CN222339235U

CN222339235U - Voice Coil Motor and Zoom Lens

Info

Publication number: CN222339235U
Application number: CN202420287603.3U
Authority: CN
Inventors: 龚俊强; 赵媚娇; 李昆; 邱盛平
Original assignee: Zhongshan United Optoelectronic Research Institute Co Ltd
Current assignee: Zhongshan United Optoelectronic Research Institute Co Ltd
Priority date: 2024-02-06
Filing date: 2024-02-06
Publication date: 2025-01-10
Anticipated expiration: 2034-02-06

Abstract

The utility model discloses a voice coil motor and a zoom lens, wherein the voice coil motor comprises a magnetic yoke, a magnet structure and a driving coil, the magnet structure is arranged on the magnetic yoke, the magnet structure comprises two magnetic circuit assemblies which are arranged at intervals up and down, each magnetic circuit assembly comprises two magnets which are arranged at intervals up and down, the magnetic poles of one side, which are close to each other, of the two magnets are arranged differently, the two magnets form a magnetic gap, the driving coil comprises two wire groups which are arranged oppositely up and down, one wire group is arranged in the magnetic gap formed by the two magnets of one magnetic circuit assembly, the other wire group is arranged in the magnetic gap formed by the two magnets of the other magnetic circuit assembly, the two magnets can generate strong enough magnetic fields, and can also be arranged in the strong magnetic fields when the moving stroke of the driving coil is longer, and the two side parts of the driving coil are synchronously driven, so that the driving force is strong, and the problems that the existing VCM motor is limited by volume and the design stroke of the VCM motor is relatively small are solved.

Description

Voice coil motor and zoom lens

Technical Field

The utility model relates to the technical field of zoom lenses, in particular to a voice coil motor and a zoom lens.

Background

Voice Coil Motors (VCMs) are a new type of linear motor designed based on the ampere force principle, which is known as a speaker. The magnetic field generator mainly comprises a permanent magnet, a coil and a magnetic yoke. The principle is that energizing the coil generates force in the magnetic field, the magnitude of the force is proportional to the current applied to the coil, and according to the lorentz force principle, the thrust force is generated to drive the coil to move axially in the air gap, and the coil moves linearly back and forth along with the change of the current direction and the value in the coil. The voice coil motor has the advantages of high response, high acceleration, simple structure, good force characteristic and the like in theory, and has the advantages of simple structure, small volume, low noise, high specific thrust, large acceleration (more than 20 times of gravity acceleration), high response speed (millisecond level), high precision (up to 1-5 mu m), convenient maintenance and high reliability.

In the novel long-stroke VCM motor structure in the prior art, the moving stroke of the rotor is relatively long, the motor force is relatively large, but when the stroke is too long, the phenomenon of smaller magnetic force occurs in the middle of the magnet, the motor force is greatly influenced, the longer the structural length is, the smaller the magnetic field is, the smaller the driving force is, and the volume is required to be continuously increased if the driving force is required to be increased, namely, the stroke on the structure is limited, meanwhile, the driving force is also limited, and the volume is also limited to a certain extent.

Disclosure of utility model

The utility model mainly aims to provide a voice coil motor and a zoom lens, and aims to solve the problems that the existing VCM motor is limited by volume and the design stroke of the VCM motor is relatively small.

In order to achieve the above object, the present utility model provides a voice coil motor, including:

A mounting base;

The magnet structure is arranged on the mounting seat and comprises two magnetic circuit assemblies which are arranged at intervals in the up-down direction, each magnetic circuit assembly comprises two magnets which are arranged at intervals in the up-down direction, the magnetic poles of one side, close to each other, of the two magnets are arranged differently, the two magnets are formed with magnetic gaps which extend in the front-back direction, and

The driving coil comprises two wire sets which are oppositely arranged up and down, wherein one wire set is positioned in a magnetic gap formed by two magnets of one magnetic circuit assembly, the other wire set is positioned in a magnetic gap formed by two magnets of the other magnetic circuit assembly, and when the driving coil is electrified, the two magnetic circuit assemblies are used for generating electromagnetic force with the driving coil so as to drive the driving coil to move along the front and back directions.

Optionally, each magnet includes a plurality of magnets sequentially arranged at intervals in a front-rear direction.

Optionally, the mounting seat is configured as a magnetic yoke, the magnetic yoke forms a mounting groove with an opening, the opening is formed on one side of the magnetic yoke, which is located at the left and right directions, the opening extends in the front and back directions, and the magnet structure and the driving coil are both mounted in the mounting cavity.

Optionally, the magnetic yoke comprises two first magnetic yokes extending along the front-back direction and arranged at intervals in the up-down direction;

one side of each first magnetic yoke facing the other first magnetic yoke is fixed with one magnet.

Optionally, two sides of the first magnetic yokes, which are close to each other, are concavely provided with limiting grooves, and one magnet is installed in a corresponding limiting groove.

Optionally, the magnetic yoke further comprises two second magnetic yokes, the two second magnetic yokes are arranged at intervals in the front-back direction, and the two second magnetic yokes are respectively arranged at two ends of the two first magnetic yokes in the front-back direction.

Optionally, the magnetic yoke further comprises a third magnetic yoke disposed at one side end of the two first magnetic yokes located in the left-right direction, and the two first magnetic yokes, the two second magnetic yokes and the third magnetic yoke enclose together to form the mounting cavity.

Optionally, a fourth magnetic yoke extending in the front-back direction is further arranged on the magnetic yoke, and the fourth magnetic yoke is arranged in the mounting groove and is positioned between the two magnetic circuit components;

the magnet is respectively arranged at the two side parts of the fourth magnetic yoke in the up-down direction.

A zoom lens, the zoom lens comprising:

a lens assembly including an adjustable lens set movably disposed in a front-rear direction, and

The driving coil of the voice coil motor is fixedly connected with the adjusting mirror group;

Wherein, voice coil motor includes:

A mounting base;

Optionally, the driving coils are provided in plurality, the adjusting lens groups are provided in plurality, and each adjusting lens group is fixedly connected with a corresponding driving coil.

In the technical scheme provided by the utility model, the driving coil is in an annular arrangement and is provided with two wire groups which are oppositely arranged up and down, the magnet structure comprises two magnetic circuit assemblies, each magnetic circuit assembly comprises magnets with two magnetic poles which are arranged differently, a magnetic gap is formed between the two magnets, one wire group is positioned in the magnetic gap formed by the two magnets of one magnetic circuit assembly, the other wire group is positioned in the magnetic gap formed by the two magnets of the other magnetic circuit assembly, when the driving coil is electrified, the two wire groups are respectively positioned in magnetic fields generated by the two magnets, according to ampere rules, the two wire groups are acted by ampere force, so that the upper side part and the lower side part of the driving coil can be acted by ampere force to move.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of a voice coil motor according to an embodiment of the present utility model;

FIG. 2 is an exploded view of the voice coil motor of FIG. 1;

Fig. 3 is a schematic perspective view of an adjusting lens group of the zoom lens according to the present utility model;

Fig. 4 is a schematic perspective view of an adjusting lens group and a voice coil motor in the zoom lens according to the present utility model.

Reference numerals illustrate:

Reference numerals	Name of the name	Reference numerals	Name of the name
				100	Voice coil motor	2	Magnet structure
1	Mounting base	20	Magnetic circuit assembly
				11	A first magnetic yoke	21	Magnet body
11a	Limiting groove	211	Magnet
				12	A second magnetic yoke	3	Driving coil
13	Third magnetic yoke	31	Wire set
				14	Fourth magnetic yoke	40	Adjusting lens group

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear are referred to in the embodiments of the present utility model), the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The single-magnet single-side magnet or double-magnet single-side magnet drive has the following defects in the prior VCM motor design with the structure:

1, the single-yoke magnet or double-yoke single-side magnet driving coil VCM motor has low magnetic field intensity and relatively low driving force.

2, A single magnet yoke or a single magnet yoke and a double magnet yoke drive a coil VCM motor, and the design stroke of the VCM motor is relatively small because of the influence of factors such as driving force, volume and the like.

3, Single magnet yoke or double magnet yoke single side magnet driving coil VCM motor, in order to achieve larger driving force, thicker, wider big magnet and big magnet yoke are needed, resulting in relatively high cost.

In order to solve the above-mentioned problems, the present utility model provides a voice coil motor, fig. 1 is a schematic perspective view of an embodiment of the voice coil motor of the present utility model, fig. 2 is an exploded schematic view of the voice coil motor of fig. 1;

fig. 3 is a schematic perspective view of an adjusting lens group of a zoom lens according to the present utility model, and fig. 4 is a schematic perspective view of an adjusting lens group and a voice coil motor in the zoom lens according to the present utility model.

Referring to fig. 1-2, the voice coil motor 100 includes a mounting base 1, a magnet structure 2 and a driving coil 3, wherein the magnet structure 2 is disposed on the mounting base 1, the magnet structure 2 includes two magnetic circuit assemblies 20 disposed at intervals in an up-down direction, each magnetic circuit assembly 20 includes two magnets 21 disposed at intervals in the up-down direction, magnetic poles of sides of the two magnets 21 close to each other are disposed differently, the two magnets 21 are formed with magnetic gaps extending in a front-back direction, the driving coil 3 includes two wire sets 31 disposed opposite to each other in the up-down direction, one wire set 31 is disposed in the magnetic gap formed by the two magnets 21 of one magnetic circuit assembly 20, and the other wire set 31 is disposed in the magnetic gap formed by the two magnets 21 of the other magnetic circuit assembly 20, and when the driving coil 3 is energized, the two magnetic circuit assemblies 20 are used for generating electromagnetic force with the driving coil 3 to drive the driving coil 3 to move in the front-back direction.

It should be noted that, when the two wire sets 31 of the driving coil 3 are oppositely disposed, the current directions of the two wire sets 31 are reversely disposed, so that the directions of the ampere forces generated by the two wire sets 31 are consistent, the directions of the magnetic poles of the two magnets 21 of each magnetic circuit assembly 20 can be adjusted, for example, when a magnetic field passing through the palm of the hand downwards is formed between the two magnets 21 of one magnetic circuit assembly 20, a magnetic field passing through the palm of the hand upwards is formed between the two magnets 21 of the other magnetic circuit assembly 20, and thus, when the currents of the two wire sets 31 are reversely disposed, the finally generated ampere forces can be both forward or backward finally, so that a double driving force can be generated.

It should be noted that, the two wire sets 31 of the driving coil 3 may be two side portions located at the upper and lower directions of the driving coil 3, or two side portions located at the left and right directions, and of course, the two magnetic circuit assemblies 20 are correspondingly arranged at intervals in the left and right directions, and each magnetic circuit assembly 20 includes two magnets 21 arranged at intervals in the left and right directions. Of course, the two lead wire sets 31, specifically, where two segments are on the driving coil 3, are not limited to the above examples, and other modifications are possible by those skilled in the art in light of the technical spirit of the embodiments of the present disclosure, but all the functions and effects of the two lead wire sets are the same as or similar to those of the embodiments of the present disclosure, and are included in the protection scope of the embodiments of the present disclosure.

The material of the mounting base 1 may be a non-magnetic material, or may be a magnetic yoke, which is not limited in this embodiment.

In the technical scheme provided by the utility model, the driving coil 3 is in an annular arrangement and is provided with two lead groups 31 which are oppositely arranged up and down, the magnet structure 2 comprises two magnetic circuit assemblies 20, each magnetic circuit assembly 20 comprises magnets 21 with two magnetic poles which are arranged differently, a magnetic gap is formed between the two magnets 21, one lead group 31 is positioned in the magnetic gap formed by the two magnets 21 of one magnetic circuit assembly 20, the other lead group 31 is positioned in the magnetic gap formed by the two magnets 21 of the other magnetic circuit assembly 20, when the driving coil 3 is electrified, the two lead groups 31 are respectively positioned in magnetic fields generated by the two magnets 21, and according to ampere rules, the two lead groups 31 are acted by ampere force, so that the upper side and the lower side of the driving coil 3 can be acted by the ampere force to move.

Specifically, in the present embodiment, each of the magnets 21 includes a plurality of magnets 211 that are sequentially arranged at intervals in the front-rear direction. Thus, the magnets 211 may be used as a minimum unit for providing a magnetic field, the number of the magnets 211 may be reasonably set according to the required driving stroke length of the voice coil motor 100, and a plurality of the magnets 211 may be provided, so that each of the magnets 211 may be more stable. And the magnet volume demand is little for the volume requirement of mount pad 1 is little, and the demand cost is low.

In this embodiment, the mounting base 1 is configured as a magnetic yoke, the magnetic yoke forms a mounting groove with an opening, the opening is disposed on one side of the magnetic yoke, which is located in the left-right direction, the opening is disposed in a manner of extending in the front-rear direction, and the magnet structure 2 and the driving coil 3 are both mounted in the mounting cavity. The magnetic yoke is made of a magnetic conductive material, which is a material capable of effectively concentrating and guiding magnetic force lines, and is generally made of iron, steel, ferrite, and the like, and the magnetic yoke surrounds the outer circumferences of the plurality of magnets 21, so that the magnetic field loss can be limited, the utilization rate of the magnetic field can be improved, and the coil can be protected from external interference.

Specifically, in the present embodiment, the yoke includes two first yokes 1 extending in the front-rear direction and arranged at intervals in the up-down direction, and one side of each first yoke 1 facing the other first yoke 1 is fixed to one of the magnets 21. The first yoke 1 guides magnetic lines of force from the extreme of one of the magnets 21 to the extreme of the other of the magnets 21, forming a closed magnetic circuit to provide a path of low reluctance, enabling the magnetic lines of force to flow more efficiently, thereby increasing the strength and stability of the magnetic field. In this way, each of the magnets 21 is fixedly attached to one side of the corresponding one of the first yokes 1, so as to limit the dissipation of the magnetic field in the up-down direction, thereby improving the utilization rate of the magnetic field in the up-down direction.

Specifically, in this embodiment, the side surfaces of the two first yokes 1, which are close to each other, are each concavely provided with a limiting groove 11a, and one of the magnets 21 is mounted in a corresponding one of the limiting grooves 11 a. Thus, the magnet 21 is mounted by arranging the mounting groove, so that the magnet 21 is limited in the mounting groove, and the structure is more stable.

Further, in the present embodiment, the yoke further includes two second yokes 2 disposed at intervals in the front-rear direction, and the two second yokes 2 are disposed at two ends of the two first yokes 1 in the front-rear direction. In this way, the two second yokes 2 are extended to the end or tip of the voice coil motor 100 to further enhance the focusing effect of the magnetic field and provide additional mechanical protection, and limit the driving coil 3 to some extent.

Further, in the present embodiment, the yoke further includes a third yoke 3 provided at one side end of the two first yokes 1 in the left-right direction, and the two first yokes 1, the two second yokes 2, and the third yoke 3 jointly enclose the mounting cavity. By providing the third yoke 3, the magnetic field in the side region generated by the magnet structure 2 can also be guided and restrained to further enhance the focusing effect of the magnetic field. And the voice coil motor 100 may be fixedly coupled to the inside of the barrel of the lens through the third yoke 3.

Specifically, in this embodiment, a fourth yoke 4 extending in the front-rear direction is further disposed on the yoke, the fourth yoke 4 is disposed in the mounting groove and located between the two magnetic circuit assemblies 20, and the magnets 21 are respectively mounted on two side portions of the fourth yoke 4 in the up-down direction. Two of the magnets 21 are in close contact with the driving coil 3. Therefore, the focusing effect of the magnetic field can be enhanced, the magnetic field can be transferred to the driving coil 3, and the magnetic field utilization rate is improved.

Referring to fig. 3 to 4, the present utility model further provides a zoom lens, which is disposed in a photographing, a shooting, and various intelligent terminals (such as a mobile phone, an automobile, a robot, etc.), wherein the zoom lens includes a lens assembly and a voice coil motor 100, the lens assembly includes an adjusting lens group 40 movably disposed along a front-back direction, and a driving coil 3 of the voice coil motor 100 is fixedly connected with the adjusting lens group 40. Because the zoom lens includes the voice coil motor 100, the specific structure of the voice coil motor 100 refers to the above embodiments, and because the voice coil motor 100 of the zoom lens adopts all the technical solutions of all the embodiments, at least has all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein.

In the technical scheme provided by the utility model, when the lens is set as a zoom lens, a lens group is required to realize zooming or focusing, and the adjusting lens group 40 is fixedly connected with the voice coil motor 100, so that the focusing and zooming operations of the lens can be more rapidly performed due to longer moving stroke of the driving coil 3. A larger lens movement range is provided, thereby achieving a larger zoom range. This means that focusing and zooming can be performed in a wider focal length range, meeting different shooting requirements. Because the driving stroke of the voice coil motor 100 is longer, the voice coil motor 100 can realize more accurate lens focusing and zooming control of the adjusting lens group 40, and fine adjustment can be realized, so that the adjustment of the focus and zooming multiple is more accurate and fine. And it can also realize a quieter operation due to a longer stroke of the voice coil motor 100, reducing noise generated when the lens is focused and varied.

Further, the focusing function is typically accomplished by movement of one or more lens assemblies. Movement of these lens assemblies can change the focus of the image so that the zoom lens can focus sharply on subjects at different distances. The focusing function is usually implemented by a manual focusing ring, an automatic focusing system or a hybrid focusing system, in this embodiment, a plurality of driving coils 3 are provided, a plurality of adjusting lens sets 40 are provided, and each adjusting lens set 40 is fixedly connected with a corresponding driving coil 3. Therefore, the lens group which needs to be automatically adjusted can be connected with the corresponding driving coil 3, so that automatic focusing or zooming can be realized.

It is to be understood that the zoom lens further includes a control device and a position measuring device, where the control device is electrically connected to the position measuring device and the voice coil motor 100, and is configured to control the voice coil motor 100 to operate according to the position measuring device, so as to adjust the position of each of the adjusting lens groups 40.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. A voice coil motor, comprising:

Mounting seat;

A magnet structure is provided on the mounting seat, the magnet structure includes two magnetic circuit components spaced apart from each other upward, each magnetic circuit component includes two magnets spaced apart from each other upward, the magnetic poles of the two magnets on a side close to each other are arranged differently, and the two magnets form a magnetic gap extending in a front-to-back direction; and,

The driving coil includes two wire groups which are arranged opposite to each other in an upward and downward direction, wherein one of the wire groups is located in a magnetic gap formed by two magnets of one magnetic circuit component, and the other wire group is located in a magnetic gap formed by two magnets of another magnetic circuit component. When the driving coil is energized, the two magnetic circuit components are used to generate electromagnetic force with the driving coil to drive the driving coil to move in a forward and backward direction.

2 . The voice coil motor according to claim 1 , wherein each of the magnets comprises a plurality of magnets arranged in sequence and spaced apart from each other in a front-to-rear direction.

3. The voice coil motor as described in claim 1 is characterized in that the mounting seat is configured as a yoke, the yoke forms a mounting groove with an opening, the opening is arranged on the left and right side of the yoke upward, the opening is extended in the front and back directions, and the magnet structure and the drive coil are both installed in the mounting groove.

4. The voice coil motor according to claim 3, wherein the yoke comprises two first yokes extending in the front-rear direction and spaced apart in the upper and lower directions;

A side of each of the first magnetic yokes facing another of the first magnetic yokes is fixed to one of the magnets.

5. The voice coil motor as claimed in claim 4, characterized in that the two sides of the first yokes close to each other are both concavely provided with limiting grooves, and one of the magnets is installed in a corresponding one of the limiting grooves.

6. The voice coil motor as claimed in claim 4, characterized in that the yoke further comprises two second yokes spaced apart in a front-to-back upward direction, and the two second yokes are respectively arranged at two ends of the two first yokes in a front-to-back upward direction.

7. The voice coil motor as claimed in claim 6, characterized in that the yoke also includes a third yoke arranged at one side end of the two first yokes facing left and right and upward, and the two first yokes, the two second yokes and the third yoke together enclose the installation groove.

8. The voice coil motor according to claim 3, wherein the magnetic yoke is further provided with a fourth magnetic yoke extending in a front-to-rear direction, the fourth magnetic yoke being arranged in the mounting groove and located between the two magnetic circuit components;

The fourth magnetic yoke is provided with a magnet on two upper and lower sides respectively.

9. A zoom lens, comprising:

A lens assembly, comprising an adjustable lens group that can be movably arranged in a front-rear direction; and

The voice coil motor according to any one of claims 1 to 8, wherein the driving coil of the voice coil motor is fixedly connected to the adjustment mirror assembly.

10. The zoom lens according to claim 9, wherein a plurality of the driving coils are provided, a plurality of the adjusting lens groups are provided, and each of the adjusting lens groups is fixedly connected to a corresponding one of the driving coils.