Optical zoom lens and imaging apparatus

Abstract

The invention discloses an optical zoom lens and camera shooting equipment, and relates to the technical field of optical zoom, the optical zoom lens comprises a plurality of lens groups and a magnetic driving structure, the plurality of lens groups are movably arranged along a first direction, the magnetic driving structure comprises a plurality of induction coils, two magnet yokes and two magnets, and the plurality of induction coils are arranged in the first direction. The two magnet yokes are arranged in a spaced mode, each magnet corresponds to one magnet yoke to form a magnetic field, each induction coil is arranged on one lens group, each induction coil is provided with two magnetic force induction parts arranged in a spaced mode, and each magnetic force induction part is located in one magnetic field. When the induction coils are electrified to enable the two magnets to generate electromagnetic action, the induction coils can move relative to the magnets in the first direction so as to drive the corresponding lens groups to move. Through the arrangement, the driving force of the magnetic driving structure is enhanced, and the small size of the magnetic driving structure is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of optical zoom, and in particular to an optical zoom lens and a camera device. Background Art

[0002] With the rapid development of high-tech, security optical zoom lenses have been widely used, and stepper motors are widely used in the automatic zoom and focus of optical zoom lenses. The existing stepper motor drive mode has low speed, high power consumption, is easily affected by electromagnetic interference and noise, and has poor wear resistance. At the same time, the existing position sensing method adopts open-loop control, which can only sense one position through PI, has low control accuracy, and is prone to undesirable phenomena such as loss of step.

[0003] However, the existing optical zoom lens driving structure requires a magnetic magnetic driving structure to drive each lens group, and in order to ensure the driving force of the magnetic driving structure on the lens group, the volume of the magnet and the yoke needs to be increased, thereby increasing the required cost and the required movement space. Summary of the invention

[0004] The main purpose of the present invention is to provide an optical zoom lens and a camera device, aiming to improve the problem that the existing optical zoom lens has a driving structure in which the magnet and the yoke are too large in size, resulting in excessive cost and movement space requirements.

[0005] To achieve the above object, the optical zoom lens provided by the present invention comprises: A plurality of lens groups, wherein the plurality of lens groups are movably arranged along a first direction; and The magnetic driving structure includes a plurality of induction coils, two yokes and two magnets. The two yokes are arranged at intervals, and each magnet is arranged corresponding to a yoke to form a magnetic field. Each induction coil is arranged on one lens group, and each induction coil has two magnetic induction parts arranged at intervals. Each magnetic induction part is in a magnetic field. When each induction coil is energized to generate electromagnetic action between the two magnets, the induction coil can move relative to the magnet along a first direction to drive the corresponding lens group to move.

[0006] In one embodiment, each of the magnetic yokes comprises: Two first yoke segments are both extended along the first direction and spaced apart in the second direction, and one end of the two first yoke segments in the first direction is connected; and, A second yoke segment is provided on one side of the two first yoke segments in the first direction and connects the other ends of the two first yoke segments in the first direction; Wherein, the magnet is located between two corresponding first yoke sections and is connected to one of the first yoke sections.

[0007] In one embodiment, the winding center of each of the induction coils is extended along the first direction and is wound around the circumference of the first yoke segments corresponding to the two yokes, and the magnetic force sensing portion includes a portion of the induction coil; wherein: The two magnets are arranged on a corresponding first yoke section of the yoke, so that the two magnets are located inside the winding of the induction coil; or, The two magnets are arranged on the other first yoke section of the corresponding yoke, so that the two magnets are located outside the winding of the induction coil.

[0008] In one embodiment, the two magnetic yokes are spaced apart from each other in the third direction.

[0009] In one embodiment, the magnetic poles of the two magnets are arranged to repel each other.

[0010] In one embodiment, the optical zoom lens further includes a plurality of position determination structures, each of the position determination structures including a magnetic grid and a magnetic sensor, one of the magnetic grid and the magnetic sensor being fixedly arranged, and the other being arranged on one of the lens groups, the magnetic grid extending along a first direction, the magnetic sensor being movably arranged along the first direction relative to the magnetic grid, and the magnetic sensor being used to detect changes in the magnetic force of the magnetic grid during its movement to determine the position of the lens group.

[0011] In one embodiment, the optical zoom lens further includes a guide structure, wherein the guide structure is movably connected to the lens group to guide the movement of the lens group along a first direction.

[0012] In one embodiment, the lens group is provided with a through hole along the first direction; The guiding structure comprises: Mounting bracket to fix the mounting arrangement; and, A guide rod is extended along a first direction and is arranged on the mounting seat, and the guide rod is arranged through the through hole to slideably cooperate with the through hole.

[0013] In one embodiment, the optical zoom lens further includes a lens barrel, and the lens barrel is extended along a first direction; The plurality of lens groups and the magnetic driving structure are all arranged in the lens barrel.

[0014] The present invention also provides a camera device, comprising the above-mentioned optical zoom lens.

[0015] In the technical solution of the present invention, when it is necessary to drive any lens group to move along the first direction, the corresponding induction coil is energized. Since the induction coil has two magnetic induction parts arranged at intervals, and each magnetic induction part is in a magnetic field, when the induction coil is energized and electromagnetically interacts with the two magnets, the two magnets can simultaneously magnetically drive the corresponding magnetic induction parts, and the directions of the magnetic forces received by the two magnetic induction parts are arranged in the same direction, so that the two magnets drive the induction coil to move in the first direction, thereby making the corresponding lens group move synchronously along the first direction. In this way, the two yokes and the two magnets are used to jointly drive the induction coil to move in the first direction, thereby driving the corresponding lens group to move in the first direction. The design of double magnets and double yokes can further improve the magnetic field strength of the magnetic drive structure without increasing the volume of the magnets and the volume of the yokes to reduce the installation space of the magnets and the yokes, and strengthen the driving force of the magnetic drive structure. In addition, one magnetic drive structure is used to drive multiple lens groups to move, so as to further ensure the small volume of the magnetic drive structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 A schematic structural diagram of an embodiment of an optical zoom lens provided by the present invention; Figure 2 for Figure 1 A schematic structural diagram of an embodiment of a magnetic drive structure; Figure 3 for Figure 1 A structural schematic diagram of another embodiment of the magnetic drive structure; Figure 4 for Figure 1 Schematic diagram of the structure of the lens barrel of the medium optical zoom lens.

[0018] Description of Figure Numbers: 100. Optical zoom lens; 1. Lens group; 2. Magnetic drive structure; 21. Induction coil; 22. Magnetic yoke; 221. First yoke section; 222. Second yoke section; 23. Magnet; 3. Position determination structure; 31. Magnetic grid; 32. Magnetic sensor; 4. Guide structure; 41. Guide rod; 5. Lens barrel.

[0019] 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

[0020] 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.

[0021] 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 in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0022] 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 limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy 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 this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] The present invention provides an optical zoom lens, which aims to improve the problem that the magnet and the yoke of the driving structure of the existing optical zoom lens are too large in volume, resulting in too large a required cost and too large a required movement space.

[0024] See also Figure 1In one embodiment of the present invention, the optical zoom lens 100 includes a plurality of lens groups 1 and a magnetic driving structure 2. The plurality of lens groups 1 are all movably arranged along a first direction. The magnetic driving structure 2 includes a plurality of induction coils 21, two magnetic yokes 22 and two magnets 23. The two magnetic yokes 22 are arranged at intervals. Each magnet 23 is arranged corresponding to a magnetic yoke 22 to form a magnetic field. Each of the induction coils 21 is arranged on one of the lens groups 1, and each of the induction coils 21 has two magnetic force sensing parts arranged at intervals. Each of the magnetic force sensing parts is in a magnetic field. When each of the induction coils 21 is energized to generate an electromagnetic effect with the two magnets 23, the induction coils 21 can move relative to the magnets 23 along the first direction to drive the corresponding lens group 1 to move.

[0025] In the technical solution of the present invention, when it is necessary to drive any of the lens groups 1 to move along the first direction, the corresponding induction coil 21 is energized. Since the induction coil 21 is at least partially located in the two magnetic fields, when the induction coil 21 is energized to generate electromagnetic action with the two magnets 23, the two magnets 23 can simultaneously magnetically drive the corresponding magnetic sensing parts, and the directions of the magnetic forces received by the two magnetic sensing parts are arranged in the same direction, so that the two magnets 23 drive the induction coil 21 to move in the first direction, thereby making the corresponding lens group 1 move synchronously along the first direction. In this arrangement, the two yokes 22 and the two magnets 23 are used to jointly drive the induction coil 21 to move along the first direction, thereby driving the corresponding lens group 1 to move along the first direction. The design of the double magnets 23 and the double yokes 22 can further improve the magnetic field strength of the magnetic drive structure 2 without increasing the volume of the magnets 23 and the yokes 22 and reducing the installation space of the magnets 23 and the yokes 22, thereby strengthening the driving force of the magnetic drive structure 2, and using one magnetic drive structure 2 to drive multiple lens groups 1 to move, so as to further ensure the small volume of the magnetic drive structure 2.

[0026] Further, in an embodiment of the present invention, each of the yokes 22 includes two first yoke sections 221 and one second yoke section 222, the two first yoke sections 221 are both extended in the first direction and spaced apart in the second direction, the two first yoke sections 221 are connected at one end in the first direction, the second yoke section 222 is provided on one side of the two first yoke sections 221 in the first direction and connects the other ends of the two first yoke sections 221 in the first direction, and the magnet 23 is located between the corresponding two first yoke sections 221 and connects one of the first yoke sections 221. In this way, the two first yoke sections 221 can limit the direction of the magnetic field generated by the magnet 23 in the second direction, and the cooperation of the second yoke section 222 and the two first yoke sections 221 can limit the direction of the magnetic field generated by the corresponding magnet 23 in the first direction, and the three yoke sections cooperate with each other to limit the magnetic field of the corresponding magnet 23 within the three yoke sections.

[0027] It should be noted that the present invention does not limit the arrangement of the two magnetic yokes 22. In one embodiment of the present invention, the two magnetic yokes 22 are spaced apart in the second direction. Correspondingly, in order to enable the two magnetic sensing parts of each induction coil 21 to be respectively located in the magnetic fields of the two magnets 23, in this embodiment, the winding center of each induction coil 21 is extended along the first direction and is wound around the circumference of the two corresponding first yoke sections 221 of the two magnetic yokes 22. The magnetic sensing part includes a part of the induction coil 21. At this time, in the induction coil 21, the current direction of the induction coil 21 passing through the two magnetic fields is the same. Therefore, the magnetic pole directions of the two magnets 23 are arranged in the same direction. With such arrangement, when it is necessary to drive any of the lens groups 1 to move along the first direction, current is passed into the corresponding induction coil 21. Since the induction coil 21 is at least partially located in the two magnetic fields, when the induction coil 21 is energized to generate electromagnetic interaction with the two magnets 23, the two magnets 23 can jointly magnetically drive the induction coil 21. Moreover, since the currents flowing through the two magnetic fields of the induction coil 21 are in the same direction, and the directions of the magnetic flux lines of the two magnetic fields are in the same direction, the driving directions of the two magnetic fields on the induction coil 21 are also arranged in the same direction, so that the two magnets 23 drive the induction coil 21 to move in the first direction, thereby causing the corresponding lens group 1 to move in the first direction.

[0028] In another embodiment of the present invention, the two magnetic yokes 22 are spaced apart in the third direction. Correspondingly, in order to enable the two magnetic sensing parts of the induction coil 21 to be respectively in two magnetic fields, in this embodiment, the winding center of each induction coil 21 is extended along the first direction and is wound around the circumference of the corresponding first magnetic yoke section 221 of the two magnetic yokes 22. The magnetic sensing part includes a part of the induction coil 21. At this time, in the induction coil 21, the current directions of the induction coil 21 passing through the two magnetic fields are opposite. Therefore, the magnetic pole directions of the two magnets 23 are set to repel each other. With such arrangement, when it is necessary to drive any of the lens groups 1 to move along the first direction, current is passed into the corresponding induction coil 21. Since the induction coil 21 is at least partially located in the two magnetic fields, when the induction coil 21 is energized to generate electromagnetic interaction with the two magnets 23, the two magnets 23 can magnetically drive the induction coil 21 at the same time. Moreover, since the directions of the currents flowing through the induction coil 21 in the two magnetic fields are opposite, and the directions of the magnetic flux lines in the two magnetic fields are opposite, the driving directions of the two magnets 23 on the induction coil 21 are arranged in the same direction, so that the two magnets 23 drive the induction coil 21 to move in the first direction, thereby causing the corresponding lens group 1 to move in the first direction.

[0029] Specifically, in this embodiment, the two magnetic yokes 22 are arranged at intervals in the third direction.

[0030] It should also be noted that the present invention also does not limit the induction coil 21 to be wound around the specific two first yoke sections 221. For example, in another embodiment of the present invention, when the two yokes 22 are spaced apart in the second direction, if the induction coil 21 is wound around two of the two yokes 22 that are far away from each other, at this time, the current directions of the induction coil 21 passing through the two magnetic fields are opposite. At this time, the magnetic pole directions of the two magnets 23 should also be set in opposite directions.

[0031] In another embodiment of the present invention, when the two magnetic yokes 22 are spaced apart in the third direction, if the induction coil 21 is wound around the two first magnetic yoke sections 221 of the two magnetic yokes 22 that are away from each other, at this time, the current directions of the induction coil 21 passing through the two magnetic fields are opposite, and therefore, the magnetic pole directions of the two magnets 23 should also be set to repel each other.

[0032] In other embodiments of the present invention, when the two magnetic yokes 22 are spaced apart in the third direction, the induction coil 21 can be wound around the first yoke segment 221 of one of the magnetic yokes 22 close to the other magnetic yoke 22 and the first yoke segment 221 of the other magnetic yoke 22 away from the magnetic yoke 22. The present invention does not impose any restrictions on this, and it can be selected according to needs during actual setting.

[0033] Specifically, in this embodiment, the induction coil 21 is wound around the circumference of the first yoke segments 221 corresponding to the two yokes 22 .

[0034] In addition, the present invention does not limit the relative position relationship between the induction coil 21 and the two magnets 23. Figure 2 In one embodiment of the present invention, the two magnets 23 are disposed on a corresponding first yoke segment 221 of the yoke 22 , so that the two magnets 23 are both located inside the winding of the induction coil 21 .

[0035] See also Figure 3 In another embodiment of the present invention, the two magnets 23 are disposed on the other first yoke segment 221 of the corresponding yoke 22 , so that the two magnets 23 are both located outside the winding of the induction coil 21 .

[0036] In another embodiment of the present invention, two magnets 23 are disposed on one of the corresponding yoke sections of the yoke 22 , and one of the magnets 23 is located inside the winding of the induction coil 21 , while the other magnet 23 is located inside the winding of the induction coil 21 .

[0037] Specifically, the relative positions of the two magnets 23 and the induction coil 21 can be selected according to the requirements, and the present invention does not impose any limitation on this.

[0038] Furthermore, in the process of the magnetic driving structure 2 driving the lens group 1 to move along the first direction, in order to accurately determine the specific moving distance of the lens group 1, in one embodiment of the present invention, the optical zoom lens 100 further includes a plurality of position determination structures 3, each of which includes a magnetic grid 31 and a magnetic sensor 32, one of which is fixedly arranged, and the other is arranged at one of the lens groups 1, the magnetic grid 31 is extended along the first direction, and the magnetic sensor 32 is movable relative to the magnetic grid 31 along the first direction, and the magnetic sensor 32 is used to detect the change of the magnetic force of the magnetic grid 31 during its movement to determine the position of the lens group 1. In this way, the position of the magnetic sensor 32 relative to the magnetic grid 31 can indirectly reflect the position of the corresponding lens group 1, and the actual position of the lens group 1 can be accurately detected through the relative movement between the magnetic sensor 32 and the magnetic grid 31.

[0039] At the same time, through the cooperation of the magnetic driving structure 2 and the position determination structure 3, a position detection accuracy of less than 1 um can also be achieved.

[0040] It should be noted that in the present invention, the magnetic grid 31 includes a plurality of magnetic signal bars arranged at intervals in the first direction, the spacing between any two adjacent magnetic signal bars is equal, and the polarities are arranged in an alternating manner, and the magnetic sensor 32 includes two types: a dynamic magnetic sensor (speed response magnetic sensor) and a static magnetic sensor (flux response magnetic sensor). The dynamic magnetic sensor 32 has an output winding, and can only output a signal when the magnetic sensor 32 and the magnetic grid 31 produce relative motion. The static magnetic sensor has two windings, an excitation winding and an output winding, and can also output a signal when it is relatively stationary with the magnetic grid 31. The static magnetic sensor 32 is a multi-gap iron core with unequal effective cross-sections stacked by iron-nickel alloy sheets. The excitation winding acts as a magnetic switch. When an alternating current is applied to it, the magnetic circuit section with a smaller cross-section of the iron core is excited twice a week to produce magnetic saturation, so that the magnetic lines of force generated by the magnetic grid 31 cannot pass through the iron core. Only when the excitation current passes through zero twice a week, the iron core is not saturated, and the magnetic lines of force of the magnetic grid 31 can pass through the iron core. At this time, the output winding has an induced potential output. Its frequency is twice the frequency of the excitation current, and the amplitude of the output voltage is proportional to the magnetic flux entering the core, that is, it is related to the position of the magnetic sensor 32 relative to the magnetic grid 31. The magnetic sensor 32 is made into multiple gaps to increase the output, and its output signal is the average value of the signals obtained from multiple gaps, so the output accuracy can be improved.

[0041] Of course, the present invention does not limit the specific activities of the magnetic grid 31 and the magnetic sensor 32. In one embodiment of the present invention, the magnetic grid 31 is fixed, and the magnetic sensor 32 moves along the first direction relative to the magnetic grid 31; in another embodiment of the present invention, the magnetic sensor 32 is fixed, and the magnetic grid 31 moves along the first direction relative to the magnetic sensor 32.

[0042] It should also be noted that, in the present invention, a closed-loop control method is adopted to correspond to the magnetic grid 31 and the magnetic sensor 32, so that the position of the lens group 1 can be detected in real time during the movement of the lens group 1 along the first direction, and the position of the lens group 1 can be adjusted in real time according to the displacement difference between the actual position of the lens group 1 and the target position, without being limited by the physical accuracy and wear accuracy of the magnetic drive structure 2 itself, and when multiple magnetic drive structures 2 drive the mobile group to move at high speed, they will not be affected by the difference in stopping accuracy, so that the lens group 1 can accurately reach the target position required for zooming or focusing, so as to realize multi-position sensing detection and accurately sense any position driven by the magnetic drive structure 2.

[0043] In addition, in order to further improve the angle accuracy of the lens group 1 during the movement along the first direction, in an embodiment of the present invention, the optical zoom lens 100 further includes a guide structure 4, which is movably connected to the lens group 1 to guide the movement of the lens group 1 along the first direction. The setting of the guide structure 4 can further limit the specific movement angle of the lens group 1 in the first direction, so as to avoid position deviation of the lens group 1 during the movement along the first direction, thereby affecting the imaging effect of the optical zoom lens 100.

[0044] It should be noted that the present invention does not limit the specific structural form of the guide structure 4. In one embodiment of the present invention, the lens group 1 is provided with a through hole along the first direction, and the guide structure 4 includes a mounting seat and a guide rod 41. The mounting seat is fixedly arranged, and the guide rod 41 is extended along the first direction and arranged on the mounting seat, and the guide rod 41 passes through the through hole to slide with the through hole. With such an arrangement, when the lens group 1 moves along the first direction, the guide rod 41 can limit the specific moving direction of the lens group 1 to avoid position deviation of the lens group 1 during the moving process.

[0045] In another embodiment of the present invention, the guide structure 4 can also be configured as a linear guide rail extending along the first direction, the linear guide rail is fixedly arranged, and a slider is arranged on the lens group 1 corresponding to the linear guide rail, and the slider is slidably connected to the linear guide rail along the first direction. In this way, the cooperation between the linear guide rail and the slider can also limit the specific movement direction of the lens group 1, so that the lens group 1 can move accurately along the first direction to avoid position deviation.

[0046] Similarly, the present invention does not limit the number of the guide structures 4. In one embodiment of the present invention, one guide structure 4 may be provided; and in another embodiment of the present invention, a plurality of guide structures 4 may be provided, and the plurality of guide structures 4 are spaced apart on the circumference of the lens group 1, and the plurality of guide structures 4 may also jointly locate the movable angle of the lens group 1 to further accurately determine the movable direction of the lens group 1.

[0047] Of course, in order to ensure the working environment of the magnetic drive structure 2 and to prevent the lens group 1 from being affected by the environment and causing deviation during the activity, please refer to Figure 4 In a further embodiment of the present invention, the optical zoom lens 100 further comprises a lens barrel 5, the lens barrel 5 is extended along the first direction, the magnetic yoke 22 is fixedly installed in the lens barrel 5, and one of the magnetic grid 31 and the magnetic sensor 32 is fixedly connected to the lens barrel 5. In this way, the lens barrel 5 provides an installation reference for one of the magnetic yoke 22, the magnetic grid 31 and the magnetic sensor 32 to ensure the working stability of the magnetic driving structure 2 and the position determination structure 3.

[0048] The present invention further proposes a camera device, which includes an optical zoom lens 100. The specific structure of the optical zoom lens 100 refers to the above-mentioned embodiment. Since the camera device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0049] The above description is only an exemplary 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 technical 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. An optical zoom lens, characterized in that: include: A plurality of lens groups, wherein the plurality of lens groups are movably arranged along a first direction; as well as, The magnetic driving structure includes a plurality of induction coils, two yokes and two magnets. The two yokes are arranged at intervals, and each magnet is arranged corresponding to a yoke to form a magnetic field. Each induction coil is arranged on one lens group, and each induction coil has two magnetic induction parts arranged at intervals. Each magnetic induction part is in a magnetic field. When each induction coil is energized to generate electromagnetic action between the two magnets, the induction coil can move relative to the magnet along a first direction to drive the corresponding lens group to move.

2. The optical zoom lens according to claim 1, wherein: Each of the magnetic yokes comprises: Two first yoke segments are both extended along the first direction and spaced apart in the second direction, and one end of the two first yoke segments in the first direction is connected; and, A second yoke segment is provided on one side of the two first yoke segments in the first direction and connects the other ends of the two first yoke segments in the first direction; Wherein, the magnet is located between two corresponding first yoke sections and is connected to one of the first yoke sections.

3. The optical zoom lens according to claim 2, wherein: The winding center of each of the induction coils is extended along the first direction and is wound around the circumference of the first yoke segments corresponding to the two yokes, and the magnetic force sensing portion includes a portion of the induction coil; wherein: The two magnets are arranged on a corresponding first yoke section of the yoke, so that the two magnets are located inside the winding of the induction coil; or, The two magnets are arranged on the other first yoke section of the corresponding yoke, so that the two magnets are located outside the winding of the induction coil.

4. The optical zoom lens according to claim 2, wherein: The two magnetic yokes are spaced apart from each other in the third direction.

5. The optical zoom lens according to claim 4, wherein: The magnetic poles of the two magnets are arranged to repel each other.

6. The optical zoom lens according to claim 1, wherein: The optical zoom lens also includes a plurality of position determination structures, each of which includes a magnetic grid and a magnetic sensor. One of the magnetic grid and the magnetic sensor is fixedly arranged, and the other is arranged in one of the lens groups. The magnetic grid extends along a first direction, and the magnetic sensor is movably arranged along the first direction relative to the magnetic grid. The magnetic sensor is used to detect the change of the magnetic force of the magnetic grid during its movement to determine the position of the lens group.

7. The optical zoom lens according to claim 1, wherein: The optical zoom lens further comprises a guide structure, wherein the guide structure is movably connected to the lens group to guide the movement of the lens group along a first direction.

8. The optical zoom lens according to claim 7, wherein: The lens group is provided with a through hole along the first direction; The guiding structure comprises: Mounting bracket to fix the mounting arrangement; and, A guide rod is extended along a first direction and is arranged on the mounting seat, and the guide rod is arranged through the through hole to slideably cooperate with the through hole.

9. The optical zoom lens according to claim 1, wherein: The optical zoom lens further comprises a lens barrel, and the lens barrel is extended along a first direction; The plurality of lens groups and the magnetic driving structure are all arranged in the lens barrel.

10. A camera device, characterized in that Comprising the optical zoom lens as claimed in any one of claims 1 to 9.

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