along the main cylinder 150. One end of the lever 220 passes through the first assembly hole 191, the rotation limiting groove 154, and the second assembly hole 184 in sequence, and the lever 220 can move circumferentially along the main cylinder 150 in the rotation limiting groove 154. By rotating the aperture adjustment cylinder 190, the lever 220 drives the aperture extension ring 180 to adjust the aperture diameter. When the lens needs to be focused, rotating the focusing cylinder 120 drives the CAM cylinder 130. The transmission pin 210 in the CAM cylinder 130 drives the first group 140 and the second group 170 to move a large amount of focus along their respective curved grooves 131. The second plate 164 of the aperture assembly 160 always maintains a mating surface with the aperture extension ring 180, so that the aperture adjustment mechanism always operates smoothly when the lens is focused.

[0064] Reference Figure 3 The aperture extension ring 180 includes a rod portion 181, a ring portion 182, and a screw 230. The rod portion 181 mates with the mounting countersunk holes 186 of the ring portion 182 on all four sides, and is then connected by the screw 230, ensuring a stable structure. The limiting groove 183 in the rod portion 181 is used to mate with the second plate portion 164 of the aperture assembly 160, and the mating length is greater than the maximum movement of the straight groove 153 of the main cylinder 150 (i.e., the maximum relative movement length between the main cylinder 150 and the second group 170 or the first group 140). The second assembly hole 184 in the rod portion 181 is used to connect with a lever 220, which drives the aperture extension ring 180 to rotate along the central axis of the ring portion 182.

[0065] Reference Figure 4The aperture assembly 160 can adjust the aperture size by rotating the cam plate. The cam plate is relatively thick, which makes the aperture assembly 160 less prone to deformation when it is in operation. The second plate portion 164 of the cam plate can increase the amount of movement and engagement with the aperture extension ring 180. The rounded corner at the end of the cam plate can prevent interference with the rounded corner engagement with the limiting groove 183 of the rod portion 181.

[0066] Reference Figure 5 The interior of group 170 is used for assembling lenses. Group 170 has three first positioning holes 172 distributed at 120° on its sidewall. A tap is provided at the center of the recess in each first positioning hole 172 for assembling the drive PIN 210. The front end of group 170 is used for assembling the aperture assembly 160. A clearance groove prevents structural interference during aperture assembly 160 assembly and does not reduce the complete circle of the mating surface between group 170 and main tube 150, preventing tilting during assembly and improving imaging performance.

[0067] Reference Figure 6 The internal assembly of group 140 is used for assembling lenses. Group 140 has three second positioning holes 142 distributed at 120° on its sidewall. A tap is provided at the center of the recess in each second positioning hole 142 for assembling the transmission PIN 210. Group 140 has a clearance groove at its rear end to prevent the aperture extension ring 180 from being obstructed, thus preventing structural interference during focusing and ensuring the complete circle of the mating surface between group 140 and the main tube 150 is maintained. This prevents tilting during assembly of group 140, which is beneficial for imaging performance.

[0068] Reference Figure 7 The main tube 150 has three straight grooves 153 distributed at 120° on its side wall, which are used to guide the transmission PIN 210 and limit the movement of the lens. The tail end of the main tube 150 is provided with a step and a rotation limiting groove 154. The step is used to assemble and limit the engagement of the aperture extension ring 180, and the rotation limiting groove 154 is used to limit the range of movement angle of the lever 220, thereby controlling the maximum and minimum aperture of the aperture.

[0069] Reference Figure 8 After the main tube 150 and the aperture extension ring 180 are assembled, the aperture adjustment tube 190 is assembled on the outside of the main tube 150, and then the entire structure is connected using the lever 220. The thread of the lever 220 is locked with the aperture adjustment tube 190, and the outer diameter of the lever 220 is engaged with the second assembly hole 184 on the aperture extension ring 180. After assembly, the aperture adjustment tube 190 can be rotated to adjust the size of the aperture.

[0070] Reference Figure 9The interface 200 is assembled and fixed to the main tube 150 in the lens by screws 230, and can simultaneously fix the position of the aperture extension ring 180 and the aperture adjustment tube 190. The interface 200, the aperture extension ring 180, and the aperture adjustment tube 190 are in clearance fit, so that the aperture adjustment structure group can operate smoothly.

[0071] Reference Figure 10 Group 140, Group 2 170, and CAM tube 130 are connected in series and assembled on the main tube 150 via six sets of drive pins 210. The side wall of CAM tube 130 has two sets of three identical 120° evenly distributed curved grooves 131. The drive pins 210 can drive Group 140 and Group 2 170 to move along their respective curved grooves 131, enabling precise lens focusing. After assembly, focusing tube 120 is assembled outside CAM tube 130, and then fixing tube 110 is assembled to fix and limit the entire focusing structure.

[0072] In this embodiment, the aperture adjustment structure (which includes an aperture extension ring 180 and an aperture adjustment tube 190) is fixed to the main tube 150 and does not participate in the lens focusing movement. Even with large movements, the aperture adjustment structure can always operate smoothly without structural interference or affecting the aesthetic appearance.

[0073] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A lens aperture adjustment device, characterized in that, The lens includes a main tube and two groups movably disposed within the main tube. The two groups are provided with a first clearance groove extending circumferentially along the two groups. The lens also includes a first group connected to the end of the main tube away from the two groups. This first group is provided with a second clearance groove. The aperture adjustment device includes: An aperture assembly, assembled with the two groups, the aperture assembly extending out a cam plate for adjusting the size of the aperture hole in the aperture assembly; An aperture extension ring includes a connecting rod and a ring. The rod passes through the first clearance groove and is movably connected to the cam plate through a limiting groove on the rod, so that the cam plate can move in the limiting groove along the two groups of moving directions. The rod extends towards the first group into the second clearance groove. The ring is rotatably sleeved in the main cylinder. The ring is sleeved on the inner side of the main cylinder. The aperture adjustment device also includes an aperture adjustment cylinder, which is connected to the aperture extension ring and sleeved on the outer side of the main cylinder. The cam plate includes a first plate parallel to the two ports of the main cylinder and a second plate perpendicular to the two ports of the main cylinder. The first plate and the second plate are connected in a figure-7 shape, wherein the second plate is engaged with the limiting groove. A limiting structure, connected to the aperture extension ring and the main cylinder, is used to restrict the aperture extension ring from moving along the two groups of moving directions on the main cylinder. The limiting structure includes a lever, a first assembly hole on the aperture adjustment cylinder, a second assembly hole on the lever, and a rotation limiting groove extending circumferentially on the main cylinder. One end of the lever passes through the first assembly hole, the rotation limiting groove, and the second assembly hole in sequence, and the lever can move circumferentially in the rotation limiting groove along the main cylinder.

2. The aperture adjustment device for a lens according to claim 1, characterized in that, The limiting structure also includes an interface and a first step disposed on the inner side of the main cylinder. The interface is fixedly connected to one side of the main cylinder by screws. The aperture extension ring is located between the first step and the interface and is in clearance fit with the interface.

3. The aperture adjustment device for a lens according to claim 2, characterized in that, The aperture adjustment cylinder is located between the second step on the outside of the main cylinder and the interface, and is fitted with the interface with a gap.

4. The aperture adjustment device for a lens according to claim 1, characterized in that, The engagement length between the second plate and the limiting groove is greater than the maximum relative movement length between the main cylinder and the two groups.

5. The aperture adjustment device for a lens according to claim 1, characterized in that, The end of the cam plate that contacts the limiting groove is provided with a first rounded corner, and the end of the limiting groove that is close to the ring is provided with a second rounded corner, and the first rounded corner and the second rounded corner cooperate with each other.

6. A lens, characterized in that, The lens is provided with an aperture adjustment device as described in any one of claims 1 to 5.

Images