Lens assembly, lens, and image pickup apparatus

Abstract

The utility model discloses a lens assembly, a lens and an image pickup device. The lens assembly comprises a first lens cone, a second lens cone, a third lens cone, a fourth lens cone and a connecting piece. The second lens cone is sleeved in the first lens cone and can move along the optical axis direction; the third lens cone is fixedly connected to one end of the first lens cone; the fourth lens cone is sleeved on the periphery of the third lens cone and the first lens cone. A second rolling module used for reducing the friction force when the fourth lens cone rotates relative to the third lens cone is arranged between the third lens cone and the fourth lens cone. The connecting piece is connected between the second lens cone and the fourth lens cone; when the fourth lens barrel rotates, the second lens barrel can be driven to move along the optical axis through the connecting piece. According to the technical scheme, smooth movement of the fourth lens cone is guaranteed through simple structural design, friction force between the fourth lens cone and the third lens cone can be reduced, and torsion is reduced.

Description

Technical Field

[0001] The present application relates to the field of photographic technology, and in particular to a lens assembly, a lens and an image pickup device. Background Art

[0002] In existing lenses, the lens barrels generally include the following two structures to achieve the lens barrel driving the lens to move for focusing. The first is that the moving lens barrel and the fixed lens barrel are matched through the inner and outer diameters; the second is that the moving lens barrel and the fixed lens barrel are matched through a guide shaft or a guide rod.

[0003] However, both of the above two structural settings have defects in practical applications. Among them, the first structural setting has too large a contact surface between the moving lens barrel and the fixed lens barrel. If the contact surface is not well processed, the friction will increase, the torque will become extremely large, and the actuation feel will not be smooth; the second structural setting has high requirements for the positioning accuracy of the guide shaft or guide rod. If the guide shaft has a position deviation, it will cause the motion group to be poorly actuated or even stuck directly; and the deviation of the guide shaft position will directly affect the center of the motion group and the fixed group.

[0004] Therefore, how to realize the driving of the moving lens barrel and improve its motion performance is a problem that needs to be solved. Utility Model Content

[0005] The present application provides a lens assembly, aiming to solve the problem that in the existing lens, the assembly docking structure between lens barrels has defects during actual application.

[0006] To achieve the above objectives, the present application proposes a lens assembly, which includes:

[0007] First lens barrel;

[0008] The second lens barrel is sleeved in the first lens barrel and can move along the optical axis;

[0009] A third lens barrel is fixedly connected to one end of the first lens barrel and is located on the same optical axis as the first lens barrel;

[0010] a fourth lens barrel, which is sleeved on the periphery of the third lens barrel and the first lens barrel, wherein a second rolling module is arranged between the third lens barrel and the fourth lens barrel, and the second rolling module is used to reduce the friction force when the fourth lens barrel rotates relative to the third lens barrel;

[0011] A connecting member, one end of which is connected to the second lens barrel, and the other end of which is connected to the fourth lens barrel;

[0012] When the fourth lens barrel rotates, it can drive the connecting member to move back and forth in the direction of the optical axis, thereby driving the second lens barrel to move along the direction of the optical axis.

[0013] In some embodiments, a first rolling module is disposed between the second lens barrel and the first lens barrel, and the first rolling module is used to reduce the friction between the second lens barrel and the first lens barrel when the second lens barrel moves along the optical axis direction.

[0014] In some embodiments, the first scrolling module includes:

[0015] A mounting seat is fixedly mounted on the outer wall of the second lens barrel, and a first mounting groove is formed on the mounting seat;

[0016] A first roller is movably mounted in the first mounting groove through a first bearing;

[0017] The height of the first roller is higher than the depth of the first mounting groove, so that the contact surface of the first roller abuts against the inner wall of the first lens barrel, and the first roller rolls when the second lens barrel moves along the optical axis.

[0018] In some embodiments, a guide groove along the optical axis direction is formed on the inner wall of the first lens barrel, and the first rolling module is embedded in the guide groove.

[0019] In some embodiments, a plurality of groups of the first rolling modules are arranged between the first lens barrel and the second lens barrel along the circumference of the second lens barrel, and the first rolling modules in each group are arranged at equal intervals.

[0020] In some embodiments, a second mounting groove is formed on the third lens barrel, and the second rolling module includes a second roller, and the second roller is movably mounted in the second mounting groove through a second bearing;

[0021] The height of the second roller is higher than the depth of the second mounting groove, so that the contact surface of the second roller abuts against the inner wall of the fourth lens barrel, and the second roller rolls when the fourth lens barrel rotates.

[0022] In some embodiments, the inner wall of the fourth lens barrel is provided with a spiral guide groove, and the first and second ends of the spiral guide groove are provided with through holes penetrating the side wall of the fourth lens barrel; the connecting member includes:

[0023] A guide block, one end of which is connected to the second lens barrel;

[0024] A connecting guide sleeve is connected to the other end of the guide block. The connecting guide sleeve can pass through the through hole and be fixed on the guide block, and is embedded in the spiral guide groove and moves along the spiral guide groove.

[0025] In some embodiments, a side wall of the first lens barrel is provided with an avoidance hole, and one end of the guide block is connected to the second lens barrel through the avoidance hole;

[0026] Wherein, guide steps are arranged on the side walls of both sides of the avoidance hole along the optical axis direction, and matching steps corresponding to the guide steps are arranged on the side edges of the guide block.

[0027] The present application also provides a lens, which includes the lens assembly as described above.

[0028] The present application also provides an image pickup device, which includes a camera body and the lens as described above, wherein the camera body is detachably connected to the lens.

[0029] The technical scheme of the present application proposes a lens assembly, which includes a first lens barrel, a second lens barrel, a third lens barrel, a fourth lens barrel and a connecting member; the first lens barrel and the third lens barrel are fixed lens barrels, which are coaxially arranged, the second lens barrel is sleeved in the first lens barrel and can move along the optical axis direction, the fourth lens barrel is sleeved in the third lens barrel and the periphery of the first lens barrel, and rotates with the relative position with the third lens barrel unchanged, and the lens assembly is provided with a connecting member, one end of the connecting member is connected to the second lens barrel, and the other end is connected to the fourth lens barrel, wherein when the fourth lens barrel rotates, the connecting member can be driven to reciprocate in the optical axis direction, thereby driving the second lens barrel to move along the optical axis direction. Further, a second rolling module is arranged between the third lens barrel and the fourth lens barrel, and when the fourth lens barrel rotates, the friction between the fourth lens barrel and the third lens barrel can be reduced by the rolling contact of the second rolling module; in this way, the driving of the second lens barrel when the fourth lens barrel is rotated can be realized through a simple structural design, and the fourth lens barrel can be ensured to move smoothly, reduce the friction between the fixed lens barrel and the fixed lens barrel, and reduce the torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0031] Figure 1 This is a schematic diagram of the assembly structure of a lens assembly according to an embodiment of the present application;

[0032] Figure 2 Figure 1 A schematic diagram of the structure in which the fourth lens barrel is hidden;

[0033] Figure 3 This is a schematic diagram of the installation position of the first rolling module of this application;

[0034] Figure 4 This is a schematic diagram of the installation of the first rolling module of this application;

[0035] Figure 5 This is a schematic diagram of the installation of the second rolling module of this application;

[0036] Figure 6 This is a schematic diagram of the structure of the fourth lens barrel of the present application;

[0037] Figure 7 This is a schematic diagram of the structure of the first lens barrel and the connecting member after explosion of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0041] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0042] See also Figure 1-Figure 5As shown, the present application provides a lens assembly 100. The lens assembly 100 includes a first lens barrel 10, a second lens barrel 20, a third lens barrel 30, a fourth lens barrel 40 and a connecting member 50. The second lens barrel 20 is sleeved in the first lens barrel 10 and can move along the optical axis. A first rolling module 60 is arranged between the second lens barrel 20 and the first lens barrel 10. The first rolling module 60 is used to reduce the friction between the second lens barrel 20 and the first lens barrel 10 when the second lens barrel 20 moves along the optical axis. The third lens barrel 30 is fixedly connected to one end of the first lens barrel 10 and is located on the same optical axis as the first lens barrel 10. The fourth lens barrel 40 is sleeved on the third lens barrel 30 and the periphery of the first lens barrel 10. A second rolling module 70 is arranged between the third lens barrel 30 and the fourth lens barrel 40. The second rolling module 70 is used to reduce the friction when the fourth lens barrel 40 rotates relative to the third lens barrel 30. One end of the connecting member 50 is connected to the second lens barrel 20, and the other end is connected to the fourth lens barrel 40. Wherein, when the fourth lens barrel 40 rotates, the connecting member 50 can be driven to reciprocate in the optical axis direction, thereby driving the second lens barrel 20 to move along the optical axis.

[0043] In the technical solution of the present application, the first lens barrel 10 and the third lens barrel 30 are fixed lens barrels, the second lens barrel 20 and the fourth lens barrel 40 are movable lens barrels, and the lens barrels are mostly special metal or plastic cylinders. Among them, the second lens barrel 20 can move along the optical axis direction, and the second lens barrel 20 can be used to install the lens group, and the lens can be focused when it moves along the optical axis direction; the relative position of the fourth lens barrel 40 and the third lens barrel 30 remains unchanged, and when the fourth lens barrel 40 rotates, the second lens barrel 20 can be driven to move along the optical axis direction through the connecting member 50, so the fourth lens barrel 40 can be used to install a focus ring, so as to rotate the focus ring to achieve focusing in the lens.

[0044] Furthermore, a first rolling module 60 is provided between the second lens barrel 20 and the first lens barrel 10, and a second rolling module 70 is provided between the third lens barrel 30 and the fourth lens barrel 40. Therefore, when the second lens barrel 20 moves along the optical axis direction, the friction between the second lens barrel 20 and the first lens barrel 10 can be reduced by the rolling contact of the first rolling module 60; when the fourth lens barrel 40 rotates, the friction between the fourth lens barrel 40 and the third lens barrel 30 can be reduced by the rolling contact of the second rolling module 70.

[0045] In summary, the technical solution of the present application realizes driving the second lens barrel 20 when rotating the fourth lens barrel 40 through a simple structural design, and can ensure smooth movement of the second lens barrel 20 and the fourth lens barrel 40, reduce friction with the fixed lens barrel, and reduce torque.

[0046] See also Figure 3 as well as Figure 4As shown, in some embodiments, the first rolling module 60 includes a mounting seat 61 and a first roller 63. The mounting seat 61 is fixedly mounted on the outer wall of the second lens barrel 20, and a first mounting groove 62 is formed on the mounting seat 61; the first roller 63 is movably mounted in the first mounting groove 62 through a first bearing 64. The height of the first roller 63 is higher than the groove depth of the first mounting groove 62, so that the contact surface (the roller circumferential side surface) of the first roller 63 abuts against the inner wall of the first lens barrel 10, and when the second lens barrel 20 moves along the optical axis direction, the first roller 63 rolls.

[0047] In this embodiment, the first rolling module 60 is fixed on the outer wall of the second lens barrel 20 to move with the second lens barrel 20. Specifically, after the first mounting groove 62 is opened on the mounting seat 61, when the first roller 63 is set, the two ends of the corresponding first bearing 64 can be inserted into the opposite sides of the first mounting groove 62 and fixed, and the first roller 63 is sleeved on the first bearing 64 and located in the first mounting groove 62. Further, when the height of the first roller 63 is higher than the groove depth of the first mounting groove 62, part of the contact surface of the first roller 63 is exposed relative to the first mounting groove 62, so that after the first rolling module 60 is set between the first lens barrel 10 and the second lens barrel 20, the contact surface of the first roller 63 abuts against the inner wall of the first lens barrel 10.

[0048] Thus, when the second lens barrel 20 moves along the optical axis, the first roller 63 can roll around the first bearing 64 under the action of the friction force in the opposite direction. At this time, it can be regarded as that the first lens barrel 10 is in contact with the second lens barrel 20 through the first roller 63, and the volume of the first roller 63 can be made very small, and thus the contact area with the first lens barrel 10 will also be very small. In addition, during the movement of the second lens barrel 20, the first roller 63 and the first lens barrel 10 are in rolling contact, so the friction force will also be very small.

[0049] It is worth noting that after the first roller 63 is installed based on the bearing, the installation direction of the first roller 63 can support rolling during the movement of the second lens barrel 20. Among them, the first bearing 64 can be a bearing nail, which is convenient for installation and fixing.

[0050] See also Figure 4 As shown, in some embodiments, a plurality of first mounting grooves 62 are formed on the mounting seat 61 along the optical axis direction, and a first roller 63 is installed in each first mounting groove 62 .

[0051] In this embodiment, the first rollers 63 are arranged front and back along the optical axis direction, which is conducive to balancing and stabilizing the movement of the second lens barrel 20. Exemplarily, in the optical axis direction, first mounting grooves 62 are respectively arranged near the two ends of the mounting seat 61, and the first rollers 63 are respectively arranged in the two first mounting grooves 62 to achieve common support of the front and rear ends.

[0052] Among them, the first roller 63 has the largest outer diameter in the middle part in the direction of its central axis, and the outer diameter gradually decreases along the two ends, that is, the overall shape of the first roller 63 is not a straight cylinder, and its contact surface is an arc-shaped design, which can fit the inner wall of the first lens barrel 10. In this way, compared with the straight cylinder design, it can change from point contact to line contact, and also achieves a balanced and stable effect.

[0053] See also Figure 4 As shown, in some embodiments, a positioning member 210 is disposed on the outer wall of the second lens barrel 20 , a positioning groove 65 is provided on the mounting seat 61 , and the mounting seat 61 is positioned on the second lens barrel 20 through the cooperation between the positioning groove 65 and the positioning member 210 .

[0054] In this embodiment, the cooperation of the positioning member 210 and the positioning groove 65 is provided to facilitate the installation of the mounting seat 61, wherein the positioning member 210 may be a positioning pin provided on the outer wall of the second lens barrel 20, and when fixing the mounting seat 61, the limiting pin is inserted into the positioning groove 65 to position the mounting seat 61, and the accuracy of the position is ensured in advance, and then the mounting seat 61 is fixed. The fixing of the mounting seat 61 may be locked by screws 66, wherein the screws 66 may be provided in multiple groups.

[0055] See also Figure 3 As shown, in some embodiments, a guide groove 110 is provided on the inner wall of the first lens barrel 10 along the optical axis, and the first rolling module 60 is embedded in the guide groove 110. In this way, the first rolling module 60 is embedded in the guide groove 110, and when the second lens barrel 20 moves along the optical axis, the first rolling module 60 and the guide groove 110 can be used to guide the second lens barrel 20 to assist the second lens barrel 20 in linear motion.

[0056] It can be understood that the first rolling modules 60 are arranged in multiple groups between the first lens barrel 10 and the second lens barrel 20 along the circumference of the second lens barrel 20, and the first rolling modules 60 are arranged at equal intervals. Through this structural arrangement, the first rollers 63 replace the contact between the first lens barrel 10 and the second lens barrel 20. When the second lens barrel 20 moves, the first rollers 63 roll instead of slide, and the friction is smaller.

[0057] The first rolling module 60 is arranged between the first lens barrel 10 and the second lens barrel 20, which can be regarded as supporting the second lens barrel 20 in the first lens barrel 10 through the first rolling module 60, so that the second lens barrel 20 is arranged coaxially with the first lens barrel 10. In the actual processing and assembly process, a processing error may occur, resulting in the second lens barrel 20 being biased to one side after assembly. In this case, a gasket (not shown in the drawings) can be placed between the first rolling module 60 and the second lens barrel 20 to adjust the position of the second lens barrel 20 so that the center of the second lens barrel 20 coincides with the optical axis.

[0058] See also Figure 2 as well as Figure 5 As shown, in some embodiments, the third lens barrel 30 is provided with a second mounting groove 31, and the second rolling module 70 includes a second roller 71, and the second roller 71 is installed in the second mounting groove 31 through a second bearing 72. The height of the second roller 71 is higher than the groove depth of the second mounting groove 31, so that the contact surface of the second roller 71 abuts against the inner wall of the fourth lens barrel 40, and when the fourth lens barrel 40 rotates, the second roller 71 rolls.

[0059] In this embodiment, the purpose of providing the second rolling module 70 is to replace the contact between the third lens barrel 30 and the fourth lens barrel 40 with the second roller 71, so that when the fourth lens barrel 40 rotates, the second roller 71 rolls around the second bearing 72, thereby reducing the friction generated when the third lens barrel 30 and the fourth lens barrel 40 are in direct contact, thereby reducing the torque when the fourth lens barrel 40 is rotated.

[0060] The second mounting groove 31 is provided on the third lens barrel 30, and the two ends of the second bearing 72 corresponding to the second roller 71 can be inserted into the opposite sides of the second mounting groove 31 and fixed, and the second roller 71 is sleeved on the bearing and located in the second mounting groove 31. When the height of the second roller 71 is higher than the groove depth of the second mounting groove 31, part of the contact surface of the second roller 71 is exposed relative to the second mounting groove 31, and after the second rolling module 70 is arranged between the third lens barrel 30 and the fourth lens barrel 40, the contact surface of the second roller 71 abuts against the inner wall of the fourth lens barrel 40.

[0061] It is also worth noting that the shape of the second roller 71 can also be a non-straight tube design, which can fit the inner wall of the fourth lens barrel 40. After the second roller 71 is installed based on the second bearing 72, the installation direction of the second roller 71 can support rolling during the rotation of the fourth lens barrel 40. Among them, the second rolling module 70 can be provided with multiple groups on the peripheral side of the third lens barrel 30, preferably four groups are provided, which are arranged around the third lens barrel 30.

[0062] See also Figure 1 as well as Figure 7 As shown, in some embodiments, the outer wall of the first lens barrel 10 is provided with bosses 130 at equal intervals along the circumference thereof, and the inner wall of the fourth lens barrel 40 contacts the surface of the bosses 130 .

[0063] It can be understood that, because the fourth lens barrel 40 is sleeved on the peripheries of the first lens barrel 10 and the third lens barrel 30 , the inner wall of the fourth lens barrel 40 is in contact with the outer wall of the first lens barrel 10 .

[0064] In this embodiment, the bosses 130 are arranged at equal intervals along the circumference of the outer wall of the first lens barrel 10, so that the outer diameter matching surface of the first lens barrel 10 is not matched throughout the entire circumference, but a part of the contact surface is retained through milling. For example, four small bosses 130 can be retained, and the rest can be milled off to reduce the large friction caused by too large a contact area.

[0065] See also Figure 2 as well as Figure 6 As shown, in some embodiments, the inner wall of the fourth lens barrel 40 is provided with a spiral guide groove 411, and the spiral guide groove 411 is provided with through holes 412 that penetrate the side wall of the fourth lens barrel 40 at both ends; the connecting member 50 includes a connecting guide sleeve 52 and a guide block 51; one end of the guide block 51 is connected to the second lens barrel 20; the connecting guide sleeve 52 is connected to the other end of the guide block 51, the connecting guide sleeve 52 can pass through the through hole 412 and be fixed on the guide block 51, and is embedded in the spiral guide groove 411 and moves along the spiral guide groove 411.

[0066] In this embodiment, the position of the fourth lens barrel 40 relative to the third lens barrel 30 remains unchanged. When the fourth lens barrel 40 is rotated, because the connecting guide sleeve 52 is limited, under the action of the force and the reaction force, the connecting guide sleeve 52 can move forward and backward along the spiral guide groove 411, driving the guide block 51 to move forward and backward (in the optical axis direction). Further, the connecting guide block 51 is fixed to the second lens barrel 20, and when the guide block 51 moves forward and backward, the second lens barrel 20 also moves forward and backward.

[0067] The connecting guide sleeve 52 and the guide block 51 are detachably connected. When through holes 412 penetrating the side wall of the fourth lens barrel 40 are provided at both ends of the spiral guide groove 411, the connecting guide sleeve 52 can be fixed or removed at both ends.

[0068] In a preferred embodiment, two groups of spiral guide grooves 411 are provided on the fourth lens barrel 40, and two groups of connecting members 50 are correspondingly provided. The two groups of connecting members 50 are arranged opposite to each other. When the fourth lens barrel 40 is rotated, the two groups of connecting members 50 work simultaneously to drive the first lens barrel 10 to move along the optical axis.

[0069] See also Figure 2 as well as Figure 7 As shown, in some embodiments, a side wall of the first lens barrel 10 is provided with an avoidance hole 120, and one end of the guide block 51 is connected to the second lens barrel 20 through the avoidance hole 120; wherein, guide steps 121 are provided on the side walls of the avoidance hole 120 along the optical axis direction, and a matching step 511 corresponding to the guide step 121 is provided on the side edge of the guide block 51.

[0070] It can be understood that when the connecting member 50 is set, the connecting member 50 is located between the first lens barrel 10 and the fourth lens barrel 40, that is, the connecting member 50 is relatively located on the outside of the first lens barrel 10, and the second lens barrel 20 is located on the inside of the first lens barrel 10. Therefore, it is necessary to open an avoidance hole 120 on the side wall of the first lens barrel 10 so that the guide block 51 in the connecting member 50 can be connected to the second lens barrel 20 and the movement of the guide block 51 along the optical axis can be avoided.

[0071] Among them, guide steps 121 are provided on the side walls of the avoidance hole 120 along the optical axis direction, and the side of the guide block 51 is provided with a matching step 511 corresponding to the guide step 121. The guide block 51 can be limited in the path formed by the avoidance hole 120 through the cooperation between the guide step 121 and the matching step 511, so that the guide block 51 moves in a straight line along the avoidance hole 120.

[0072] In summary, the process of realizing the movement of the second lens barrel 20 along the optical axis in the lens assembly 100 provided in the present application is: rotate the fourth lens barrel 40, drive the connecting guide sleeve 52 to move along the spiral guide groove 411 in the fourth lens barrel 40, and then drive the connecting guide sleeve 52 to drive the guide block 51 to move along the avoidance hole 120 along the optical axis direction. The guide block 51 is fixedly connected to the second lens barrel 20, so that the second lens barrel 20 can be further driven to move along the guide groove 110.

[0073] The present application also provides a lens, which includes the lens assembly 100 as described above.

[0074] In this embodiment, the lens adopts all the technical solutions of all the embodiments of the lens assembly 100, and therefore has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0075] The present application also provides an image pickup device, which includes a camera body and the lens as above, and the camera body and the lens are detachably connected.

[0076] In this embodiment, the image sensor adopts all the technical solutions of all the above lens embodiments, and therefore has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0077] The above description is only a partial or preferred embodiment of the present application. Neither the text nor the drawings can limit the scope of protection of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the overall concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A lens assembly, characterized in that: include: First lens barrel; The second lens barrel is sleeved in the first lens barrel and can move along the optical axis; A third lens barrel, fixedly connected to one end of the first lens barrel and located on the same optical axis as the first lens barrel; a fourth lens barrel, which is sleeved on the periphery of the third lens barrel and the first lens barrel, wherein a second rolling module is arranged between the third lens barrel and the fourth lens barrel, and the second rolling module is used to reduce the friction force when the fourth lens barrel rotates relative to the third lens barrel; A connecting member, one end of which is connected to the second lens barrel, and the other end of which is connected to the fourth lens barrel; When the fourth lens barrel rotates, it can drive the connecting member to move back and forth in the direction of the optical axis, thereby driving the second lens barrel to move along the direction of the optical axis.

2. The lens assembly according to claim 1, characterized in that: A first rolling module is disposed between the second lens barrel and the first lens barrel, and the first rolling module is used to reduce the friction between the second lens barrel and the first lens barrel when the second lens barrel moves along the optical axis direction.

3. The lens assembly according to claim 2, characterized in that: The first scrolling module includes: A mounting seat is fixedly mounted on the outer wall of the second lens barrel, and a first mounting groove is formed on the mounting seat; A first roller is movably mounted in the first mounting groove through a first bearing; The height of the first roller is higher than the depth of the first mounting groove, so that the contact surface of the first roller abuts against the inner wall of the first lens barrel, and the first roller rolls when the second lens barrel moves along the optical axis.

4. The lens assembly according to claim 3, characterized in that: A guide groove along the optical axis direction is formed on the inner wall of the first lens barrel, and the first rolling module is embedded in the guide groove.

5. The lens assembly according to any one of claims 2 to 4, characterized in that: The first rolling modules are arranged in a plurality of groups between the first lens barrel and the second lens barrel along the circumference of the second lens barrel, and the first rolling modules in each group are arranged at equal intervals.

6. The lens assembly according to claim 1, characterized in that: The third lens barrel is provided with a second mounting groove, the second rolling module comprises a second roller, and the second roller is movably mounted in the second mounting groove through a second bearing; The height of the second roller is higher than the depth of the second mounting groove, so that the contact surface of the second roller abuts against the inner wall of the fourth lens barrel, and the second roller rolls when the fourth lens barrel rotates.

7. The lens assembly according to claim 1, characterized in that: The inner wall of the fourth lens barrel is provided with a spiral guide groove, and the first and second ends of the spiral guide groove are provided with through holes penetrating the side wall of the fourth lens barrel; the connecting member comprises: A guide block, one end of which is connected to the second lens barrel; A connecting guide sleeve is connected to the other end of the guide block. The connecting guide sleeve can pass through the through hole and be fixed on the guide block, and is embedded in the spiral guide groove and moves along the spiral guide groove.

8. The lens assembly according to claim 7, characterized in that: The side wall of the first lens barrel is provided with an avoidance hole, and one end of the guide block is connected to the second lens barrel through the avoidance hole; Wherein, guide steps are arranged on the side walls of both sides of the avoidance hole along the optical axis direction, and matching steps corresponding to the guide steps are arranged on the side edges of the guide block.

9. A lens, characterized in that: The lens comprises a lens assembly as described in any one of claims 1-8.

10. An image pickup device, characterized in that: The image pickup device includes a camera body and the lens as claimed in claim 9, wherein the camera body is detachably connected to the lens.

Images