CN115360883A - Large-stroke VCM motor - Google Patents

Abstract

The invention relates to a large-stroke VCM (Voice coil Motor) motor which is used for driving a lens to move along the direction of an optical axis of the lens and defining that a shot object is positioned in front of the optical axis of the lens, wherein the VCM motor comprises a base shell, a zooming component and a plurality of magnets, the shell is connected to a base from the front of the direction of the optical axis to form an accommodating space zooming component, the zooming component is movably arranged in an accommodating space, the magnets are used for generating a magnetic field required for driving the zooming component to move, the shell comprises a cover plate made of a non-magnetic material and a side wall made of a magnetic conductive material, the magnets are used for increasing the magnetic field to increase the thrust in the motor, meanwhile, the side wall and the magnet group are matched to increase the magnetic field and indirectly increase the thrust, the cover plate is not magnetic conductive, so that the thrust in the whole stroke is uniform, the motion linearity of the motor is good, and the focusing effect is good.

Description

Large-stroke VCM motor

Technical Field

The invention relates to the technical field of voice coil motors, in particular to a large-stroke VCM motor.

Background

The VCM motor is mainly composed of a shell, a base, a magnet, an upper spring, a lower spring and a carrier, wherein the shell and the base are immovable parts, the magnet is arranged around the shell and is fixed, the coil is wound on the outer ring of the carrier and is integrated with the carrier, the carrier is arranged between the upper spring and the lower spring and is suspended in an inner cavity magnetic field space formed by the base and the shell, when the coil is electrified, the carrier can move up and down under the action of ampere force to drive the lens to realize the focusing function, the voice coil motor is mainly applied to small-stroke, high-speed and high-acceleration movement and is suitable for narrow and small spaces, and the most common automatic focusing function of a camera of a mobile phone is completely completed by a whole driver.

The voice coil motor is mainly installed on a mobile phone, so the requirement on size is very high, the structure is compact, the function is ensured to be excellent and reliable, the stroke of the motor is increased by the resistance of a spring and cannot move to the maximum stroke, and on the premise of keeping the length, width and size of the motor unchanged, if the focusing stroke of the motor needs to be increased, the height of the motor can be increased, so the driving force for a lens is increased, and the resistance of the spring is overcome. In the prior art, the thrust is generally increased by heightening the magnets, but the motion linearity of the motor cannot be ensured in such a way, so that the motion linearity of the motor is easily beyond the specification requirement, and the focusing effect is influenced.

Disclosure of Invention

The invention aims to provide a VCM motor which has the advantages of precise and compact structure, large stroke, stable motion and good performance.

A large-stroke VCM motor is used for driving a lens to move along the optical axis direction of the lens and defining that a shot object is positioned in front of the optical axis direction of the lens, and comprises a base shell, a zooming component and a plurality of magnets, wherein the shell is connected to a base from the front of the optical axis direction to form an accommodating space zooming component, and the zooming component is movably arranged in an accommodating space; the shell comprises a cover plate made of non-magnetic materials and a side wall made of magnetic materials, the cover plate is located in front of the base in the optical axis direction, the side wall is connected to the periphery of the cover plate and extends towards the base in the optical axis direction, and the magnet is arranged close to the side wall. In the above scheme, be fixed with subassembly and magnet of zooming on the base, magnet makes the interior magnetic field that forms of accommodation space, the subassembly that zooms receives the effect in magnetic field to realize the function of focusing, the lateral wall side is adjacent and parallel with magnet, the top at the subassembly of zooming is fixed to the apron, the lateral wall of a plurality of magnet collocation magnetic material is the configuration of indirect increase thrust, the apron that magnetic material was not made can avoid appearing gathering the magnetic inhomogeneous problem of thrust in leading to whole stroke because of the top, magnet heightens and can increase magnetic field, the thrust of increase motor when guaranteeing compact structure like this.

Further, the top of the side wall is bent inward to form a connection portion, and the periphery of the cover plate is connected to the connection portion. In the above scheme, the lateral wall lock is on the base, and the part of bending at the top is fixed the apron on the subassembly that zooms, and the lateral wall can increase the thrust of motor for magnetic material and magnet collocation to increase the stroke.

Furthermore, four corners of the cover plate are bent downwards, and the bent parts of the cover plate are connected with the zooming component. In the above scheme, four angles of the cover plate are connected with the zooming assembly, the protruding part of the cover plate is connected with the side wall, the cover plate is made of a non-magnetic material, and the focusing effect caused by the uneven thrust in the whole stroke due to the magnetism gathering at the top of the motor is avoided.

Further, the cover is made of SUS304 material, and the side wall is made of SPCC material. In the above-mentioned embodiment, SUS304 is a common stainless steel material, SPCC is a cold-rolled carbon steel sheet or strip, and SUS304 is not permeable to magnetic flux and SPCC is permeable to magnetic flux.

Furthermore, the ends of the magnets, which are located at the rear of the optical axis direction, abut against the base, and the ends of the magnets, which are located at the front of the optical axis direction, abut against the cover plate or abut against the cover plate. In the scheme, under the condition that the external shape of the VCM motor is limited in length and width, the height of the motor needs to be increased by increasing the stroke of the motor, so that the internal thrust can be increased by increasing the magnet, the height of the side wall needs to be correspondingly increased, the whole stroke range is covered by a magnetic field, the stroke of the motor is increased, the height of the magnet is adjusted according to the stroke required by the motor, and the requirement of large stroke can be met under the condition that the VCM motor has small length and width requirements.

Further, the zoom assembly includes a spring assembly and a carrier assembly, the spring assembly suspending the carrier assembly within the housing and the base. In the above scheme, the spring assembly provides elastic restoring force, the carrier assembly moves in the vertical direction under the action of the magnetic field formed by the magnet group, the focusing function is realized, and the zooming assembly is compact in structure and good in performance.

Furthermore, the carrier assembly comprises a carrier, a support and a coil, the support is fixed on the base, the carrier capable of moving along the optical axis direction is arranged in the support, and the coil is sleeved on the periphery of the carrier. In the scheme, the support limits the carrier to move left and right, the carrier is prevented from shaking, the focusing effect is influenced, when the gravity borne by the carrier is balanced with the tension of the upper spring and the lower spring, the carrier is in a suspension state relative to the support, the coil is electrified and then forms magnetic force with a magnetic field generated by the plurality of magnets to push the carrier to move along the optical axis direction, the vertical direction movement of the carrier in the support can be controlled through the size and the direction of current input into the coil, and the stroke requirement of the VCM motor is met. The inner side of the carrier is provided with threads for fixing the lens, the annular groove on the outer ring of the carrier is used for installing a coil, and the coil is electrified to control the lens fixed in the carrier to move in the vertical direction for focusing.

Further, the spring assembly comprises an upper spring and a lower spring, and the upper spring and the lower spring are formed by bending a plurality of string wires. In the scheme, the carrier is connected with the upper spring and the lower spring, the upper spring and the lower spring are both used for bearing the carrier and balancing torque, but the springs also provide resistance to limit the stroke of the carrier and overcome the resistance of the springs, so that the carrier can move farther.

Furthermore, the corner of the base is provided with a boss structure, a positioning groove is formed around the circular through hole in the middle of the base, and the bottom of the base is provided with a PIN foot. In the above scheme, the upper surface of the base is fixed with the lower spring, the positioning groove in the middle of the base is used for positioning the carrier component, the periphery of the base is fixed with the magnet and the side wall adjacent to the magnet, and the pin at the bottom is connected with the external circuit.

The large-stroke VCM motor at least has the following beneficial effects:

first, the stroke is big, and magnet heightens all has the magnetic field to cover in the whole stroke range, and the lateral wall of magnet collocation SPCC material can increase the magnetic field simultaneously for interior thrust increase, the stroke of motor increases, and the height of magnet can be adjusted according to the stroke that the motor needs, can satisfy the demand of big stroke under the very little length and width size requirement of VCM motor.

Second, motion stability, functional, the lateral wall is different with the apron material, and the lateral wall uses SPCCC material parcel around, and the apron uses SUS304 material to cover the top, can prevent like this that the phenomenon of gathering magnetism from appearing in the top of motor for thrust is even in the whole stroke, and the motion linearity of motor is good, and the effect of focusing can be better.

Thirdly, the structure is compact, the occupied space is small, the function of increasing the stroke can be realized by heightening the magnet group, the length and the width of the base, the zooming component and the shell are not changed, and the installation is compact, so that the motor has small length and width.

Drawings

FIG. 1 is an exploded view of a VCM motor of one embodiment;

FIG. 2 is a block diagram of a VCM motor of one embodiment;

FIG. 3 is a schematic view of the zoom assembly of FIG. 1;

FIG. 4 is a schematic view of the carrier assembly of FIG. 3;

fig. 5 is a schematic view of the cover plate of fig. 1.

The reference numbers illustrate: 1. a housing; 2. a magnet; 300. a zoom assembly; 4. a base; 11. a side wall; 12. a cover plate; 310. a spring assembly; 320. a carrier assembly; 311. an upper spring; 312. a lower spring; 321. a carrier; 322. a coil; 323. and (4) a bracket.

Detailed Description

The large-stroke VCM motor according to the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.

As shown in fig. 1 and fig. 2, in a preferred embodiment, a large-stroke VCM motor is used for driving a lens to move along an optical axis direction thereof, and defines that a subject is located in front of the optical axis direction of the lens, the VCM motor includes a housing 1, a zoom assembly 300, a plurality of magnets 2, and a base 4, the housing 1 is connected to the base 4 from the front of the optical axis direction to form an accommodating space, the zoom assembly 300 is movably disposed in the accommodating space; and a plurality of magnets 2 for generating a magnetic field required for driving the zoom assembly 300 to move, the housing 1 includes a cover plate 12 made of a non-magnetic material and a side wall 11 made of a magnetic material, the cover plate 12 is located in front of the optical axis direction of the base 4, the side wall 11 is connected to the periphery of the cover plate 12 and extends towards the base along the optical axis direction, and the magnets 2 are disposed near the side wall 11. Be fixed with on the base 4 and zoom subassembly 300 and magnet 2, magnet 2 makes the accommodation space form the magnetic field in, the function that the subassembly 300 that zooms receives the effect in magnetic field to realize focusing, lateral wall 11 side is adjacent and parallel with magnet 2, apron 12 is fixed at the top of subassembly 300 that zooms, lateral wall 11 of magnet 2 collocation SPCC material is the configuration of indirect increase thrust, apron 12 of SUS304 material is not magnetic, can avoid appearing gathering the inhomogeneous problem of thrust in the whole stroke because of the top gathers magnetism, under the condition that the length and the width of motor appearance all restrict, the stroke of increase motor just must increase the height of motor, it can make thrust increase to obtain the increase magnetic field according to ampere force formula F = BILN, magnet 2 increases and can increase magnetic field, the thrust of increase motor when guaranteeing compact structure like this.

In the above embodiment, as shown in fig. 1 and 2, the top of the side wall 11 is bent inward to form a coupling portion to which the periphery of the cover plate 12 is coupled. The side wall 11 is buckled on the base, the cover plate 12 is fixed on the zooming component 300 by the top bending part, the side wall 11 is made of magnetic conductive materials and matched with the magnet, so that the magnetic field can be increased, the thrust force is indirectly increased, and the thrust force of the motor is increased to overcome the resistance of the spring, so that the maximum stroke of the motor is increased.

As shown in fig. 1 and 5, in the above embodiment, four corners of the cover plate 12 are bent downward, and the bent portions of the cover plate 12 are connected to the zoom assembly 300. In the above scheme, apron 12 four angles are connected with the subassembly 300 top that zooms, and apron 12 bulge is connected with lateral wall 11, and the through-hole shape at top cooperatees with lens, and apron 12 can adopt the mode processing of punching press, chooses for use the material of non-magnetic conduction to avoid VCM motor top to gather magnetism and lead to thrust inhomogeneous in the whole stroke for the motion linearity of motor can not influence the effect of focusing in the specification requirement.

In the above embodiment, as shown in fig. 1, the cover 12 is made of SUS304, and the sidewall 11 is made of SPCC. In the above embodiment, SUS304 is a common stainless steel material, SPCC is a cold-rolled carbon steel sheet or strip, and SUS304 is non-magnetic and SPCC is magnetic. If 11 formula structures as an organic whole of shell are when SPCC material, when increase thrust, the motor top gathers magnetism obvious, can lead to thrust inhomogeneous in the whole stroke for the motion linearity of motor is big, surpasss the specification requirement, influences the effect of focusing.

As shown in fig. 1, in the above embodiment, one end of each of the plurality of magnets located at the rear of the optical axis direction abuts against the base, and one end of each of the plurality of magnets located at the front of the optical axis direction is close to or abuts against the cover plate. In the above scheme, under the condition that the shape length and width of the VCM motor are limited, the height of the motor must be increased by increasing the stroke of the motor, so that the magnetic field can be increased by increasing the magnet, the whole stroke range is covered by the magnetic field, the internal thrust of the motor is increased accordingly, the carrier 321 is pushed to move farther, and the stroke of the motor is increased.

As shown in fig. 3, in the above embodiment, the zoom assembly 300 includes a spring assembly 310 and a carrier assembly 320, the spring assembly 310 suspendedly supports the carrier assembly 320 inside the housing 1 and the base 4. The spring assembly 310 provides elastic restoring force, the carrier assembly 320 drives the lens to move in the vertical direction under the action of the magnetic field formed by the magnet 2, so that the focusing function is realized, and the zoom assembly 300 has a compact structure and good performance.

As shown in fig. 3 and 4, in the above embodiment, the carrier assembly 320 includes a carrier 321, a bracket 323, and a coil 322, the bracket 323 is fixed on the base 4, the carrier 321 capable of moving along the optical axis direction is disposed in the bracket 323, and the coil 322 is sleeved on the periphery of the carrier 321. When the carrier 321 is in a suspension state relative to the support 323 when the gravity borne by the carrier 321 is balanced with the pulling forces of the upper spring 310 and the lower spring 330, the carrier 321 is in a suspension state relative to the support 323, when the magnet 2 generates a magnetic field and forms an electromagnetic induction force with the coil 322, the carrier 321 can move up and down in the support 323, usually, the resistance of the coil 322 is also limited within 20 Ω, when the external shape length and width of the motor are limited, the power needs to be increased when the focusing stroke is increased, the part for increasing the coil 322 is very limited, so that the thrust is increased by increasing the magnet, the vertical movement of the carrier 321 in the support 323 can be controlled by the magnitude and direction of the current input into the coil 322, and the stroke requirement of the VCM motor can be met.

As shown in fig. 3, in the above embodiment, the spring assembly 310 includes an upper spring 311 and a lower spring 312, and the upper spring 311 and the lower spring 312 are formed by bending a plurality of strings. The spring assembly 310 has certain elasticity, the carrier 321 is connected with the upper spring 311 and the lower spring 312, the upper spring 311 and the lower spring 312 are both used for bearing the carrier 321, the moment is balanced, but at the same time, the springs also provide resistance so that the stroke of the carrier 321 is limited, and the spring assembly 310 enables the carrier 321 to freely move in the optical axis direction inside the zoom assembly 300.

As shown in FIG. 1, in the above embodiment, the corner of the base 4 is provided with a boss structure, the circumference of the circular through hole in the middle of the base 4 is provided with a positioning groove, and the bottom of the base 4 is provided with a PIN. The upper surface of the base 4 is fixed with a lower spring 330, the middle positioning groove of the base 4 is used for positioning the carrier component 320, the periphery of the base 4 is fixed with a magnet 2 and an outer cover 1 adjacent to the magnet, and the pin at the bottom is connected with an external circuit.

The invention relates to a large-stroke VCM motor working principle and process, wherein a magnet 2 is fixed on the periphery of a zooming component 300 of a motor, a magnetic field is generated in the magnet 2, a coil 322 on a carrier component 320 is electrified and generates electromagnetic induction force with the magnetic field to push a carrier 321 to move, the carrier 321 can be controlled to move up and down by controlling the size and the direction of the electrified current of the coil 322, when the stroke of the motor is required to be increased, the height of the magnet can be increased, so that the whole stroke range is covered by the magnetic field, the internal thrust of the motor is increased along with the increase of the internal thrust of the motor, so that the carrier 321 is pushed to move farther, a shell 1 of the motor is divided into a side wall 11 and a cover plate 12, the magnet 2 and the SPCC side wall 11 are in magnetic field increasing and the structure configuration of the thrust is indirectly increased, the cover plate 12 is made of SUS304 and is non-magnetic conduction, the problem of non-uniform thrust in the whole stroke caused by top magnetic concentration can be avoided, the movement linearity of the motor is in the specification required range, and the focusing effect of the motor is better.

In the description of the present invention, it is to be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed and operated in specific orientations, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the spirit and scope of the appended claims.

Claims (9)

1. A large-stroke VCM motor for driving a lens to move in an optical axis direction thereof, defining that a subject is located in front of the optical axis direction of the lens, said VCM motor comprising:

a base;

a housing connected to the base from the front in the optical axis direction to form an accommodating space;

the zooming component is movably arranged in the accommodating space; and

the magnets are used for generating a magnetic field required for driving the zooming component to move;

the magnetic induction type LED lamp is characterized in that the shell comprises a cover plate made of a non-magnetic material and a side wall made of a magnetic material, the cover plate is located in front of the base in the optical axis direction, the side wall is connected to the periphery of the cover plate and extends towards the base in the optical axis direction, and the magnet is close to the side wall.

2. A large-stroke VCM motor according to claim 1, wherein the top of said side wall is bent inwardly to form a connection, the periphery of said cover plate being connected to said connection.

3. A large-stroke VCM motor according to claim 1, wherein said cover is bent downward at four corners, said bent portion of said cover being connected to a zoom assembly.

4. A large-stroke VCM motor according to claim 1, wherein said cover is SUS304 and said side walls are SPCC.

5. The large-stroke VCM motor according to claim 1, wherein an end of each of the plurality of magnets located rearward in the optical axis direction abuts against the base, and an end of each of the plurality of magnets located forward in the optical axis direction is close to or abuts against the cover plate.

6. A large-stroke VCM motor according to claim 1, wherein said focus changing assembly comprises a spring assembly and a carrier assembly, said spring assembly suspension supporting said carrier assembly inside said housing and base.

7. The large-stroke VCM motor according to claim 6, wherein the carrier assembly comprises a carrier, a holder, and a coil, the holder is fixed to the base, the carrier movable in the optical axis direction is provided in the holder, and the coil is fitted to an outer periphery of the carrier.

8. The large-stroke VCM motor according to claim 6, wherein said spring assembly comprises an upper spring and a lower spring, each of said upper spring and said lower spring being formed by bending a plurality of strings.

9. A large-stroke VCM motor as claimed in claim 1, wherein said base is provided with bosses at its corners, positioning slots are provided around the circular through hole in the middle of said base, and PIN feet are provided at the bottom of said base.

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