Gear set for lens focusing device, lens focusing device and focus following motor

Abstract

The utility model discloses a gear set for a lens focusing device, a lens focusing device using the gear set and a focus following motor, the gear set comprises a primary gear, a secondary gear and a mounting arm, the primary gear is meshed with a driving gear of the lens focusing device and is meshed with the secondary gear, and the secondary gear is also meshed with a gear ring of a lens; one end of the mounting arm is provided with a first connecting hole connected with an external mounting seat, and the other end of the mounting arm is provided with a second-stage gear mounting shaft used for mounting a second-stage gear. According to the gear set for the lens focusing device, the reduction ratio of the lens focusing device is changed and adjusted by arranging the first-stage gear and the second-stage gear, so that the torque for driving the gear ring of the lens to rotate is changed, the structure is simple, practical and effective, and the gear set for the lens focusing device, which is adaptive to lenses of different specifications, is urgently needed.

Description

Technical Field

[0001] The utility model relates to the technical field of photographic equipment, in particular to a gear set for a lens focusing device and a lens focusing device and a focus motor using the gear set. Background Art

[0002] The focus motor is a commonly used lens focusing device in photography and videography, used to achieve autofocus and keep the focus of the subject clear and stable. For example, in film and documentary production, the focus motor helps the photographer achieve smooth focus transitions, allowing the lens to capture moving objects and maintain a stable focus.

[0003] The focus motor is generally provided with a driving element and a gear. The driving element can control the rotation of the focus ring of the lens's gear ring in real time through an electric driving gear set, so as to adjust the focal length of the lens in real time according to the movement of the subject.

[0004] Existing follow-focus motors usually integrate the driving element and the gears, and the gear ratio between the two is fixed, so that a single follow-focus motor can only be used for one lens and cannot adapt to lenses of different sizes and specifications. Therefore, there is an urgent need for a gear set for a lens focusing device that can adapt to lenses of different specifications. Utility Model Content

[0005] The main purpose of the utility model is to provide a gear set for a lens focusing device, and to provide a gear set for a lens focusing device that can meet the needs of adapting to lenses of different specifications.

[0006] To achieve the above-mentioned purpose, the utility model proposes a gear set for a lens focusing device, a gear set for a lens focusing device, comprising a primary gear, a secondary gear and a mounting arm, the primary gear meshing with the driving gear of the lens focusing device and with the secondary gear, the secondary gear also meshing with the ring gear of the lens; one end of the mounting arm is constructed with a first connecting hole connected to an external mounting seat, and the other end is provided with a secondary gear mounting shaft for mounting the secondary gear.

[0007] In some embodiments, the gear group for the lens focusing device also includes a cover plate, which is configured with a second connecting hole for connecting the cover plate to the secondary gear mounting shaft and the primary gear mounting shaft for mounting the primary gear, so as to limit the primary gear and the secondary gear.

[0008] In some embodiments, the mounting arm is bent, and the secondary gear mounting shaft is located on one side of the mounting arm.

[0009] In some embodiments, the secondary gear is a compound gear, including a first gear portion and a second gear portion stacked together, the first gear portion meshingly connected to the primary gear, and the second gear portion meshingly connected to the gear ring of the lens.

[0010] Furthermore, the utility model proposes a lens focusing device, comprising a mounting seat and a driving mechanism, wherein the driving mechanism is located at one end of the mounting seat, and the lens focusing device also includes a gear set for the lens focusing device as described in the aforementioned embodiment, wherein the driving mechanism comprises a driving member and a driving gear, wherein the driving gear is arranged at the output end of the driving member, and the primary gear is meshed with the driving gear.

[0011] In some embodiments, the mounting seat is arranged in a strip shape, having a first side and a second side arranged opposite to each other, one end of the mounting seat is configured with a driven gear mounting portion for mounting the driving mechanism, the driven gear mounting portion includes a mounting notch formed by thinning the first side and a primary gear mounting shaft, and the primary gear mounting shaft is arranged on the bottom surface of the mounting notch; the driving member is arranged on the second side of the mounting seat, the driving gear extends into the interior of the mounting seat from the second side, and is partially exposed in the mounting notch;

[0012] The primary gear is sleeved on the primary gear installation shaft and can rotate around the primary gear installation shaft, and the driving gear is meshed with the primary gear.

[0013] In some embodiments, a third connection hole adapted to the first connection hole is provided on one side of the installation notch, and the third connection hole is a threaded connection hole.

[0014] In some embodiments, the primary gear mounting shaft and the secondary gear mounting shaft are configured with threaded holes for connecting the cover plate.

[0015] In some embodiments, the lens focusing device also includes a first bearing, a first bearing hole is opened on the side of the first-stage gear facing away from the cover plate, the first bearing is arranged in the first bearing hole, and is sleeved on the first-stage gear mounting shaft, and the first-stage gear is rotatably connected to the first-stage gear mounting shaft through the first bearing.

[0016] In some embodiments, the primary gear is a compound gear, including a third gear portion and a fourth gear portion which are stacked, the third gear portion is meshedly connected to the driving gear, and the fourth gear portion is meshedly connected to the secondary gear.

[0017] Furthermore, the utility model provides a focus motor, comprising a mounting seat and a driving mechanism, wherein the driving mechanism is located at one end of the mounting seat, and the lens focusing device further comprises:

[0018] The gear set for the lens focusing device described in the above embodiment detachably connected to the mounting seat, the driving mechanism comprises a driving member and a driving gear, the driving gear is arranged at the output end of the driving member, the primary gear is meshed with the driving gear; and,

[0019] A replacement gear set is detachably connected to the mounting seat; either the gear set for the lens focusing device recorded in the above embodiment or the replacement gear set is installed on the mounting seat and meshes with the driving gear.

[0020] The present application uses a primary gear, a secondary gear and a mounting arm to change the reduction ratio of the gear transmission through a gear set, thereby changing the torque of the gear ring driving the lens to rotate, so as to adapt to lenses of different specifications. At the same time, the mounting arm and the cover plate play a positioning and limiting function. This improves the accuracy and reliability of lens focusing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of an embodiment of the lens focusing device of the utility model;

[0022] Figure 2 This is a schematic structural diagram of a mounting arm of an embodiment of a lens focusing device of the utility model;

[0023] Figure 3 It is a partial structural schematic diagram of an embodiment of the lens focusing device of the utility model;

[0024] Figure 4 This is a schematic structural diagram of a first gear of an embodiment of a lens focusing device of the utility model;

[0025] Figure 5 This is a schematic structural diagram of a second gear of an embodiment of the lens focusing device of the utility model;

[0026] Figure 6 for Figure 4 FIG. 1 is a schematic structural diagram of a primary gear in another embodiment of the lens focusing device of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) 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.

[0029] 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.

[0030] In addition, the descriptions of "first", "second", etc. in the present utility model are only used 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 a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0031] Reference Figure 1 and Figure 2 The utility model proposes a gear set for a lens focusing device, comprising a primary gear 1, a secondary gear 2 and a mounting arm 3. The primary gear 1 is meshed with a driving gear of the lens focusing device and with the secondary gear 2. The secondary gear 2 is also meshed with a gear ring of the lens. One end of the mounting arm 3 is configured with a first connecting hole 30 connected to an external mounting seat, and the other end is provided with a secondary gear mounting shaft 31 for mounting the secondary gear 2.

[0032] In this embodiment, the photographic device is generally installed on a supporting structure such as a tripod or a pan head. The lens focusing device generally includes an external mounting seat and a driving element and gears arranged on the external mounting seat. The external mounting seat is connected to a supporting structure such as a tripod or a pan head, and the driving element is directly connected to the gear or indirectly connected to the gear.

[0033] The meshing of the primary gear 1 and the secondary gear 2 realizes the transmission of power, wherein the primary gear 1 can be connected to the driving element, and the secondary gear 2 is meshed and connected to the primary gear 1 and the ring gear of the lens. The driving element outputs driving power to drive the primary gear 1 to rotate. When the primary gear 1 is driven to rotate by the driving element that outputs driving force, the secondary gear 2 meshed with the primary gear 1 rotates accordingly, and the secondary gear 2 drives the ring gear of the lens to rotate, thereby realizing the adjustment of the focal length of the photographic device.

[0034] The mounting arm 3 is used to provide structural support for the installation of the secondary gear 2. The mounting arm 3 is connected to the external mounting seat through the first connecting hole 30 to achieve fixed installation of the secondary gear 2. The setting of the gear set of the present application scheme realizes the transmission and conversion of power. The output torque of the driving element can be changed by setting the primary gear 1 and the secondary gear 2 with different numbers of teeth, so that the lens focusing device can adapt to lenses of different specifications without replacing the driving element, so that the lens focusing device can perform precise focal length adjustment. At the same time, the meshing and movement of the gears ensure the reliable transmission of power and provide accurate control of the focal length, thereby improving the accuracy and stability of the lens focusing.

[0035] The present application changes the reduction ratio of the gear transmission through the arrangement of the primary gear 1, the secondary gear 2 and the mounting arm 3, thereby changing the torque of the gear ring driving the lens to rotate, so as to adapt to lenses of different specifications, and the mounting arm 3 and the cover plate 4 play the role of mounting the gear and limiting the displacement of the gear, which improves the accuracy and reliability of the lens focusing.

[0036] Reference Figure 1 In some embodiments, the gear group for the lens focusing device proposed in the embodiments of the utility model also includes a cover plate 4, which is configured with a second connecting hole for connecting the cover plate with the secondary gear mounting shaft 31 and the primary gear mounting shaft 53 for mounting the primary gear 1, so as to limit the primary gear 1 and the secondary gear 2.

[0037] In this embodiment, the cover plate 4 is used to limit the positions of the primary gear 1 and the secondary gear 2. The cover plate 4 is connected to the two gear mounting shafts by screws through the second connecting holes, etc., to achieve the limiting function, which can be used to ensure the correct installation of each gear in the gear set and control the range of motion, and prevent unnecessary displacement and shaking of each gear in the gear set during use.

[0038] Reference Figure 2 In some embodiments, the mounting arm 3 provided in the embodiment of the utility model is bent, and the secondary gear mounting shaft 31 is located on one side of the mounting arm 3 .

[0039] In this embodiment, the mounting arm 3 is bent, and the bending part corresponds to the primary gear 1. The bending part of the mounting arm 3 is arranged on the peripheral side of the primary gear 1. Since the gear group of the lens focusing device of the present application is replaced on the lens focusing device, the primary gear 1 and the secondary gear 2 are additionally added, and the connection distance between the driving element and the lens barrel of the photographic equipment is increased. The mounting arm 3 is bent so that the gear group of the present application can be installed outward, providing a structural basis for the secondary gear 2.

[0040] In some embodiments, the secondary gear 2 proposed in the embodiment of the utility model is a composite gear, including a first gear portion and a second gear portion stacked, the first gear portion meshingly connected to the primary gear 1, and the second gear portion meshingly connected to the gear ring of the lens.

[0041] In this embodiment, the secondary gear 2 can be a composite gear composed of a first gear portion and a second gear portion stacked, and the relative positions of the first gear portion and the second gear portion are fixed. The first gear portion is meshed and connected with the primary gear 1, and the second gear portion is meshed and connected with the gear ring of the lens. The first gear portion and the second gear portion are stacked on the primary gear 1.

[0042] When the driving member outputs driving force to rotate the driving gear 62, the primary gear 1 meshing with the driving gear 62 rotates, thereby driving the first gear portion of the secondary gear 2 to rotate. Since the secondary gear is a compound gear, the second gear portion rotates with the rotation of the first gear portion, thereby driving the gear ring of the lens barrel to rotate to achieve the focusing effect of the lens.

[0043] Reference Figure 1 and Figure 3 The utility model further proposes a lens focusing device, including a mounting seat 5 and a driving mechanism 6, wherein the driving mechanism 6 is located at one end of the mounting seat 5, and the lens focusing device also includes a gear set for the lens focusing device as described in the aforementioned embodiment, wherein the driving mechanism 6 includes a driving member 61 and a driving gear 62, wherein the driving gear 62 is disposed at the output end of the driving member 61, and the primary gear 1 is meshed with the driving gear 62.

[0044] In this embodiment, the driving mechanism 6 includes a driving member 61 and a driving gear 62. The driving member 61 is used to drive the driving gear 62 to rotate. The driving member 61 outputs a rotational force to drive the driving gear 62 to rotate. The driving gear 62 drives the primary gear 1 to rotate. The primary gear 1 drives the secondary gear 2 to rotate. The secondary gear 2 drives the ring gear of the lens to rotate, thereby changing the focal length of the lens of the photographic device. That is, through the torque transmission between the active gear 62 and the gears of each level of the gear set, the power can be finally applied from the driving mechanism 6 to the ring gear of the lens to achieve the focusing operation of the lens.

[0045] In some embodiments, the driving gear 62 is used as a universal gear. When a different gear set is replaced, the primary gear 1 in the gear set needs to mesh with the driving gear 62 .

[0046] In some embodiments, the drive mechanism 6 controls the focus of the lens by providing power and control signals. The drive mechanism 6 can receive instructions from the automatic control system of the lens and provide the required driving force according to the user's operation or according to the signal connection with the automatic control system of the lens, thereby achieving focal length adjustment. When the focal length needs to be adjusted, the drive mechanism 6 transmits power to the primary gear 1 through the active gear 62, the primary gear 1 transmits power to the secondary gear 2, and the secondary gear 2 acts on the lens, thereby driving the focus of the lens.

[0047] In some embodiments, the driving mechanism 6 can be a micro motor.

[0048] The present application scheme sets a driving member 61 and a driving gear 62, and the driving member 61 controls the rotation of the driving gear 62 according to the input driving force and control signal. The focal length of the lens can be adjusted by electric drive, electromagnetic drive or other appropriate drive methods to meet the needs of users or the instructions of the automatic control system.

[0049] Reference Figure 3 In some embodiments, the mounting seat 5 provided in the embodiment of the utility model is arranged in a strip shape, and has a first side and a second side arranged oppositely. One end of the mounting seat 5 is configured with a driven gear mounting portion for mounting the driving mechanism 6, and the driven gear mounting portion includes a mounting notch 52 formed by thinning the first side and a first-stage gear mounting shaft 53, and the first-stage gear mounting shaft 53 is arranged on the bottom surface of the mounting notch 52; the driving member 61 is arranged on the second side of the mounting seat 5, and the driving gear 62 extends into the interior of the mounting seat 5 from the second side and is partially exposed in the mounting notch 52;

[0050] The primary gear 1 is sleeved on the primary gear mounting shaft 53 and can rotate around the primary gear mounting shaft 53 . The driving gear 62 is meshed with the primary gear 1 .

[0051] In this embodiment, the mounting seat 5 is used to support and install the entire focusing device. The mounting seat 5 is arranged in a strip shape, having a first side and a second side opposite to each other. One end of the mounting seat 5 has a first connecting portion 51 for connecting to an external supporting device, and the other end has a mounting structure for mounting the driving mechanism 6. The mounting seat 5 is connected to the external supporting device through the first connecting portion 51, providing stable support for the focusing device. The mounting structure is located at the other end of the mounting seat 5, and is used to install the driving mechanism 6. The mounting structure includes a driven gear mounting portion, and the driven gear mounting portion includes a mounting notch 52 formed by thinning from the first side, and a primary gear mounting shaft 53 is arranged on the bottom surface of the mounting notch 52; the driving gear 62 of the driving mechanism 6 partially extends from the second side of the mounting seat 5 into the interior of the mounting seat 5, and is partially exposed in the mounting notch 52 of the mounting seat 5, and the primary gear 1 is meshed with the driving gear 62 exposed in the mounting notch 52. The design of the driving gear 62 being arranged inside the mounting seat 5 makes the lens focusing device of the present application more protective, and the motor shaft of the driving member 61 and most of the driving gear 62 are arranged inside the mounting seat 5 to avoid contamination by external dust and debris.

[0052] The installation notch 52 makes the lens focusing device of the present application more compact, and eliminates the need for misalignment between the driving gear 62 and the primary gear 1, making the overall volume lighter and simpler.

[0053] The present application scheme realizes precise focal length adjustment of the lens barrel of the photographic device through the support and mounting mechanism provided by the mounting seat 5, the power transmission and control of the driving mechanism 6, and the rotation of the gear set. This allows the user to change lenses of different specifications as needed, and only needs to replace the gear set corresponding to the lens specification to realize the focusing operation of lenses of different specifications.

[0054] Reference Figure 3 In some embodiments, a third connection hole 54 adapted to the first connection hole is provided on one side of the installation notch 52 of the embodiment of the utility model, and the third connection hole 54 is a threaded connection hole.

[0055] In this embodiment, the mounting arm 3 can be connected to the third connecting hole 54 by means of screws through the first connecting hole 30. When replacing gear sets of different specifications, mounting arms 3 of different specifications can be replaced, but the first connecting hole 30 on each mounting arm 3 is arranged corresponding to the third connecting hole 54. The above arrangement makes the mounting arm 3 modular and easy to disassemble and replace.

[0056] In some embodiments, the first connecting hole 30 and the third connecting hole 54 can also be connected by a pin shaft. Those skilled in the art can design it according to actual needs. No limitation is made here, as long as a detachable connection between the mounting arm 3 and the mounting base 5 can be achieved.

[0057] Reference Figure 3In some embodiments, the first-stage gear mounting shaft 53 and the second-stage gear mounting shaft 31 provided in the embodiments of the present utility model are configured with threaded holes for connecting the cover plate 4 .

[0058] In this embodiment, the cover plate 4 is provided with a through hole, and the through hole of the cover plate 4 is first aligned with the threaded holes of the primary gear mounting shaft 53 and the secondary gear mounting shaft 31. Then, a screw is inserted from the side of the cover plate 4 facing away from the two mounting shafts to connect the two threaded holes, so that the primary gear mounting shaft 53 and the secondary gear mounting shaft 31 are connected. The cover plate 4 has a limiting effect on the primary gear 1 and the secondary gear 2, preventing the two gears from loosening or falling off due to vibration or other external forces during rotation.

[0059] Reference Figure 4 In some embodiments, the lens focusing device proposed in the embodiment of the utility model also includes a first bearing. A first bearing hole 11 is opened on the side of the first-stage gear 1 facing away from the cover plate 4. The first bearing is arranged in the first bearing hole 11 and is sleeved on the first-stage gear mounting shaft 53. The first-stage gear 1 is rotatably connected to the first-stage gear mounting shaft 53 through the first bearing.

[0060] In this embodiment, the lens focusing device also includes a first bearing. A first bearing hole 11 for mounting the first bearing is provided on the side of the first gear 1 facing away from the cover plate 4. The outer wall of the first bearing is connected to the peripheral wall of the first bearing hole 11. The inner wall of the first bearing is sleeved on the first gear mounting shaft 53. The first gear 1 is rotatably connected to the first gear mounting shaft 53 via the first bearing. The first bearing can be a ball bearing. The bearing is a device for supporting and reducing friction between rotating parts. It is usually composed of an inner ring, an outer ring and a rolling element. It can withstand axial and radial loads and achieve relatively smooth rotation between two rotating parts. The present application scheme realizes the rotational connection between the first gear 1 and the first gear mounting shaft 53 by providing the support and friction reduction function of the first bearing.

[0061] Reference Figure 5 In some embodiments, the lens focusing device proposed in the embodiment of the utility model also includes a second bearing, and a second bearing hole 21 is opened on the side of the secondary gear 2 facing away from the cover plate 4. The second bearing is arranged in the second bearing hole 21 and is sleeved on the secondary gear mounting shaft 31. The secondary gear 2 is rotatably connected to the secondary gear mounting shaft 31 through the second bearing.

[0062] In this embodiment, the lens focusing device also includes a second bearing. A second bearing hole 21 for mounting the second bearing is provided on the side of the secondary gear 2 facing away from the cover plate 4. The outer wall of the second bearing is connected to the peripheral wall of the second bearing hole 21. The inner wall of the second bearing is sleeved on the secondary gear mounting shaft 31. The secondary gear 2 is rotatably connected to the secondary gear mounting shaft 31 through the second bearing. The second bearing can be a ball bearing. The bearing is a device for supporting and reducing friction between rotating parts. It is usually composed of an inner ring, an outer ring and a rolling element. It can withstand axial and radial loads and achieve relatively smooth rotation between the two rotating parts. The present application scheme realizes the rotational connection between the secondary gear 2 and the secondary gear mounting shaft 31 by providing the support and friction reduction function of the second bearing.

[0063] Reference Figure 6 In some embodiments, the primary gear 1 proposed in the embodiment of the utility model is a double-layer gear, including a third gear portion 13 and a fourth gear portion 14 that are stacked, the third gear portion 13 is meshedly connected to the driving gear 62, and the fourth gear portion 14 is meshedly connected to the secondary gear 2.

[0064] In this embodiment, the stacked third gear portion 13 and the fourth gear portion 14 form two layers of a composite gear, and the relative position of the third gear portion 13 and the fourth gear portion 14 is fixed. The third gear portion 13 is meshed and connected with the active gear 62, and the fourth gear portion 14 is meshed and connected with the secondary gear 2. The third gear portion 13 and the fourth gear portion 14 are stacked on the primary gear 1. When the active gear 62 rotates, the third gear portion 13 meshes with the active gear 62 to receive the rotational force of the active gear 62 driven by the driving member 61. At the same time, the fourth gear portion 14 meshes with the secondary gear 2, and the fourth gear portion 14 transmits the rotational force to the secondary gear 2, and the secondary gear 2 transmits the rotational force to the gear ring of the lens and drives the lens barrel to rotate.

[0065] The present application scheme realizes the structural setting of the composite gear by setting the first gear part and the second gear part, which is an alternative setting of the gear set. It can also achieve the technical effect of changing the reduction ratio to achieve the focusing effect while reducing the overall size and improving the compactness and efficiency of the device.

[0066] In some embodiments, the present invention provides a lens focusing device including a mounting seat and a driving mechanism, wherein the driving mechanism is located at one end of the mounting seat, and the lens focusing device further includes:

[0067] The gear set for the lens focusing device described in the above embodiment detachably connected to the mounting seat, the driving mechanism comprises a driving member and a driving gear, the driving gear is arranged at the output end of the driving member, the primary gear is meshed with the driving gear; and,

[0068] A replacement gear set is detachably connected to the mounting seat; either the gear set for the lens focusing device recorded in the above embodiment or the replacement gear set is installed on the mounting seat and meshes with the driving gear.

[0069] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A gear set for a lens focusing device, characterized in that: It includes a primary gear, a secondary gear and a mounting arm, wherein the primary gear is meshed with a driving gear of a lens focusing device and with the secondary gear, and the secondary gear is also meshed with a gear ring of the lens; one end of the mounting arm is configured with a first connecting hole connected to an external mounting seat, and the other end is provided with a secondary gear mounting shaft for mounting the secondary gear.

2. The gear set for a lens focusing device according to claim 1, characterized in that: The gear set for the lens focusing device also includes a cover plate, which is configured with a second connecting hole for connecting the cover plate to the secondary gear mounting shaft and the primary gear mounting shaft for mounting the primary gear, so as to limit the primary gear and the secondary gear.

3. The gear set for a lens focusing device according to claim 2, characterized in that: The mounting arm is bent, and the secondary gear mounting shaft is located on one side of the mounting arm.

4. The gear set for a lens focusing device according to any one of claims 1 to 3, characterized in that: The secondary gear is a compound gear, comprising a first gear portion and a second gear portion which are stacked, wherein the first gear portion is meshedly connected to the primary gear, and the second gear portion is meshedly connected to the gear ring of the lens.

5. A lens focusing device, comprising a mounting seat and a driving mechanism, wherein the driving mechanism is located at one end of the mounting seat, characterized in that: The lens focusing device also includes a gear set for a lens focusing device as described in any one of claims 1 to 4, the driving mechanism includes a driving member and a driving gear, the driving gear is arranged at the output end of the driving member, and the primary gear is meshed with the driving gear.

6. The lens focusing device according to claim 5, characterized in that: The mounting seat is arranged in a strip shape, and has a first side and a second side arranged opposite to each other. One end of the mounting seat is configured with a driven gear mounting portion for mounting the driving mechanism, and the driven gear mounting portion includes a mounting notch formed by thinning the first side and a primary gear mounting shaft, and the primary gear mounting shaft is arranged on the bottom surface of the mounting notch; the driving member is arranged on the second side of the mounting seat, and the driving gear extends into the interior of the mounting seat from the second side and is partially exposed in the mounting notch; The primary gear is sleeved on the primary gear installation shaft and can rotate around the primary gear installation shaft, and the driving gear is meshed with the primary gear.

7. The lens focusing device according to claim 6, characterized in that: A third connection hole matched with the first connection hole is arranged on one side of the installation notch, and the third connection hole is a threaded connection hole.

8. The lens focusing device according to claim 6, characterized in that: The first-stage gear installation shaft and the second-stage gear installation shaft are configured with threaded holes for connecting the cover plate.

9. The lens focusing device according to claim 5, characterized in that: The lens focusing device also includes a first bearing. A first bearing hole is opened on the side of the first-stage gear facing away from the cover plate. The first bearing is arranged in the first bearing hole and sleeved on the first-stage gear mounting shaft. The first-stage gear is rotatably connected to the first-stage gear mounting shaft through the first bearing.

10. The lens focusing device according to claim 9, characterized in that: The primary gear is a composite gear, comprising a third gear portion and a fourth gear portion which are stacked, the third gear portion being meshed and connected to the driving gear, and the fourth gear portion being meshed and connected to the secondary gear.

11. A focus motor, comprising a mounting seat and a driving mechanism, wherein the driving mechanism is located at one end of the mounting seat, characterized in that: The lens focusing device also includes: A gear set for a lens focusing device according to any one of claims 1 to 4, which is detachably connected to the mounting seat, wherein the driving mechanism comprises a driving member and a driving gear, the driving gear is arranged at the output end of the driving member, and the primary gear is meshed with the driving gear; and A replacement gear set is detachably connected to the mounting seat; the gear set for the lens focusing device according to any one of claims 1 to 4 and the replacement gear set are selectively installed on the mounting seat and meshed with the driving gear.

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