Zoom lens barrel and automatic zoom lens
By introducing an electric drive component and guide hole design into the lens, automatic zoom of the lens is realized, solving the problems of slow zoom speed and large size, improving zoom speed and accuracy, and reducing the size of the lens.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 成都联江科技有限公司
- Filing Date
- 2025-05-08
- Publication Date
- 2026-05-01
AI Technical Summary
Existing lenses cannot achieve automatic zoom, zoom speed is slow and inaccurate, and lenses are generally bulky.
The zoom lens barrel includes a lens barrel, a fixing component, a zoom component, and an electric drive component. The electric drive component drives the mounting base to move back and forth, thereby enabling the zoom lens group to achieve automatic zoom. The design of the guide hole and drive groove reduces the size of the lens.
It achieves automatic zoom in the lens, improving zoom speed and accuracy while reducing the size of the lens.
Smart Images
Figure CN224190306U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lens technology, and in particular to a zoom lens barrel and an automatic zoom lens. Background Technology
[0002] With the progress of the times and the development of electronic technology, people's requirements for optical lenses are increasing day by day. Ordinary lenses zoom manually, that is, by manually rotating the lens to extend or retract it to focus. They cannot zoom automatically, and the zoom speed is slow and inaccurate.
[0003] Therefore, how to enable automatic zoom in lenses is a problem that urgently needs to be solved by those in the field. Utility Model Content
[0004] The main purpose of this invention is to provide a zoom lens barrel and an automatic zoom lens, which aims to achieve automatic zooming of the lens.
[0005] To achieve the above objectives, the zoom lens barrel proposed in this utility model includes a lens barrel, a fixing component, at least one zoom component, and an electric drive component; the lens barrel has a mounting channel extending in the front-rear direction; the fixing component includes a fixing seat fixedly disposed at the front end of the lens barrel, the fixing seat being used to mount the fixed lens group; at least one zoom component includes a mounting seat movably disposed in the mounting channel in the front-rear direction, the mounting seat being used to mount the zoom lens group, so as to drive the zoom lens group to move closer to or away from the fixed lens group during its movement; the electric drive component is drivenly connected to the mounting seat.
[0006] In one embodiment, the electric drive assembly includes a drive motor, a potentiometer, and a transmission assembly; the drive motor is disposed on the outer wall of the lens barrel, and a drive gear is disposed on the output shaft of the drive motor; the potentiometer is disposed on the outer wall of the lens barrel and spaced apart from the drive motor along the circumference of the lens barrel, and a driven gear is disposed on the rotating shaft of the potentiometer; the transmission assembly includes a connecting part and a drive rack disposed along the circumference of the lens barrel, the drive rack meshing with the drive gear and the driven gear, and the connecting part connecting the drive rack and the mounting base.
[0007] In one embodiment, a guide hole is provided on the wall of the mounting channel, and the guide hole extends in the front-back direction; the connecting part includes a drive cylinder and at least one protrusion; the drive cylinder is sleeved on the outside of the lens barrel and is coaxially arranged with the lens barrel, the drive cylinder rotates along the axis extending in the front-back direction, at least one drive groove is provided on the inner wall of the drive cylinder, the drive groove extends in the front-back direction, and the front end and the rear end of the drive groove are offset along the circumference of the lens barrel, and a drive rack is provided on the outer wall of the drive cylinder; one end of the protrusion is fixedly connected to the mounting base, and the other end passes through the guide hole and extends into the drive groove, so as to drive the mounting base to move in the front-back direction when the drive cylinder rotates.
[0008] In one embodiment, the rear end face of the drive cylinder is at least partially inclined to form a first pressing surface, the rear end face of the drive cylinder abuts against the housing of the drive motor, the drive cylinder, the mirror barrel, and the housing of the drive motor together define a first annular cavity at the first pressing surface, a first lubricating element is disposed in the first annular cavity abutting against the first pressing surface, and lubricates the connection of the first annular cavity when the drive cylinder rotates; and / or, the front end face of the drive cylinder is at least partially inclined to form a second pressing surface, the front end face of the drive cylinder abuts against the fixed base, the drive cylinder, the mirror barrel, and the fixed base together define a second annular cavity, a second lubricating element is disposed in the second annular cavity abutting against the second pressing surface, and lubricates the connection of the second annular cavity when the drive cylinder rotates.
[0009] In one embodiment, both the first lubricant and the second lubricant include a plurality of steel balls, and the plurality of steel balls abut against the first pressing surface or the second pressing surface.
[0010] In one embodiment, the zoom assembly further includes a slider, which is fixedly connected to the mounting base and slidably disposed in the guide hole in the front-back direction; the slider with a protrusion passing through the guide hole is fixedly connected to the mounting base.
[0011] In one embodiment, a sleeve is embedded on the surface of the slider; one end of the protrusion is threadedly connected to the sleeve and the mounting seat in sequence, and the other end of the protrusion is slidably engaged with the drive groove. The diameter of the protrusion gradually increases in the direction from the inside of the sleeve to the outside.
[0012] In one embodiment, two zoom components are provided, and the two mounting seats are spaced apart in the front-to-back direction; the inner wall of the drive cylinder has two drive grooves arranged sequentially in the front-to-back direction, and the distance between the two drive grooves in the circumferential direction of the drive cylinder gradually increases or decreases in the front-to-back direction; two protrusions are provided, and the two protrusions are fixedly connected to the two mounting seats respectively, and slidably engaged with the two drive grooves respectively, so that the two zoom components move closer or further apart when the two mounting seats are moved.
[0013] In one embodiment, the fixed base and the mounting base are provided with mounting grooves on their opposite sides; the fixed assembly and / or zoom assembly also include a pressing member for pressing and fixing the fixed lens group or zoom lens group in the corresponding mounting groove.
[0014] This utility model also proposes an automatic zoom lens, which includes a fixed lens group, at least one zoom lens group, and a zoom lens barrel as described above; the fixed lens group is mounted on a fixed base; and the zoom lens group is correspondingly mounted on a mounting base.
[0015] The technical solution of this utility model adopts a fixed base to install a fixed lens group, and the mounting base is used to install a zoom lens group. The mounting base is driven to move back and forth through an electric drive component. When the mounting base moves back and forth, it drives the zoom lens group to move back and forth, thereby realizing automatic zooming, which is convenient to operate and improves the zooming speed. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0017] Figure 1 A schematic diagram of the structure of an embodiment of the zoom lens barrel provided by this utility model;
[0018] Figure 2 for Figure 1 A cross-sectional view of the medium zoom lens barrel.
[0019] Explanation of icon numbers:
[0020] 100. Zoom lens barrel; 1. Lens barrel; 11. Guide hole; 2. Fixing assembly; 21. Fixing base; 3. Zoom assembly; 31. Mounting base; 32. Slider; 33. Sleeve; 4. Electric drive assembly; 41. Drive motor; 411. Drive gear; 42. Potentiometer; 421. Driven gear; 43. Transmission assembly; 431. Connecting part; 4311. Drive cylinder; 4312. Drive groove; 4313. Protrusion; 432. Drive rack; 51. First annular cavity; 52. First lubricant; 53. Second annular cavity; 54. Second lubricant; 55. Mounting groove; 56. Pressure ring.
[0021] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0025] With the progress of the times and the development of electronic technology, people's requirements for optical lenses are increasing day by day. Ordinary lenses zoom manually, that is, by manually rotating the lens to extend or retract it to focus. They cannot zoom automatically, and ordinary zoom lenses are bulky.
[0026] Therefore, to provide a lens capable of automatic zoom and with a compact size, this utility model proposes a zoom lens barrel 100. Please refer to [link / reference]. Figure 1 and Figure 2 In an embodiment of this utility model, to achieve the above objective, the zoom lens barrel 100 proposed by this utility model includes a lens barrel 1, a fixing component 2, at least one zoom component 3, and an electric drive component 4; the lens barrel 1 has a mounting channel extending in the front-rear direction; the fixing component 2 includes a fixing seat 21 fixedly disposed at the front end of the lens barrel 1, the fixing seat 21 being used to mount the fixed lens group; at least one zoom component 3 includes a mounting seat 31 movably disposed in the mounting channel in the front-rear direction, the mounting seat 31 being used to mount the zoom lens group, so as to drive the zoom lens group to move closer to or away from the fixed lens group during its movement; the electric drive component 4 is drivenly connected to the mounting seat 31.
[0027] The technical solution of this utility model adopts a fixed base 21 to install a fixed lens group and a mounting base 31 to install a zoom lens group. The mounting base 31 is driven to move back and forth through an electric drive component 4. When the mounting base 31 moves back and forth, it drives the zoom lens group to move back and forth, thereby realizing automatic zooming, which is convenient to operate and improves the zooming speed.
[0028] It should be noted that the mounting base 31 can be movably arranged in the front-to-back direction in the form of a slide rail slider structure, a guide rod guide sleeve structure, or other structural forms that allow the mounting base 31 to move.
[0029] In one embodiment, there is one zoom assembly 3, and the electric drive assembly 4 drives a mounting base 31 to move back and forth to perform zooming; in another embodiment, there are two zoom assemblies 3, and the two zoom assemblies are arranged at intervals along the front and back, and the electric drive assembly 4 drives the two zoom assemblies 3 to move back and forth to perform zooming. By performing zooming through two zoom lens groups, aberrations and other optical problems can be better controlled, thereby improving image quality.
[0030] In an embodiment of this utility model, the electric drive assembly 4 includes a drive motor 41, a potentiometer 42, and a transmission assembly 43. The drive motor 41 is disposed on the outer side wall of the lens barrel 1, and a drive gear 411 is disposed on the output shaft of the drive motor 41. The potentiometer 42 is disposed on the outer side wall of the lens barrel 1 and is spaced apart from the drive motor 41 along the circumference of the lens barrel 1. A driven gear 421 is disposed on the rotating shaft of the potentiometer 42. The transmission assembly 43 includes a connecting part 431 and a drive rack 432 disposed along the circumference of the lens barrel 1. The drive rack 432 meshes with the drive gear 411 and the driven gear 421. The connecting part 431 connects the drive rack 432 and the mounting base 31. Thus, the drive motor 41 drives the drive rack 432 to rotate. When the drive rack 432 rotates, it drives the mounting base 31 through the connecting part 431, thereby automatically zooming. During the automatic zooming process, the driven gear 421 follows the drive rack 432 to rotate and drives the rotating shaft of the potentiometer 42 to rotate. When the rotating shaft of the potentiometer 42 rotates, the resistance value connected in the control circuit changes. The control circuit determines the position of the zoom lens group based on the resistance value and controls the rotation direction of the drive motor 41 accordingly to control the focal length in real time. At the same time, by setting both the drive motor 41 and the potentiometer 42 on the outer wall of the lens and spacing them apart, the space utilization near the lens barrel 1 is improved, thereby reducing the overall size of the lens. The length of the zoom lens barrel 100 can be reduced to 80mm, and the maximum radial dimension including the drive motor 41 can be reduced to 50mm.
[0031] The control circuit is a circuit system that controls various functions of the lens. Through the coordinated action of the processor, sensors, and communication interfaces, it achieves precise control of various functions of the lens. Its specific details will not be elaborated here.
[0032] Furthermore, the electric drive assembly 4 also includes a drive mounting component for mounting the drive motor 41 and the potentiometer 42. The drive mounting component includes a fixing part and two mounting parts. The fixing part is arranged in a ring shape, sleeved on the outer side of the lens barrel 1 and fixedly mounted to the lens barrel 1. The two mounting parts are arranged on the outer side wall of the fixing part and spaced apart from each other. Each mounting part has an opening in the front-rear direction, which extends in the front-rear direction for mounting the drive motor 41 or the potentiometer 42. The drive mounting component allows the drive motor 41 and the potentiometer 42 to be mounted in the circumference of the lens barrel, which simplifies the structure and can improve the installation speed.
[0033] In an embodiment of this utility model, a guide hole 11 is provided on the wall of the mounting channel, and the guide hole 11 extends in the front-back direction; the connecting part 431 includes a drive cylinder 4311 and at least one protrusion 4313; the drive cylinder 4311 is sleeved on the outside of the lens barrel 1 and is coaxially arranged with the lens barrel 1, the drive cylinder 4311 rotates along the axis extending in the front-back direction, at least one drive groove 4312 is provided on the inner wall of the drive cylinder 4311, the drive groove 4312 extends in the front-back direction, and the front end and the rear end of the drive groove 4312 are offset along the circumference of the lens barrel 1, and a drive rack 432 is provided on the outer wall of the drive cylinder 4311; one end of the protrusion 4313 is fixedly connected to the mounting base 31, and the other end passes through the guide hole 11 and extends into the drive groove 4312, so as to drive the mounting base 31 to move in the front-back direction when the drive cylinder 4311 rotates. Thus, when the drive rack 432 rotates, it drives the drive cylinder 4311 to rotate. The cam transmission between the protrusion 4313 and the drive groove 4312 causes the drive cylinder 4311 to drive the mounting base 31 to move back and forth when it rotates, thereby zooming. The mounting base 31 is located inside the lens barrel 1, the drive cylinder 4311 is sleeved on the outside of the lens barrel 1, and the protrusion 4313 is fixed on the mounting base 31 and passes through the lens barrel 1 through the guide hole 11 to save space and reduce the size of the lens.
[0034] It should be noted that the drive groove 4312 extends in the front-to-back direction, and the front end and the rear end of the drive groove 4312 are offset from each other along the circumference of the lens barrel 1. The main body of the drive groove 4312 between the front end and the rear end is not restricted and can be spiral.
[0035] Furthermore, the pitch of the spiral drive groove 4312 can be varied as needed. With the drive motor 41 rotating at the same speed, a smaller pitch allows for more precise position control of the mounting base 31, resulting in a more accurate zoom effect. The pitch of the spiral drive groove 4312 can also be varied along the front-to-back direction as required.
[0036] While ensuring that the lens components are compact and miniaturized, the drive cylinder 4311 will come into contact with other components such as the lens barrel 1 and the housing of the drive motor 41 when it rotates, affecting the smoothness of rotation. Therefore, in the embodiments of this utility model, the rear end face of the drive cylinder 4311 is at least partially inclined to form a first pressing surface, the rear end face of the drive cylinder 4311 abuts against the housing of the drive motor 41, the drive cylinder 4311, the mirror barrel 1, and the housing of the drive motor 41 together define a first annular cavity 51 at the first pressing surface, a first lubricating element 52 abutting against the first pressing surface is provided in the first annular cavity 51, and the connection of the first annular cavity 51 is lubricated when the drive cylinder 4311 rotates; and / or, the front end face of the drive cylinder 4311 is at least partially inclined to form a second pressing surface, the front end face of the drive cylinder 4311 abuts against the fixed seat 21, the drive cylinder 4311, the mirror barrel 1, and the fixed seat 21 together define a second annular cavity 53, a second lubricating element 54 abutting against the second pressing surface is provided in the second annular cavity 53, and the connection of the second annular cavity 53 is lubricated when the drive cylinder 4311 rotates. Thus, by using the first lubricant 52 and the second lubricant 54, the friction between the drive cylinder 4311 and the lens barrel 1, between the drive cylinder 4311 and the fixed base 21, and between the drive cylinder 4311 and the housing of the drive motor 41 is reduced, making the rotation of the drive cylinder 4311 smoother and extending its service life. Furthermore, the drive cylinder 4311, the lens barrel 1, and the housing of the drive motor 41 together define the first annular cavity 51 at the first pressing surface, and the drive cylinder 4311, the lens barrel 1, and the fixed base 21 together define the second annular cavity 53. The first lubricant 52 and the second lubricant 54 are respectively provided to lubricate the connection points, which improves the overall structural compactness and reduces the size of the lens without affecting performance.
[0037] It should be noted that when a drive mounting component is provided, the drive cylinder 4311, the mirror cylinder 1, and the drive mounting component together define the first annular cavity 51 at the first pressing surface.
[0038] In embodiments of this invention, both the first lubricant 52 and the second lubricant 54 include multiple steel balls, which abut against either the first or second pressing surface. This arrangement transforms the sliding friction at the connection between the first annular cavity 51 and the second annular cavity 53 into rolling friction, thereby reducing the friction between the drive cylinder 4311 and the mirror barrel 1.
[0039] Furthermore, the fixed base 21 has a groove at the point where it abuts against the drive cylinder 4311. The groove extends circumferentially along the drive cylinder 4311 to accommodate multiple steel balls and allow multiple steel balls to roll. Lubricating oil or grease is added in the annular cavity to further improve the lubrication effect.
[0040] In an embodiment of this utility model, the zoom assembly 3 further includes a slider 32, which is fixedly connected to the mounting base 31 and slidably disposed within the guide hole 11 in the front-back direction; the protrusion 4313 passes through the slider 32 within the guide hole 11 and is fixedly connected to the mounting base 31. This serves to limit the position of the mounting base 31 and the zoom lens assembly.
[0041] In this embodiment of the invention, a sleeve 33 is embedded on the surface of the slider 32; one end of the protrusion 4313 is threadedly connected to the sleeve 33 and the mounting base 31 in sequence, and the other end of the protrusion 4313 is slidably engaged with the drive groove 4312. The diameter of the protrusion 4313 gradually increases from the inside to the outside of the sleeve 33. Thus, the diameter of the end of the protrusion 4313 that is slidably engaged with the drive groove 4312 is larger, the contact area with the drive groove 4312 is larger, and the transmission effect is more stable; the slider 32 is set in the guide hole 11, and its volume is small. The sleeve 33 embedded on its surface increases the contact area, which not only makes the transmission effect more stable but also improves the service life of the slider 32; the diameter of the end of the protrusion 4313 that is connected to the mounting base 31 is even smaller, which has a smaller volume in the limited space of the installation channel, making it easier to install the zoom lens assembly.
[0042] In this embodiment of the present invention, two zoom components 3 are provided, and the two mounting seats 31 are spaced apart in the front-to-back direction; the inner wall surface of the drive cylinder 4311 is provided with two drive grooves 4312 arranged sequentially in the front-to-back direction, and the distance between the two drive grooves 4312 in the circumferential direction of the drive cylinder 4311 gradually increases or decreases in the front-to-back direction; two protrusions 4313 are provided, and the two protrusions 4313 are fixedly connected to the two mounting seats 31 respectively, and are slidably engaged with the two drive grooves 4312 respectively, so that the two zoom components 3 move closer or further apart when the two mounting seats 31 are moved.
[0043] Specifically, both drive slots 4312 are spirally arranged, and the pitch of the two drive slots 4312 is different, so that when the drive cylinder 4311 rotates, it drives the two zoom lens groups to move closer or further apart, thereby achieving zoom.
[0044] In one embodiment, mounting base 21 and mounting base 31 have mounting grooves 55 on their opposite sides; the fixing assembly 2 and / or zoom assembly 3 also include clamping members for clamping and fixing the fixed lens group or zoom lens group in the corresponding mounting groove 55. Thus, the clamping members of the fixing assembly 2 and the zoom assembly 3 clamp the fixed lens group and zoom lens group from both ends of the lens barrel 1, simplifying the structure. During installation, the fixed lens group and zoom lens group are directly inserted from both sides of the lens barrel 1 and fixed using the clamping members, reducing the space reserved for lens assembly installation and decreasing the volume of the lens barrel 1.
[0045] The pressure holding component includes a pressure ring 56, which is annular and made of metal or plastic. The pressure ring 56 is threaded or snap-fitted into the groove of the mounting groove 55.
[0046] This utility model also proposes an automatic zoom lens, which includes a fixed lens group, at least one zoom lens group, and the zoom lens barrel 100 as described above. The specific structure of the zoom lens barrel 100 is as described in the above embodiments. Since the automatic zoom lens adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The fixed lens group is mounted on the mounting base 21; the zoom lens group is correspondingly mounted on the mounting base 31.
[0047] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A zoom lens barrel, characterized in that, include: The lens barrel has a mounting channel that extends in the front-to-back direction; The fixing component includes a fixing seat fixedly disposed at the front end of the lens barrel, the fixing seat being used to install and fix the lens assembly; At least one zoom assembly includes a mounting base movably disposed within the mounting channel in a front-to-back direction, the mounting base for mounting a zoom lens group, such that during its movement, the zoom lens group moves closer to or further away from a fixed lens group; and... An electric drive assembly is driven to connect to the mounting base.
2. The zoom lens barrel as described in claim 1, characterized in that, The electric drive assembly includes: A drive motor is disposed on the outer side wall of the lens barrel, and a drive gear is disposed on the output shaft of the drive motor; A potentiometer is disposed on the outer wall of the lens barrel and spaced circumferentially from the drive motor along the lens barrel; a driven gear is disposed on the rotating shaft of the potentiometer; and, The transmission assembly includes a connecting portion and a drive rack arranged circumferentially along the lens barrel. The drive rack meshes with the drive gear and the driven gear. The connecting portion connects the drive rack to the mounting base.
3. The zoom lens barrel as described in claim 2, characterized in that, A guide hole is provided on the wall of the installation channel, and the guide hole extends along the front-back direction; The connecting part includes: A drive cylinder, sleeved outside the lens barrel and coaxially arranged with the lens barrel, rotates along an axis extending in the front-rear direction. At least one drive groove is formed on the inner wall of the drive cylinder, extending in the front-rear direction, with the front end and rear end of the drive groove offset circumferentially from each other along the lens barrel. The drive rack is provided on the outer wall of the drive cylinder; and... At least one protrusion, one end of which is fixedly connected to the mounting base, and the other end of which extends through the guide hole into the drive groove, so as to drive the mounting base to move back and forth when the drive cylinder rotates.
4. The zoom lens barrel as described in claim 3, characterized in that, The rear end face of the drive cylinder is at least partially inclined to form a first pressing surface. The rear end face of the drive cylinder abuts against the housing of the drive motor. The drive cylinder, the mirror cylinder, and the housing of the drive motor together define a first annular cavity at the first pressing surface. A first lubricating element is provided in the first annular cavity to abut against the first pressing surface, and the connection of the first annular cavity is lubricated when the drive cylinder rotates. And / or, The front end face of the drive cylinder is at least partially inclined to form a second pressing surface. The front end face of the drive cylinder abuts against the fixed base. The drive cylinder, the mirror cylinder, and the fixed base together define a second annular cavity. A second lubricating element is provided in the second annular cavity to abut against the second pressing surface, and lubricates the connection of the second annular cavity when the drive cylinder rotates.
5. The zoom lens barrel as described in claim 4, characterized in that, Both the first lubricating element and the second lubricating element include a plurality of steel balls, and the plurality of steel balls abut against the first pressing surface or the second pressing surface.
6. The zoom lens barrel as described in claim 3, characterized in that, The zoom assembly also includes a slider, which is fixedly connected to the mounting base and is slidably disposed in the guide hole in the front-back direction; The protrusion passes through the slider inside the guide hole and is fixedly connected to the mounting base.
7. The zoom lens barrel as described in claim 6, characterized in that, A sleeve is embedded in the surface of the slider; One end of the protrusion is threadedly connected to the sleeve and the mounting base in sequence, and the other end of the protrusion is slidably engaged with the drive groove. The diameter of the protrusion gradually increases in the direction from the inside to the outside of the sleeve.
8. The zoom lens barrel as described in any one of claims 3-7, characterized in that, Two zoom components are provided, and the two mounting bases are spaced apart along the front-to-back direction; The inner wall of the drive cylinder has two drive grooves arranged sequentially in the front-to-back direction. The distance between the two drive grooves in the circumferential direction of the drive cylinder gradually increases or decreases in the front-to-back direction. The protrusion is provided in two parts, which are fixedly connected to two mounting bases and slidably engaged with two drive slots, so that the two zoom components move closer or further apart when the two mounting bases are moved.
9. The zoom lens barrel as described in claim 1, characterized in that, The fixed base and the mounting base are provided with mounting grooves on their opposite sides; The fixing component and / or the zoom component further includes a holding member, which is used to hold and fix the fixed lens group or the zoom lens group in the corresponding mounting groove.
10. An automatic zoom lens, characterized in that, include: The zoom lens barrel as described in any one of claims 1-9; The fixed lens assembly is installed on the fixed base; as well as, At least one zoom lens assembly is mounted on the mounting base.