A zoom drive structure

Abstract

The present invention discloses a zoom driving structure, which comprises a transmission gear and a driving assembly, wherein the transmission gear is used to be connected to the zoom assembly for driving the zoom lens to move along its axial direction; the driving assembly comprises a driving gear and a driving device, wherein the driving device is connected to the driving gear for driving, the driving gear is meshed with the transmission gear, the driving gear has a first direction on its cross section, and the gear shaft of the driving gear can be elastically floated in the first direction, so that when the reaction force of the driving gear exceeds a predetermined value, the gear shaft of the driving gear floats in a direction deviating from the transmission gear, so that the driving gear is disengaged from the transmission gear. The present invention aims to solve the problem that when a motor drives a lens to zoom, when the lens reaches the limit position, the motor continues to rotate, causing the motor-driven lens to fail to automatically zoom.

Description

Technical Field

[0001] The present invention relates to the technical field of photography auxiliary devices, and in particular to a zoom driving structure. Background Art

[0002] With the development of society and the improvement of people's living standards, photography is no longer limited to professional photography organizations. Individuals can also own their own photographic equipment to meet their photography needs, making the use of photographic equipment more and more widespread. The optical lenses used in photographic equipment include fixed-focus lenses and zoom lenses. Compared with fixed-focus lenses, zoom lenses are adjustable and suitable for different photographic scenes, making the utilization rate of zoom lenses much higher than that of fixed-focus lenses. After the existing zoom lenses are installed on photographic equipment, they are generally zoomed by rotating the zoom ring on the lens by hand, which is laborious and inconvenient to use in photography scenes that require hands-free use. Therefore, devices that drive the lens to zoom by motor drive have begun to appear on some photographic devices.

[0003] However, the existing purely mechanical structure motor-driven lens zoom device cannot identify the movement state of the zoom component. When the zoom ring on the lens is adjusted to the limit, the motor gear continues to rotate, while the zoom ring cannot rotate. The motor gear will further squeeze the zoom ring, causing lateral displacement between the two, thereby causing gear disengagement, so that the motor gear can no longer drive the zoom ring to rotate, resulting in failure of the motor-driven lens automatic zoom, and even causing damage to the lens. In order to avoid the above situation, some zoom drive devices have begun to calculate the running stroke to ensure that the motor automatically stops when the zoom ring is rotated to the limit position. However, when using it, the user needs to input data and debug the device in advance, which is not convenient to use. In addition, this form of design requires software and hardware to cooperate with each other. At the same time, due to the large number of zoom lens styles, the design difficulty is too large and the production cost is also very high. Summary of the invention

[0004] The main purpose of the present invention is to propose a zoom drive structure, which aims to solve the problem that when a purely mechanical structure motor drives the lens to zoom, the motor continues to rotate, causing the motor-driven lens automatic zoom to fail or even damage the lens.

[0005] To achieve the above object, the present invention proposes a zoom driving structure, comprising:

[0006] A transmission gear is used to drive and connect with the zoom assembly to drive the zoom lens to move along its axis; and

[0007] A driving assembly, wherein the driving assembly includes a driving gear and a driving device, wherein the driving device is in driving connection with the driving gear, the driving gear is meshed with the transmission gear, the driving gear has a first direction on its cross section, and the gear shaft of the driving gear can be elastically floated in the first direction, so that when the reaction force of the transmission gear on the driving gear exceeds a predetermined value, the gear shaft of the driving gear floats in a direction deviating from the transmission gear, so that the driving gear is disengaged from the transmission gear.

[0008] Optionally, the zoom driving structure further includes a supporting member and an elastic floating member, wherein the elastic floating member is mounted on the supporting member, extends along the first direction and can be elastically retracted in the first direction; and the driving assembly is fixedly connected to the elastic floating member.

[0009] Optionally, the support member includes a connecting rod extending along a first direction, a guide groove is formed on the top of the connecting rod, the elastic floating member is arranged in the guide groove and can elastically extend and retract along the first direction; a clearance opening is formed on the side of the guide groove, and the clearance opening extends along the first direction; the driving assembly extends from the clearance opening into the guide groove and is connected to the elastic floating member.

[0010] Optionally, the open end of the guide groove is provided with a limiting device which can be adjusted along the first direction, one end of the elastic floating member abuts against the bottom of the guide groove, and the other end of the elastic floating member abuts against the limiting device, so as to adjust the pre-compression amount of the elastic floating member by adjusting the limiting device.

[0011] Optionally, the limiting device includes an adjusting member and a limiting member, the adjusting member extends into the opening of the guide groove and is movably adjustable along the first direction, the limiting member is arranged in the opening end of the guide groove, the adjusting member abuts against the outer end of the limiting member, and the elastic floating member abuts against the inner end of the limiting member.

[0012] Optionally, the elastic floating member includes a first elastic member and a second elastic member, one end of the first elastic member abuts against the bottom of the guide groove, the second elastic member is located between the first elastic member and the open end of the guide groove, and one end of the driving assembly is installed between the outer end of the first elastic member and the inner end of the second elastic member.

[0013] Optionally, an angle between a tangent line of a meshing point between the transmission gear and the driving gear and the first direction is set to be an acute angle.

[0014] Optionally, the support member includes a fixing rod and a locking structure, the fixing rod is extended along the axial direction of the driving gear; the top end of the locking structure is fixedly connected to the bottom end of the connecting rod, the bottom end of the locking structure can be rotatably adjusted around the fixing rod and is arranged on the fixing rod, and the locking structure can be moved and adjusted along the extension direction of the fixing rod.

[0015] Optionally, the locking structure includes a hoop and a locking piece, wherein the hoop is sleeved on the fixing rod; and the locking piece locks the hoop to fix the locking structure to the fixing rod.

[0016] Optionally, the connecting rod is bent and the bending portion of the connecting rod is arranged at an obtuse angle, and the driving assembly is arranged within the obtuse angle.

[0017] In the technical solution of the present invention, the transmission gear is used to be connected to the zoom assembly for driving the zoom lens to move along its axial direction; the driving assembly includes a driving gear and a driving device, the driving device is connected to the driving gear for driving, the driving gear is meshed with the transmission gear, the driving gear has a first direction on its cross section, and the gear shaft of the driving gear can be elastically floated in the first direction, so that when the reaction force of the driving gear received by the transmission gear exceeds a predetermined value, the gear shaft of the driving gear floats in a direction deviating from the transmission gear, so that the driving gear is disengaged from the transmission gear. When the zoom assembly on the zoom lens is not in the extreme position, the driving assembly normally drives the transmission gear to drive the zoom assembly to rotate to change the focal length of the zoom lens, and the driving assembly is in a state of force balance. When the zoom assembly rotates to the extreme position, the zoom assembly no longer rotates, and the transmission gear is also synchronously stuck and can no longer rotate. At this time, the driving gear is still driven by the driving device. At the meshing point between the driving gear and the transmission gear, the reaction force from the transmission gear along the tangent direction of the meshing point received by the driving gear will increase. When the component force of the reaction force along the first direction is greater than the component force in the first direction of the resultant force of other forces except the reaction force received by the driving assembly, the driving assembly drives the driving gear to move along the first direction so that the driving gear is disengaged from the transmission gear. At this time, the elastic floating arrangement The elastic force on the drive assembly increases in the opposite direction of the moving direction due to the movement of the drive assembly, so that the component force in the first direction of the resultant force of other forces other than the reaction force on the drive assembly increases due to the increase of the elastic force, and at the moment when the drive gear is disengaged from the transmission gear, the drive gear loses the reaction force from the transmission gear, and the component force in the first direction of the resultant force of other forces other than the reaction force on the drive assembly will push the drive gear to re-engage with the transmission gear, so as to achieve dynamic balance through repeated movement to ensure the dynamic contact between the drive gear and the transmission gear, and avoid the problem that the drive gear continuously acts on the transmission gear so that the drive gear and the transmission gear are squeezed and deformed against each other, resulting in the gear being laterally disengaged, causing the motor to control the automatic zoom of the lens to fail or even damage the zoom lens. At this time, the rotation direction of the drive gear is switched or the rotation of the drive gear is stopped, and the elastic force on the elastic floating setting of the drive assembly pushes the drive assembly to drive the drive gear back to the position where the drive assembly is balanced when the zoom assembly is not in the extreme position and re-engages with the transmission gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 A three-dimensional schematic diagram of an embodiment of a zoom drive mechanism provided by the present invention;

[0020] Figure 2 for Figure 1 A plan view of the zoom drive mechanism;

[0021] Figure 3 for Figure 1 A planar exploded schematic diagram of the zoom drive mechanism.

[0022] Description of Figure Numbers:

[0023]

[0024]

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications 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.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. 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 invention.

[0029] With the development of society and the improvement of people's living standards, photography is no longer limited to professional photography organizations. Individuals can also own their own photographic equipment to meet their photography needs, making the use of photographic equipment more and more widespread. The optical lenses used in photographic equipment include fixed-focus lenses and zoom lenses. Compared with fixed-focus lenses, zoom lenses are adjustable and suitable for different photographic scenes, making the utilization rate of zoom lenses much higher than that of fixed-focus lenses. After the existing zoom lenses are installed on photographic equipment, they are generally zoomed by rotating the zoom ring on the lens by hand, which is laborious and inconvenient to use in situations where hands-free photography is required. Therefore, devices that drive the lens to zoom by motor drive have begun to appear on some photographic devices.

[0030] However, the existing purely mechanical structure motor-driven lens zoom device cannot identify the movement state of the zoom component. When the zoom ring on the lens is adjusted to the limit, the motor gear continues to rotate, while the zoom ring cannot rotate. The motor gear will further squeeze the zoom ring, causing lateral displacement between the two, thereby causing gear disengagement, so that the motor gear can no longer drive the zoom ring to rotate, resulting in failure of the motor-driven lens automatic zoom, and even causing damage to the lens. In order to avoid the above situation, some zoom drive devices have begun to calculate the running stroke to ensure that the motor automatically stops when the zoom ring is rotated to the limit position. However, when using it, the user needs to input data and debug the device in advance, which is not convenient to use. In addition, this form of design requires software and hardware to cooperate with each other. At the same time, due to the large number of zoom lens styles, the design difficulty is too large and the production cost is also very high.

[0031] In view of this, the present invention provides a zoom driving structure. Figures 1 to 3 This is an embodiment of the zoom driving structure 100 provided by the present invention, and the zoom driving structure 100 will be described below in conjunction with specific drawings.

[0032] See also Figure 2 and Figure 3The zoom driving structure 100 includes a transmission gear 1 and a driving assembly 2. The transmission gear 1 is used to be connected to the zoom assembly to drive the zoom lens to move along its axial direction; the driving assembly 2 includes a driving gear 21 and a driving device 22. The driving device 22 is connected to the driving gear 21, and the driving gear 21 is meshed with the transmission gear 1. The driving gear 21 has a first direction on its cross section. The gear shaft of the driving gear 21 can be elastically floated in the first direction, so that when the reaction force of the driving gear 21 received by the transmission gear 1 exceeds a predetermined value, the gear shaft of the driving gear 21 floats in a direction deviating from the transmission gear 1, so that the driving gear 21 is disengaged from the transmission gear 1.

[0033] In the technical solution of the present invention, the transmission gear 1 is used to be connected to the zoom assembly for driving the zoom lens to move along its axial direction; the driving assembly 2 includes a driving gear 21 and a driving device 22, the driving device 22 is connected to the driving gear 21 for driving, the driving gear 21 is meshed with the transmission gear 1, the driving gear 21 has a first direction on its cross section, and the gear shaft of the driving gear 21 can be elastically floated in the first direction, so that when the reaction force of the driving gear 21 received by the transmission gear 1 exceeds a predetermined value, the gear shaft of the driving gear 21 floats in a direction deviating from the transmission gear 1, so that the driving gear 21 is disengaged from the transmission gear 1. When the zoom assembly on the zoom lens is not in the extreme position, the driving assembly 2 normally drives the transmission gear 1 to drive the zoom assembly to rotate to change the focal length of the zoom lens, and the driving assembly 2 is in a state of force balance. When the zoom assembly rotates to the extreme position, the zoom assembly no longer rotates, and the transmission gear 1 is also synchronously stuck and can no longer rotate. At this time, the driving gear 21 is still driven by the driving device 22. At the meshing point between the driving gear 21 and the transmission gear 1, the reaction force from the transmission gear 1 along the tangent direction of the meshing point received by the driving gear 21 will increase. When the component of the reaction force along the first direction is greater than the component of the resultant force of other forces except the reaction force received by the driving assembly 2 in the first direction, the driving assembly 2 drives the driving gear 21 to move along the first direction so that the driving gear 21 is out of meshing with the transmission gear 1. At this time, the elastic floating arrangement The elastic force on the driving component 2 increases in the direction opposite to the moving direction due to the movement of the driving component 2, so that the component force in the first direction of the resultant force of other forces except the reaction force on the driving component 2 increases due to the increase of the elastic force, and at the moment when the driving gear 21 is disengaged from the transmission gear 1, the driving gear 21 loses the reaction force from the transmission gear 1, and the component force in the first direction of the resultant force of other forces except the reaction force on the driving component 2 will push the driving gear 21 to re-engage with the transmission gear 1, so as to achieve dynamic balance through repeated movements to ensure the dynamic contact between the driving gear 21 and the transmission gear 1, and avoid the problem that the driving gear 21 continuously acts on the transmission gear 1, so that the driving gear 21 and the transmission gear 1 are squeezed and deformed against each other, resulting in the gear being laterally disengaged, causing the motor-controlled lens automatic zoom to fail or even causing damage to the zoom lens. At this time, the rotation direction of the driving gear 21 is switched or the rotation of the driving gear 21 is stopped, and the elastic force of the elastic floating setting of the driving component 2 pushes the driving component 2 to drive the driving gear 21 back to the position where the driving component 2 is balanced when the zoom component is not in the extreme position, and re-engages with the transmission gear 1.

[0034] See also Figure 1 and Figure 2 It should be noted that the driving gear 21 can be a zoom ring on a zoom lens, a gear meshing with the zoom ring, or a gear ring mounted on the zoom ring. In the present embodiment, the driving gear 21 is configured as a gear ring 11 mounted on the zoom ring, which can prevent the driving gear 21 from directly acting on the zoom ring and causing wear of the zoom ring. The gear ring 11 is configured as an adjustable clamp type, so that the gear ring 11 can be applied to zoom rings of different sizes and has universality.

[0035] See also Figure 3 The zoom driving structure 100 further includes a support member 3 and an elastic floating member 4. The elastic floating member 4 is mounted on the support member 3, extends along the first direction and can be elastically retracted in the first direction; the driving assembly 2 is fixedly connected to the elastic floating member 4. The elastic floating member 4 is fixedly connected to the driving assembly 2, and the elastic floating member 4 provides the elastic force of the driving assembly 2 along the first direction. When the zoom assembly of the zoom lens is not at the extreme position, the elastic floating member 4 provides the elastic force of the driving assembly 2 as a supporting force, so that the driving assembly 2 floats in the middle of the elastic floating member 4 and has a space for movement in both directions along the first direction, so that the driving assembly 2 can drive the driving gear 21 to disengage and engage with the transmission gear 1 in both directions along the first direction, so as to achieve the dynamic balance of the driving assembly 2 when the zoom assembly is at the two extreme positions. When the zoom assembly of the zoom lens is in the extreme position, the driving assembly 2 drives the driving gear 21 to disengage from the transmission gear 1, and the driving assembly 2 compresses the elastic floating component 4. The elastic force of the elastic floating component 4 increases, providing the driving assembly 2 with a thrust to drive the driving gear 21 to re-engage with the transmission gear 1, so that the driving assembly 2 drives the driving gear 21 to re-engage with the transmission gear 1. At this time, the elastic force of the elastic floating component 4 decreases, and the driving assembly 2 is subjected to the reaction force of the transmission gear 1 again, so that the driving assembly 2 drives the driving gear 21 to disengage from the transmission gear 1 again, thereby achieving the dynamic balance of the driving assembly 2. The driving component 2 floats on the middle part of the elastic floating part 4 and has space for movement along the first direction, that is, when the driving gear 21 rotates clockwise to an extreme position of the zoom assembly, the driving component 2 separates from the transmission gear 1 upward along the first direction to achieve dynamic balance; when the driving gear 21 rotates counterclockwise to another extreme position of the zoom assembly, the driving component 2 separates from the transmission gear 1 downward along the first direction to achieve dynamic balance.

[0036] See also Figure 3The support member 3 includes a connecting rod 31 extending along a first direction, a guide groove 32 is opened from the top of the connecting rod 31, the elastic floating member 4 is arranged in the guide groove 32 and can be elastically extended and retracted along the first direction; a clearance opening 321 is opened on the side of the guide groove 32, and the clearance opening 321 extends along the first direction; the driving component 2 extends from the clearance opening 321 into the guide groove 32 and is connected with the elastic floating member 4. The driving component 2 is provided with a connecting protrusion 23 at one end away from the driving gear 21. The connecting protrusion 23 extends from the clearance opening 321 into the guide groove 32 and is connected to the elastic floating component 4. The clearance opening 321 is smaller than the size of the elastic floating component 4 and the connecting protrusion 23. A detachable end cover 36 is provided at the top of the guide groove 32. The end cover 36 is removed so that the elastic floating component 4 and the connecting protrusion 23 can be placed into the guide groove 32 along the top of the guide groove 32. The end cover 36 is installed so that the elastic floating component 4 and the connecting protrusion 23 are installed and fixed in the guide groove 32. The guide groove 32 limits the movement of the elastic floating component 4 and the connecting protrusion 23 along the first direction, thereby preventing the elastic floating component 4 from being affected by forces in other directions and causing displacement relative to the driving component 2 or even detaching from the driving component 2. It also prevents the driving component 2 from moving in other directions, causing the dynamic balance of the driving component 2 to be destroyed, thereby ensuring the stability of the system.

[0037] See also Figure 3 The open end of the guide groove 32 is provided with a limit device 33 that can be adjusted along the first direction. One end of the elastic floating member 4 abuts against the bottom of the guide groove 32, and the other end of the elastic floating member 4 abuts against the limit device 33, so that the pre-compression amount of the elastic floating member 4 can be adjusted by adjusting the limit device 33. The limit device 33 is arranged at the top of the guide groove 32 and abuts against the elastic floating member 4. The limit device 33 can be adjusted along the first direction, so that the limit device 33 can adjust the compression amount of the elastic floating member 4, that is, adjust the elastic force of the elastic floating member 4 acting on the driving assembly 2. When the zoom assembly is not in the extreme state, the driving assembly 2 maintains a force balance state. For different zoom lenses, the thrust required for the zoom assembly to adjust the focal length of the zoom lens is different. At this time, the position of the limit device 33 is adjusted to adjust the compression amount of the elastic floating member 4 to change the size of the elastic force. In order to maintain the force balance state of the driving assembly 2, the reaction force of the driving assembly 2 exerted by the transmission gear 1 also changes accordingly. The force of the driving assembly 2 on the transmission gear 1 changes synchronously. The adjustable force size satisfies the different thrusts required for the zoom assembly to adjust the focal length of the zoom lens. That is, the limit device 33 is set to adjust the elastic floating member so that it can be applied to zoom lenses with different thrusts, and it has universality.

[0038] See also Figure 3 The limiting device 33 includes an adjusting member 331 and a limiting member 332. The adjusting member 331 extends into the opening of the guide slot 32 and is movable and adjustable along the first direction. The limiting member 332 is arranged in the opening end of the guide slot 32. The adjusting member 331 abuts against the outer end of the limiting member 332, and the elastic floating member 4 abuts against the inner end of the limiting member 332. It should be noted that the adjusting member 331 can be a screw or a hydraulic rod, and the limiting member 332 can be a cylindrical pin or a movable plate. In this embodiment, the adjusting member 331 is set as a screw 331a, which has a simple structure and is easy to adjust. The limiting member 332 is set as a cylindrical pin 332a to prevent the limiting member 332 from tilting in the guide slot 32 and ensure the stability of adjustment. The adjusting member 331 passes through the end cover 36 and abuts against the limiting member 332, so that the user can adjust the limiting member 332 in the guide groove 32 outside the guide groove 32, that is, at the top end of the connecting rod 31, avoiding the need to remove the end cover 36 for manual adjustment inside the guide groove 32, which is convenient and quick.

[0039] See also Figure 3The elastic floating member 4 includes a first elastic member 4a and a second elastic member 4b, one end of the first elastic member 4a abuts against the bottom of the guide groove 32, the second elastic member 4b is located between the first elastic member 4a and the open end of the guide groove 32, and one end of the driving assembly 2 is installed between the outer end of the first elastic member 4a and the inner end of the second elastic member 4b. The power of the driving device 22 is constant. When the zoom assembly is in a non-limit position, the driving gear 21 rotates clockwise or counterclockwise, and the force applied by the driving gear 21 to the transmission gear 1 is constant. The reaction force of the driving gear 21 received by the transmission gear 1 is also constant, but the direction is opposite to the meshing tangent of the driving gear 21 and the transmission gear 1; when the zoom assembly is in an limit position, the driving gear 21 rotates clockwise or counterclockwise, and the force applied by the driving gear 21 to the transmission gear 1 is constant. The reaction force of the driving gear 21 received by the transmission gear 1 is also constant, but the direction is opposite to the meshing tangent of the driving gear 21 and the transmission gear 1. The direction of the gravity exerted on the driving component 2 is always vertically downward. When the driving gear 21 is subjected to the reaction force of the transmission gear 1 in the direction upward along the meshing tangent of the driving gear 21 and the transmission gear 1, the elastic floating member 4 gives the driving component 2 a downward elastic force along the first direction, and the downward elastic force combines with the downward gravity and the upward reaction force to reach a balanced state; when the driving gear 21 is subjected to the reaction force of the transmission gear 1 in the direction downward along the meshing tangent of the driving gear 21 and the transmission gear 1, the elastic floating member 4 gives the driving component 2 an upward elastic force along the first direction, and the downward reaction force combines with the downward gravity and the upward elastic force to reach a balanced state. That is, when the driving gear 21 is in the two states of clockwise rotation and counterclockwise rotation, the reaction forces on the driving gear 21 are of the same magnitude and opposite directions, but the magnitude and direction of gravity are constant, and both states are in a balanced state, so that the upward elastic force must be greater than the downward elastic force. In order to ensure the balanced state of the driving assembly 2, the elastic floating member 4 is configured to abut against the first elastic member 4a and the second elastic member 4b at both ends of the driving assembly 2. The two elastic members are independently configured to facilitate the separate adjustment of the elastic force to meet the difference in the magnitude of the upward and downward elastic forces and to facilitate the separate replacement of the elastic members after they are damaged. It should be noted that the first elastic member and the second elastic member can be pressure rods or springs. In this embodiment, the first elastic member and the second elastic member are configured as springs, which have a simple structure and are inexpensive.

[0040] See also Figure 1The support member 3 includes a fixing rod 34 and a locking structure 35. The fixing rod 34 is extended along the axial direction of the driving gear 21. The top end of the locking structure 35 is fixedly connected to the bottom end of the connecting rod 31. The bottom end of the locking structure 35 can be rotated and adjusted around the fixing rod 34 and is arranged on the fixing rod 34. The locking structure 35 can be moved and adjusted along the extension direction of the fixing rod 34. The locking structure 35 can be rotated and adjusted around the fixing rod 34, so that the position of the driving gear 21 can be adjusted to adapt to the different distances between the driving gear 21 and the zoom lens caused by the different installation positions of the zoom driving structure 100 and the different sizes of the zoom lens, which has universality. The locking structure 35 can be moved and adjusted along the extension direction of the fixing rod 34 to adapt to the different positions of the zoom rings on different zoom lenses, which also has universality.

[0041] See also Figure 1 The locking structure 35 includes a hoop 351 and a locking member 352. The hoop 351 is sleeved on the fixed rod 34. The locking member 352 locks the hoop 351 to fix the locking structure 35 to the fixed rod 34. The locking structure 35 is set as a hoop 351 structure. The hoop 351 is sleeved on the fixed rod 34. The locking member 352 is used to lock the opening of the hoop 351 so that the hoop 351 is tightened to hold the fixed rod 34. The locking structure 35 does not directly act on the fixed rod 34, avoiding contact with the fixed rod 34 to cause the fixed rod 34 to wear, thereby extending the service life of the fixed rod 34. When the locking member 352 releases the hoop 351, the hoop 351 will not be separated from the fixed rod 34 but can be rotated or adjusted along the extension direction of the fixed rod 34, so as to facilitate the position adjustment of the drive assembly 2 when the hoop 351 is unlocked. It should be noted that the locking member 352 can be set as a bolt or as an elastic clip. In the present embodiment, the locking member 352 is set as a bolt 352a, which is cheap, easy to operate and can lock firmly.

[0042] See also Figure 2, the connecting rod 31 is bent and the bending part of the connecting rod 31 is set at an obtuse angle, and the driving assembly 2 is set within the obtuse angle. The connecting rod 31 is bent to make way for the movement of the driving assembly 2, so that when the meshing point of the driving gear 21 and the gear ring 11 is placed in the upper half of the gear ring 11, the driving gear 21 has a movement space to move along the first direction. When the meshing point of the driving gear 21 and the gear ring 11 is in the upper half of the gear ring 11, the self-weight of the driving assembly 2 and the connecting rod 31 has a component force perpendicular to the meshing tangent of the driving gear 21 and the gear ring 11 and pointing to the gear ring 11, so that the driving assembly 2 can be pressed on the gear ring 11 to prevent the driving assembly 2 from being separated from the gear ring 11 when the zoom assembly is in a non-limit position.

[0043] See also Figure 2 , the angle between the tangent of the meshing point between the transmission gear 1 and the driving gear 21 and the first direction is set to an acute angle. After the driving gear 21 is meshed with the transmission gear 1, the limit device 33 is adjusted to compress the elastic floating member 4, and the driving component 2 is subjected to the downward elastic force of the elastic floating member 4 along the first direction. The angle between the tangent of the meshing point between the transmission gear 1 and the driving gear 21 and the first direction is set to an acute angle, so that the elastic force on the driving component 2 has a component force perpendicular to the meshing tangent direction pointing to the transmission gear 1, so that the driving component 2 presses the transmission gear 1, and avoids the separation of the driving component 2 and the gear ring 11 when the zoom component is in a non-limit position.

[0044] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A zoom drive structure, characterized in that: include: A transmission gear is used to be connected to the zoom assembly to drive the zoom lens to move along its axial direction; as well as, A driving assembly, the driving assembly comprising a driving gear and a driving device, the driving device being in driving connection with the driving gear, the driving gear being meshed with the transmission gear, the driving gear having a first direction on its cross section, the gear shaft of the driving gear being elastically floatingly arranged in the first direction, so that when the reaction force of the transmission gear on the driving gear exceeds a predetermined value, the gear shaft of the driving gear floats in a direction deviating from the transmission gear, so that the driving gear is disengaged from the transmission gear; Wherein, the zoom driving structure further includes: a support member; and, An elastic floating member, the elastic floating member is installed on the supporting member, extends along the first direction and can be elastically telescopically arranged in the first direction; The driving assembly is fixedly connected to the elastic floating member; The support member includes a connecting rod extending along a first direction, a guide groove is formed on the top of the connecting rod, and the elastic floating member is arranged in the guide groove and can be elastically extended and retracted along the first direction; A clearance opening is formed on the side of the guide groove, and the clearance opening extends along the first direction; The driving assembly extends from the clearance opening into the guide groove and is connected to the elastic floating member; The transmission gear is configured as a gear ring, and the gear ring is used for being sleeved on a zoom ring in a zoom assembly.

2. The zoom driving structure according to claim 1, characterized in that: The open end of the guide groove is provided with a limiting device which can be adjusted along the first direction, one end of the elastic floating member abuts against the bottom of the guide groove, and the other end of the elastic floating member abuts against the limiting device, so as to adjust the pre-compression amount of the elastic floating member by adjusting the limiting device.

3. The zoom driving structure according to claim 2, characterized in that: The limiting device includes an adjusting member and a limiting member. The adjusting member extends into the opening of the guide groove and is movably adjustable along the first direction. The limiting member is arranged in the opening end of the guide groove. The adjusting member abuts against the outer end of the limiting member, and the elastic floating member abuts against the inner end of the limiting member.

4. The zoom driving structure according to claim 2, characterized in that: The elastic floating member includes a first elastic member and a second elastic member, one end of the first elastic member abuts against the bottom of the guide groove, the second elastic member is located between the first elastic member and the open end of the guide groove, and one end of the driving assembly is installed between the outer end of the first elastic member and the inner end of the second elastic member.

5. The zoom driving structure according to claim 2, characterized in that: An angle between a tangent line of a meshing point between the transmission gear and the driving gear and the first direction is set to be an acute angle.

6. The zoom driving structure according to claim 1, characterized in that: The support member comprises: a fixing rod extending along the axial direction of the driving gear; and A locking structure, wherein the top end of the locking structure is fixedly connected to the bottom end of the connecting rod, the bottom end of the locking structure is rotatably adjustable around the fixing rod and is arranged on the fixing rod, and the locking structure can be moved and adjusted along the extension direction of the fixing rod.

7. The zoom driving structure according to claim 6, characterized in that: The locking structure also includes: a clamp, the clamp being sleeved on the fixing rod; and A locking member is used to lock the clamp so that the locking structure is fixed to the fixing rod.

8. The zoom driving structure according to claim 1, characterized in that: The connecting rod is bent and the bending portion of the connecting rod is arranged at an obtuse angle, and the driving assembly is arranged within the obtuse angle.

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