VCM structure, lens and shooting equipment

Abstract

The present invention discloses a VCM structure, a lens and a shooting device, and relates to the technical field of VCM structure, wherein the VCM structure includes a magnetic circuit structure and a coil assembly, wherein the magnetic circuit structure includes a yoke assembly and a magnet assembly, wherein the yoke assembly forms an installation cavity opening toward a first direction, wherein the magnet assembly includes a plurality of magnet groups arranged in sequence along a second direction, wherein each magnet group includes four magnets arranged in sequence along the second direction, wherein the magnetizing directions of the four magnets are arranged in a Halbach array and are all perpendicular to the first direction, wherein the magnetizing directions of two magnets are opposite and consistent with the second direction, wherein the coil assembly is movably arranged in the installation cavity along the second direction, and when the coil assembly is energized and interacts with the magnet assembly, the coil assembly can move in the second direction. The VCM structure in this scheme has high magnetic field strength, uniform magnetic field distribution, and can change the stroke according to demand, and has wide applicability.

Description

Technical Field

[0001] This invention relates to the field of lens technology, and in particular to a VCM structure, lens, and shooting device. Background Art

[0002] A VCM (Voice Coil Motor) is a type of motor that uses electromagnetic principles to generate linear or rotary motion. In devices such as digital cameras and mobile phone cameras, VCMs are used to drive the lens for fast and precise focusing. By adjusting the position of the lens, a VCM can make the image clearly focused on the sensor, offering advantages such as high precision, fast response, and low noise.

[0003] In existing VCM structures, the magnets in the magnetic circuit components are usually made of a single large magnet. However, the magnetic field distribution of a large magnet is characterized by strong magnetic poles at both ends and weaker magnetic poles in the middle. The magnetic field distribution is not uniform enough, and the adaptability of a large magnet is poor. When dealing with lenses of different specifications, magnets of different specifications need to be manufactured according to the requirements, which increases the manufacturing cost. Summary of the Invention

[0004] The main objective of this invention is to propose a VCM structure, lens, and shooting device, aiming to solve the problems of uneven magnetic field distribution and poor adaptability of current VCM structures.

[0005] To achieve the above objectives, the present invention proposes a VCM structure, including a magnetic circuit structure and a coil assembly. The magnetic circuit structure includes a yoke assembly and a magnet assembly. The yoke assembly forms a mounting cavity opening in a first direction. The magnet assembly is disposed within the mounting cavity. The magnet assembly includes multiple magnet groups arranged sequentially along a second direction. Each magnet group includes four magnets arranged sequentially along the second direction. The magnetization directions of the four magnets are arranged in a Halebeck array and are all perpendicular to the first direction. Among them, the magnetization directions of two magnets are opposite and consistent with the second direction. The coil assembly is movably disposed within the mounting cavity along the second direction. When the coil assembly is energized and interacts with the magnet assembly, the coil assembly can move along the second direction.

[0006] In one embodiment, the magnetic yoke assembly is formed by a plurality of magnetic yoke plates, and the magnet assembly is fixedly mounted on the magnetic yoke plates facing the third direction.

[0007] The VCM structure also includes:

[0008] A guide rail, extending along a second direction, is disposed on one of the magnetic yoke plates; and...

[0009] A mounting base is provided for fixing the coil assembly, and a slider is provided on the side of the mounting base facing the guide rail for sliding engagement with the guide rail.

[0010] In one embodiment, the coil assembly includes two coil units spaced apart in a third direction, and a liquid cooling plate is disposed between the two coil units. The liquid cooling plate is fixed on the mounting base and has a cooling flow path that is folded and bent to dissipate heat from the two coil units.

[0011] In one embodiment, a magnetic grating is further provided on the corresponding magnetic yoke plate, the magnetic grating extending along the second direction, and a reading head corresponding to the magnetic grating is also provided on the mounting base, so that during the relative movement of the mounting base and the magnetic yoke plate, the reading head calculates the displacement relative to the magnetic grating based on the magnetic field at different positions of the magnetic grating.

[0012] In one embodiment, the VCM structure further includes a plurality of photoelectric switches, which are spaced apart on the magnetic yoke plate along a second direction;

[0013] The mounting base is also provided with a light-blocking plate corresponding to the photoelectric switch, so that during the relative movement of the mounting base and the magnetic yoke plate, the light-blocking plate can move to the light emission point of the photoelectric switch, thereby triggering the corresponding photoelectric switch to work.

[0014] In one embodiment, the corresponding magnetic yoke plate is further provided with a buffer portion, which is used to abut against the end of the mounting base.

[0015] In one embodiment, two magnet components are provided, and the two magnet components are respectively disposed on the inner surfaces of two magnetic yoke plates facing each other from the third direction.

[0016] In one embodiment, the coil assembly is used to receive a three-phase alternating current.

[0017] The present invention also proposes a lens comprising the aforementioned VCM structure. The VCM structure includes a magnetic circuit structure and a coil assembly. The magnetic circuit structure includes a yoke assembly and a magnet assembly. The yoke assembly forms a mounting cavity opening in a first direction. The magnet assembly is disposed within the mounting cavity. The magnet assembly includes multiple magnet groups arranged sequentially along a second direction. Each magnet group includes four magnets arranged sequentially along the second direction. The magnetization directions of the four magnets are arranged in a Halebeck array and are all perpendicular to the first direction. The magnetization directions of two magnets are opposite and consistent with the second direction. The coil assembly is movably disposed within the mounting cavity along the second direction. When the coil assembly is energized and interacts with the magnet assembly, the coil assembly can move along the second direction.

[0018] Furthermore, the present invention also proposes an imaging device, the imaging device including the above-mentioned lens, the lens including the above-mentioned VCM structure, the VCM structure including a magnetic circuit structure and a coil assembly, the magnetic circuit structure including a magnetic yoke assembly and a magnet assembly, the magnetic yoke assembly forming a mounting cavity opening towards a first direction, the magnet assembly being disposed within the mounting cavity, the magnet assembly including a plurality of magnet groups arranged sequentially along a second direction, each magnet group including four magnets arranged sequentially along the second direction, the magnetization direction of the four magnets being arranged in a Hellbeck array and all perpendicular to the first direction, wherein the magnetization directions of two magnets are opposite and consistent with the second direction, the coil assembly being movably disposed within the mounting cavity along the second direction, and when the coil assembly is energized and interacts with the magnet assembly, the coil assembly is able to move along the second direction.

[0019] The technical solution of this invention, by setting the magnetic circuit structure and the coil assembly, allows the coil assembly to move relative to the magnetic circuit structure when energized, thereby driving the adjustment lens group to move relative to the mounting cylinder, realizing the movement of the focusing system in the lens structure. Further, the coil assembly includes a magnetic yoke assembly and a magnet assembly, wherein the magnet assembly is composed of multiple magnet groups arranged in a Hellbeck array. This allows the magnet assembly to generate a more uniform and stronger magnetic field, thereby enabling rapid and stable movement of the coil assembly. Furthermore, by reasonably increasing or decreasing the number of magnet groups, the number of groups in the magnet assembly can be adjusted to change the zoom stroke corresponding to different specifications of the magnetic circuit structure, thus adapting to zoom systems with different strokes and improving the applicability of this structure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an embodiment of the VCM structure provided by the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the VCM structure with some mounting brackets removed;

[0023] Figure 3 for Figure 1 A schematic diagram of the VCM structure from another perspective;

[0024] Figure 4 for Figure 1Schematic diagram of the intermediate coil assembly;

[0025] Figure 5 for Figure 1 Schematic diagram of the liquid cooling plate in the middle;

[0026] Figure 6 for Figure 1 Partial magnetic field distribution diagram of the central magnet component.

[0027] Description of Figure Numbers:

[0028] 1000, VCM structure; 1, magnetic circuit structure; 11, magnetic yoke assembly; 111, mounting cavity; 112, magnetic yoke plate; 12, magnet assembly; 121, magnet; 2, coil assembly; 21, coil unit; 3, guide rail; 4, mounting base; 41, light shield; 5, liquid cooling plate; 51, cooling flow path; 6, magnetic grid; 7, reading head; 8, photoelectric switch; 9, buffer section.

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention 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.

[0032] Furthermore, if the embodiments of this invention 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. Thus, 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 invention.

[0033] A VCM (Voice Coil Motor) is a type of motor that uses electromagnetic principles to generate linear or rotary motion. In devices such as digital cameras and mobile phone cameras, VCMs are used to drive the lens for fast and precise focusing. By adjusting the position of the lens, a VCM can make the image clearly focused on the sensor, offering advantages such as high precision, fast response, and low noise.

[0034] In existing VCM structures, the magnets in the magnetic circuit components are usually made of a single large magnet. However, the magnetic field distribution of a large magnet is characterized by strong magnetic poles at both ends and weaker magnetic poles in the middle. The magnetic field distribution is not uniform enough, and the adaptability of a large magnet is poor. When dealing with lenses of different specifications, magnets of different specifications need to be manufactured according to the requirements, which increases the manufacturing cost.

[0035] The main objective of this invention is to propose a VCM structure, lens, and shooting device, aiming to solve the problems of uneven magnetic field distribution and poor adaptability of current VCM structures.

[0036] See also Figure 1 This invention proposes a VCM structure 1000, including a magnetic circuit structure 1 and a coil assembly 2. The magnetic circuit structure 1 includes a magnetic yoke assembly 11 and a magnet assembly 12. The magnetic yoke assembly 11 forms a mounting cavity 111 opening in a first direction. The magnet assembly 12 is disposed within the mounting cavity 111. The magnet assembly 12 includes multiple magnet groups arranged sequentially along a second direction. Each magnet group includes four magnets 121 arranged sequentially along the second direction. The magnetization direction of the four magnets 121 is arranged in a Halebeck array and is perpendicular to the first direction. Among them, the magnetization directions of two magnets 121 are opposite and consistent with the second direction. The coil assembly 2 is movably disposed within the mounting cavity 111 along the second direction. When the coil assembly 2 is energized and interacts with the magnet assembly 12, the coil assembly 2 can move along the second direction.

[0037] The technical solution of this invention, by setting the magnetic circuit structure 1 and the coil assembly 2, allows the coil assembly 2 to move relative to the magnetic circuit structure 1 when energized, thereby driving the adjustment lens group to move relative to the mounting cylinder, thus realizing the movement of the focusing system in the lens structure. Further, the coil assembly 2 includes a magnetic yoke assembly 11 and a magnet assembly 12, wherein the magnet assembly 12 is composed of multiple magnet groups arranged in a Hellbeck array. Thus, the magnet assembly 12 can generate a more uniform and stronger magnetic field, thereby enabling the coil assembly 2 to move quickly and smoothly. Furthermore, the magnet assembly 12, composed of four magnets 121 as a group, can change the zoom stroke corresponding to different specifications of the magnetic circuit structure 1 by reasonably increasing or decreasing the number of magnet groups, thereby adapting to zoom systems with different strokes and improving the applicability of this structure.

[0038] It should be noted that, please refer to Figure 6 In this scheme, the Hellbeck array is set to be linear, meaning that the magnetization direction of the magnets in the array alternates along the length of the array. For a standard four-segment linear Hellbeck array, the magnetization direction of each magnet will rotate 90 degrees clockwise or counterclockwise in sequence until the next cycle begins. This arrangement increases the strength and uniformity of the magnetic field, thereby enabling the coil assembly 2 to move quickly and smoothly.

[0039] It is understood that the second direction is orthogonal to the first direction, and the plane containing the magnetization direction of each of the magnets 121 is perpendicular to the first direction, thereby generating an Ampere force that can drive the coil to move in the second direction.

[0040] It is worth mentioning that since the magnetization direction is perpendicular between the two magnets 121, positioning components are needed to position each magnet 121, such as card slots or tape. This solution does not impose specific restrictions on the positioning components.

[0041] In order to limit the movement of the coil assembly 2, in one embodiment provided by the present invention, please refer to... Figure 2The magnetic yoke assembly 11 is formed by multiple magnetic yoke plates 112, and the magnet assembly 12 is fixedly mounted on the magnetic yoke plate 112 facing the third direction. The VCM structure 1000 also includes a guide rail 3 and a mounting base 4. The guide rail 3 extends along a second direction and is mounted on one of the magnetic yoke plates 112. The mounting base 4 is used to fix and mount the coil assembly 2. A slider is provided on the side of the mounting base 4 facing the guide rail 3 for sliding engagement with the guide rail 3. With this configuration, the coil assembly 2 can move along the guide rail 3, the structure is simple, and the stability of the device is improved. Specifically, the guide rail 3 is mounted on one of the magnetic yoke plates 112 facing the third direction. This configuration is more reasonable and facilitates the mounting base 4 in sending the coil assembly 2 into the mounting cavity 111.

[0042] It is worth mentioning that, in order to facilitate the subsequent maintenance and replacement of the coil assembly 2, in one embodiment of the present invention, the coil assembly 2 is detachably connected to the mounting base 4. Specifically, please refer to... Figure 1 and Figure 2 The mounting base 4 is provided with an extension and a disassembly part. The extension extends in a third direction, which facilitates the coil assembly 2 to be inserted into the mounting cavity 111. The coil assembly 2 can be detachably mounted on the extension through the disassembly part. Thus, by separating or combining the disassembly part and the extension part, the coil assembly 2 can be installed and removed.

[0043] Further, please refer to Figure 2 , Figure 4 and Figure 5 The coil assembly 2 includes two coil units 21 spaced apart in a third direction. A liquid cooling plate 5 is disposed between the two coil units 21 and fixed to the mounting base 4. The liquid cooling plate 5 has a cooling flow path 51, which is folded and bent to dissipate heat from the two coil units 21. This arrangement increases the contact area between the liquid cooling plate 5 and the coil units 21, improving heat dissipation. Specifically, the cooling flow path 51 has a connecting portion and a bending portion. Multiple bending portions are distributed at both ends of the liquid cooling plate 5 in a first direction and spaced apart in a second direction. The connecting portion alternately connects the bending portions at both ends, thereby making the cooling flow path 51 as long as possible within the liquid cooling plate 5, further improving heat dissipation efficiency.

[0044] It should be noted that this solution does not limit the specific implementation of the coil unit 21. In a preferred embodiment of this solution, the coil unit 21 is configured as a mounting plate with multiple mounting posts and multiple induction coils mounted on the multiple mounting posts. This configuration is highly adaptable and multiple induction coils can be installed as needed. In another embodiment of the present invention, the coil unit 21 is configured as an induction coil with a fixing member. This configuration is simple in structure and easy to assemble.

[0045] Furthermore, two magnet components 12 are provided, each disposed on the inner surface of two opposing magnetic yoke plates 112 facing each other from the third direction. This arrangement maximizes the use of the space inside the mounting cavity 111 and further enhances the magnetic field strength, accelerating the response speed of the focusing system. It is worth noting that the magnets 121 in the two magnet components 12 are arranged in the same magnetization direction, thereby superimposing the magnetic fields between the two magnet components 12.

[0046] To obtain the travel distance of the coil assembly 2, please refer to... Figure 3 A magnetic grating 6 is also provided on the corresponding magnetic yoke plate 112, extending along the second direction. A corresponding reading head 7 is also provided on the mounting base 4. During the relative movement of the mounting base 4 and the magnetic yoke plate 112, the reading head 7 calculates the displacement relative to the magnetic grating 6 based on the magnetic field at different positions of the magnetic grating 6. The working principle of the magnetic grating 6 and the reading head 7 is based on electromagnetic induction. When the reading head 7 moves along the magnetic grating 6, a corresponding voltage change is generated in the reading head 7 due to the change in magnetic field strength. By processing these changes, the position information can be determined very accurately, and it also has the characteristic of fast response speed. The autofocus system in a lens particularly relies on precise adjustment of the focus position and has high requirements for focusing speed, allowing users to capture the desired moment more quickly. The cooperative structure of the magnetic grating 6 and the reading head 7 perfectly meets these requirements.

[0047] To control the active position of the coil assembly 2, please refer to... Figure 3The VCM structure 1000 also includes multiple photoelectric switches 8, which are spaced apart along a second direction on the magnetic yoke plate 112. The mounting base 4 is also provided with light-blocking plates 41 corresponding to the photoelectric switches 8. During relative movement between the mounting base 4 and the magnetic yoke plate 112, the light-blocking plates 41 can move to the light emission point of the photoelectric switch 8, thereby triggering the corresponding photoelectric switch 8 to operate. When focusing the lens, the focusing positions corresponding to the lens group are fixed. By setting the photoelectric switches 8 and the light-blocking plates 41, the moving positions of the focusing system can be precisely controlled, achieving rapid response for lens focusing. It is worth mentioning that by appropriately widening the width of the light-blocking plates 41, the response time of the photoelectric switches 8 can be improved, increasing the error tolerance.

[0048] Specifically, in the embodiments provided by the present invention, the photoelectric switch 8 is disposed on the magnetic yoke plate 112 in the first direction, and the light-blocking plate 41 extends along the third direction. This arrangement is more reasonable in terms of spatial arrangement and facilitates the placement of the light-blocking plate 41 on the mounting base 4.

[0049] In one embodiment provided by the present invention, please refer to Figure 1 and Figure 2 The corresponding magnetic yoke plate 112 is also provided with a buffer portion 9, which abuts against the end of the mounting base 4. By providing the buffer portion 9, it prevents... The buffer portion 9 can play a role in buffering and shock absorption, avoiding sudden movements between multiple lens groups, thereby ensuring the stability and accuracy of the focusing process, and also avoiding collisions or excessive movements that could lead to collisions or damage to optical elements.

[0050] Furthermore, the coil assembly 2 is used to connect to a three-phase alternating current. With this configuration, by adjusting the frequency and amplitude of the three-phase alternating current, the speed and acceleration of the coil assembly 2 can be controlled, achieving smooth movement and rapid response. The smoothing characteristics of the three-phase alternating current reduce harmonic distortion, making the movement of the coil assembly 2 more stable, reducing vibration and noise. Simultaneously, it also reduces eddy current losses and resistive heating in the coil, improving system efficiency and lifespan.

[0051] The present invention also provides a lens, the lens including the above-described VCM structure 1000. Since the lens includes the VCM structure 1000, the specific structure of the VCM structure 1000 is as described in the above embodiments. Since the VCM structure 1000 of this 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.

[0052] The present invention also provides a shooting device, which includes the lens described above. Since the shooting device includes the lens, the specific structure of the lens is as described in the above embodiments. Because the lens of the shooting device 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.

[0053] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A VCM structure, characterized in that: include: A magnetic circuit structure, comprising a yoke assembly and a magnet assembly, wherein the yoke assembly forms an installation cavity opening toward a first direction, the magnet assembly is arranged in the installation cavity, the magnet assembly comprises a plurality of magnet groups sequentially arranged along a second direction, each of the magnet groups comprises four magnets sequentially arranged along the second direction, the magnetizing directions of the four magnets are arranged according to a Halbach array and are perpendicular to the first direction, wherein the magnetizing directions of two of the magnets are opposite and consistent with the second direction; and, A coil assembly is disposed in the installation cavity and moves along a second direction. When the coil assembly is energized and interacts with the magnet assembly, the coil assembly can move along the second direction. The yoke assembly is formed by a plurality of yoke plates, and the magnet assembly is fixed on the yoke plate in the third direction; The VCM structure also includes: a guide rail extending in the second direction, the guide rail being arranged on the outer side of the yoke plate in the third direction; and A mounting seat, used for fixing and mounting the coil assembly, wherein a sliding block is provided on a side of the mounting seat facing the guide rail so as to slide with the guide rail; The corresponding magnetic yoke plate is also provided with a magnetic grid, and the magnetic grid extends along the second direction. The mounting seat is also provided with a magnetic read head corresponding to the magnetic grid, so that during the relative movement of the mounting seat and the magnetic yoke plate, the magnetic read head calculates the displacement relative to the magnetic grid according to the magnetic field at different positions of the magnetic grid; The VCM structure further includes a plurality of photoelectric switches, wherein the plurality of photoelectric switches are arranged on the yoke plate in the first direction at intervals along the second direction; The mounting seat is also provided with a light shielding sheet corresponding to the photoelectric switch, so that during the relative movement of the mounting seat and the yoke plate, the light shielding sheet can move to the light emitting point of the photoelectric switch, thereby triggering the corresponding photoelectric switch to operate.

2. The VCM structure according to claim 1, characterized in that: The coil assembly includes two coil units spaced apart in a third direction, a liquid cooling plate is provided between the two coil units, the liquid cooling plate is fixed on the mounting base, the liquid cooling plate has a cooling flow path, and the path of the cooling flow path is folded and bent to dissipate heat for the two coil units.

3. The VCM structure according to claim 1, characterized in that: The corresponding yoke plate is also provided with a buffer portion, and the buffer portion is used to abut against the end of the mounting seat.

4. The VCM structure according to claim 1, characterized in that: The magnet assemblies are provided with two, and the two magnet assemblies are respectively arranged on the inner side surfaces of two yoke plates opposite to each other in the third direction.

5. The VCM structure according to claim 1, characterized in that: The coil assembly is used to access a three-phase alternating current.

6. A lens, characterized in that: The VCM structure comprises any one of claims 1 to 5.

7. A photographing device, characterized in that: The lens comprising the lens described in claim 6.

Images