CN210927759U

CN210927759U - Voice coil motor, camera module and electronic equipment

Info

Publication number: CN210927759U
Application number: CN202020022652.6U
Authority: CN
Inventors: 贾玉虎
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-01-06
Filing date: 2020-01-06
Publication date: 2020-07-03
Anticipated expiration: 2030-01-06

Abstract

The application mainly relates to voice coil motor, camera module and electronic equipment, wherein, voice coil motor includes base, lower shell fragment, carrier, yoke and last shell fragment, and logical unthreaded hole has been seted up to the base, and lower shell fragment and pedestal connection to with carrier elastic contact on voice coil motor's axis direction, the mounting hole has been seted up to the carrier, go up the shell fragment and be connected with the yoke, and with carrier elastic contact on the axis direction. The base is provided with a first dustproof ring on one side close to the carrier, the area wrapped by the projection of the first dustproof ring on the projection plane is at least partially overlapped with the projection of the light through hole on the projection plane, the carrier is provided with a second dustproof ring on one side close to the base, the area wrapped by the projection of the second dustproof ring on the projection plane is at least partially overlapped with the projection of the mounting hole on the projection plane, and the second dustproof ring and the first dustproof ring form a dustproof structure of the voice coil motor so as to reduce the probability that stains generated in the focusing process of the voice coil motor are adhered to the lens through a gap between the carrier and the base.

Description

Voice coil motor, camera module and electronic equipment

Technical Field

The application relates to the technical field of electronic equipment, in particular to a voice coil motor, a camera module and electronic equipment.

Background

With the increasing popularity of electronic devices, electronic devices have become indispensable social and entertainment tools in people's daily life, and users have higher and higher requirements for electronic devices. For example: the user's requirement to the cell-phone function of shooing is increasingly stricter, has presented bigger challenge to camera module and relevant structure.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a voice coil motor, wherein the voice coil motor comprises a base, a lower elastic sheet, a carrier, a magnetic yoke and an upper elastic sheet, the base is provided with a light through hole, the lower elastic sheet is connected with the base and elastically contacts with the carrier in the axial direction of the voice coil motor, the carrier is provided with a mounting hole, the magnetic yoke covers the base, and the upper elastic sheet is connected with the magnetic yoke and elastically contacts with the carrier in the axial direction; wherein, one side that the base is close to the carrier is provided with first dust ring, the regional and the projection of logical unthreaded hole on the projection plane of perpendicular to axis direction that first dust ring is wrapped at least partly coincide, one side that the carrier is close to the base is provided with the second dust ring, the regional and the projection of mounting hole on the projection plane at least partly coincide of the region that the projection of second dust ring on the projection plane was wrapped, the dustproof construction of second dust ring and first dust ring one-tenth sound circle motor.

The embodiment of the application further provides a camera module, wherein, the camera module comprises a lens, an image sensor and the voice coil motor, the lens is arranged in the mounting hole, the image sensor is arranged on one side of the base far away from the carrier, and the lens and the image sensor are arranged oppositely in the optical axis direction of the camera module.

The embodiment of the application provides an electronic equipment again, wherein, this electronic equipment includes display module assembly, back shroud, center and above-mentioned embodiment the camera module, display module assembly, back shroud are located the relative both sides of center respectively to be connected with the center, the camera module sets up between display module assembly and back shroud.

The beneficial effect of this application is: the voice coil motor provided by the application is provided with the dustproof structure between the carrier and the base, so that the probability that stains generated in the focusing process of the voice coil motor are adhered to the lens through the gap between the carrier and the base is reduced, and the reliability of the voice coil motor is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of an electronic device provided in the present application;

FIG. 2 is an exploded view of the electronic device of FIG. 1;

FIG. 3 is an exploded view of the camera module shown in FIG. 2;

FIG. 4 is an exploded view of the voice coil motor of FIG. 3;

FIG. 5 is a schematic sectional view of the voice coil motor of FIG. 4 taken along the direction V-V;

FIG. 6 is a schematic view of an area encompassed by a projection of a first dust collar on a projection plane;

FIG. 7 is a schematic view of a projection of a clear aperture onto a projection plane;

FIG. 8 is a schematic structural view of another embodiment of the dust-proof structure of FIG. 5;

FIG. 9 is a schematic view of the base of FIG. 4;

FIG. 10 is a schematic structural view of the lower spring plate in FIG. 4;

FIG. 11 is a schematic view of the carrier of FIG. 4 on a side thereof adjacent to the base;

FIG. 12 is a schematic view of the carrier of FIG. 4 on a side thereof remote from the base;

FIG. 13 is a schematic structural view of the upper spring plate in FIG. 4;

fig. 14 is a schematic view of the structure of the yoke in fig. 4.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive work are within the scope of the present application.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The inventors of the present application have found, through long-term research: at present, a camera module mainly adopts a common open-loop motor, a closed-loop motor and a middle motor. The market demand of the center motor is larger than that of other motors, and the reasons are as follows: compared with a closed-loop motor, the cost of the middle motor is lower; compared with a common open-loop motor, the middle-mounted motor can move up and down, the elastic sheet has no pre-pressure, and under the condition of the same size specification, the middle-mounted motor can provide a larger stroke, the focusing speed is higher, and the power consumption is lower. Although the demand of the current market to the centrally-mounted motor is large, the centrally-mounted motor used at present is not provided with a dustproof structure, so that the dustproof effect of the centrally-mounted motor is poor, and the bad problem that the camera module generates stains to pollute the lens in the production, manufacturing, user use and other processes is difficult to avoid. To this end, the present application proposes the following examples.

Referring to fig. 1 and fig. 2 together, fig. 1 is a schematic structural diagram of an embodiment of an electronic device provided in the present application, and fig. 2 is a schematic exploded structural diagram of the electronic device in fig. 1.

In the embodiment of the present application, the electronic device 10 may be a portable device such as a mobile phone, a tablet computer, a notebook computer, and a wearable device. Among other things, the electronic device 10 may include a display module 11, a rear cover 12, a middle frame 13, and a camera module 14, as shown in fig. 2. The display module 11 and the rear cover plate 12 are respectively located on two opposite sides of the middle frame 13 and connected with the middle frame 13, so that the display module 11 and the rear cover plate 12 form a basic structure for clamping the middle frame 13 together after the three are assembled, as shown in fig. 1. For example, the display module 11 and the rear cover plate 12 are respectively covered on two opposite surfaces of the middle frame 13 by one or a combination of assembling manners such as clamping, gluing, welding and the like. In the embodiment of the present application, the side edge of the display module 11 may be bent toward the middle frame 13, so that the picture displayed by the display module 11 may extend from the front of the display module 11 to the side thereof in a form similar to a "waterfall", thereby enabling the electronic device 10 to provide a larger display view for the user. Accordingly, the side edges of the rear cover 12 may also be curved toward the center frame 13 to increase the aesthetic appearance and grip feel of the rear cover 12. Further, camera module 14 sets up between display module 11 and back shroud 12 to can receive the light that comes from external environment, so that camera module 14 can realize functions such as shooing, payment, unblock. Of course, the electronic device 10 may also be provided with a battery, a motherboard, and other components. The display module 11, the camera module 14 and other components may be connected to the battery and the motherboard respectively, so that they can be supplied with electric energy from the battery, and can execute corresponding instructions under the control of the motherboard.

It should be noted that, taking a mobile phone as an example, the camera module 14 may be a front-mounted type or a rear-mounted type.

Generally, the display module 11 may be a screen such as an lcd (liquid Crystal display), an OLED (Organic Light-Emitting Diode), a Mini-LED, or a Micro-LED. The display module 11 may include a transparent cover 111 and a display panel 112, as shown in fig. 2. The transparent cover 111 is mainly used for protecting the display panel 112, and may be an outer surface of the electronic device 10, so as to facilitate a user to perform a touch operation such as clicking, sliding, pressing, and the like. The transparent cover 111 may be made of a rigid material such as glass, or may be made of a flexible material such as Polyimide (PI) or Colorless Polyimide (CPI). The display panel 112 is mainly used for displaying a screen, and can be used as an interactive interface to instruct a user to perform the touch operation on the transparent cover 111. The display panel 112 may be attached to the transparent cover 111 by using a sealant such as OCA (optical Clear Adhesive) or PSA (pressure sensitive Adhesive). In some other embodiments, the outer surface of the electronic device 10 (i.e., the outer surface of the transparent cover plate 111) may be further provided with any one of other functional film layers, such as a tempered film, a frosted film, a decoration film, a peep-proof film, a water condensation film, and the like, so that the electronic device 10 can provide different use effects for users.

The rear cover 12 may be a battery cover of the electronic device 10, and may be made of glass, metal, hard plastic, or other electrochromic materials. The rear cover 12 has a certain structural strength, and is mainly used to protect the electronic device 10 together with the transparent cover 111. Accordingly, the material of the middle frame 13 may be glass, metal, hard plastic, or the like. The middle frame 13 also has a certain structural strength, and is mainly used for supporting and fixing the camera module 14 of the embodiment of the present application and other structural members such as a battery, a main board, and a camera module. Further, since the rear cover plate 12 and the middle frame 13 are generally directly exposed to the external environment, the rear cover plate 12 and the middle frame 13 may preferably have certain properties of wear resistance, corrosion resistance, scratch resistance, etc., or the outer surfaces of the rear cover plate 12 and the middle frame 13 (i.e., the outer surfaces of the electronic device 10) may be coated with a layer of functional material for wear resistance, corrosion resistance, scratch resistance, etc.

Further, the rear cover plate 12 and the middle frame 13 may be two separate structural members, as shown in fig. 2, and the two may be assembled by one or a combination of clamping, gluing, welding, and the like. The middle frame 13 may specifically include a frame 131 and a middle plate 132, and the middle plate 132 is connected to the frame 131. In some embodiments, the material of the frame 131 may be metal, the material of the middle plate 132 may be rigid plastic, and both the two may be manufactured into the middle frame 13 by injection molding, that is, the middle frame 13 may be an integrally molded structural member, so that the structure of the middle frame 13 can be simplified, and the manufacturing cost of the middle frame 13 can be reduced. At this time, the frame 131 may be exposed to the external environment and has an appearance surface capable of playing a role of decoration; the middle plate 132 is mainly located inside the electronic device 10, and can function to support and fix a structural member such as the camera module 14. In other embodiments, the frame 131 and the middle plate 132 may be two separate structural members. The rear cover plate 12 and the frame 131 may be manufactured into an integrally formed structural member through a molding process such as heat absorption, stamping, injection molding, and the middle plate 132 may be assembled with the integrally formed structural member through one or a combination of assembling manners such as clamping, bonding, welding, and the like. For example: when the transparent cover plate 111 is made of glass, and the rear cover plate 12 and the frame 131 are also made of glass, the rear cover plate 12 and the frame 131 may be manufactured into an integrally formed structural member through a thermal absorption forming process, and the transparent cover plate 111 made of glass may be welded to the integrally formed structural member by means of glass solder, so as to realize the body integration of the electronic device 10.

Referring to fig. 3, fig. 3 is an exploded view of the camera module shown in fig. 2.

The camera module 14 may include a lens 141, an image sensor 142, a voice coil motor 143, and an infrared filter 144. The lens 141 may be made of glass or plastic. The lens 141 is mainly used to change the propagation path of light and focus the light. The lens 141 may include multiple sets of lenses that mutually correct and filter light; when light passes through the lens 141, the multiple lens layers filter stray light (e.g., infrared light), so as to increase the imaging effect of the camera module 14. The image sensor 142 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) image sensor. For image sensors such as CMOS, RGGB and RYYB can be used as the basis. The image sensor 142 may be disposed opposite to the lens 141 in an optical axis direction (as indicated by a dashed line 145 in fig. 3) of the camera module 14, and is mainly used for receiving light from the lens 141 and converting an optical signal into an electrical signal, so as to meet an imaging requirement of the camera module 14. The voice coil motor 143 is mainly used for adjusting the distance between the lens 141 and the image sensor 142, so that the imaging effect of the image sensor 142 can meet the use requirement of the user. Further, an infrared filter 144 may be disposed between the lens 141 and the image sensor 142, and the infrared filter 144 is mainly used for filtering infrared light to increase the imaging effect of the camera module 14.

Based on the imaging principle of the camera module 14, there is a relatively high requirement for the cleanliness of the lens 141 thereof. If there is any stain on the lens 141, the image sensor 142 will also present the stain when imaging; the image of the stain is obviously not needed, so the stain can affect the imaging effect of the camera module 14. Furthermore, for the camera module 14, stains generated in the production process can be avoided by means of improving the production environment level, adding a spot-repairing glue process, adding a finished product appearance inspection and the like, so as to increase the yield of the finished product; and stains generated in the using process of the user are mainly avoided by optimizing the structure of the camera module 14, so that the reliability of the camera module 14 is improved. In addition, since the voice coil motor 143 drives the lens 141 to move away from or close to the image sensor 142 according to the imaging requirement (also referred to as focusing), a stain may be generated during the focusing process, and the stain may adhere to the lens 141 through a structural gap of the voice coil motor 143. Therefore, the embodiment of the present invention mainly optimizes the structure of the voice coil motor 143 to reduce the probability of the stains adhering to the lens 141 as much as possible, thereby increasing the reliability of the camera module 14.

The specific structure of the voice coil motor 143 and its cooperation with other structural members in the camera module 14 will be described in detail below:

referring to fig. 4 and 5 together, fig. 4 is an exploded view of the voice coil motor of fig. 3, and fig. 5 is a cross-sectional view of the voice coil motor of fig. 4 along a V-V direction. Fig. 4 and 5 only illustrate the mounting hole 14331 for installing the lens 141, and do not directly illustrate the lens 141.

The voice coil motor 143 may include a base 1431, a lower spring 1432, a carrier 1433, a coil 1434, a yoke 1435, an upper spring 1436, and a magnet 1437. The magnetic yoke 1435 is covered on the base 1431, for example, the magnetic yoke and the base are assembled by one or a combination of assembling modes such as clamping, welding, gluing and the like, and an accommodating space is formed (neither marked in fig. 4 nor fig. 5); the other components of the voice coil motor 143 are mainly integrated into the accommodating space.

The lower spring plate 1432 is connected to the base 1431 and contacts the carrier 1433 in the axial direction of the voice coil motor 143 (as shown by the chain line 100 in fig. 4); the upper spring plate 1436 is connected to the yoke 1435, and is in contact with the carrier 1433 in the axis direction 100. The arrangement is such that the upper spring plate 1436 and the lower spring plate 1432 can elastically support the carrier 1433 in the axial direction 100, so as to facilitate the voice coil motor 143 to achieve fast focusing. Accordingly, carrier 1433 is primarily used to position lens 141.

Based on fleming's left-hand rule, the coil 1434 is wound around the carrier 1433, and the magnet 1437 is disposed between the yoke 1435 and the base 1431 and on a side of the coil 1434 away from the carrier 1433, so that the coil 1434 and the magnet 1437 cooperate to generate a magnetic force pushing the carrier 1433, thereby enabling the carrier 1433 to move in the axis direction 100.

Since the image sensor 142 can be disposed opposite the lens 141 in the optical axis direction 145 of the camera module 14 (specifically, the image sensor 142 is disposed on the side of the base 1431 away from the carrier 1433, and can be disposed opposite the lens 141 in the axis direction 100), while the carrier 1433 is provided with the lens 141. Therefore, when the carrier 1433 moves along the axial direction 100, the lens 141 can be driven to approach or depart from the image sensor 142, that is, the voice coil motor 143 can achieve the focusing requirement of the camera module 14. Further, in the embodiment of the present invention, in order to prevent stains generated during the focusing process of the voice coil motor 143 from adhering to the lens 141, a dust-proof structure is disposed between the carrier 1433 and the base 1431, and the specific structure will be described in detail later.

As shown in fig. 4, the base 1431 has a light-passing hole 14311, the carrier 1433 has a mounting hole 14331, and the yoke 1435 has a light-entering hole 14351. The light inlet 14351 is mainly used for allowing light to reach the lens 141, the mounting hole 14331 is mainly used for installing the lens 141, and the light through hole 14311 is mainly used for allowing the light focused by the lens 141 to reach the light sensor 142. Further, the light-passing hole 14311, the mounting hole 14331, and the light-entering hole 14351 may be circular, and central axes of the three may coincide with the axial direction 100, so as to facilitate light to pass through the voice coil motor 143, thereby increasing reliability of the voice coil motor 143. Wherein the inner wall of mounting hole 14331 is provided with a threaded structure to facilitate locking lens 141 to carrier 1433.

In this embodiment, a first dust ring 14312 is disposed on a side of the base 1431 close to the carrier 1433, a second dust ring 14332 is disposed on a side of the carrier 1433 close to the base 1431, and the second dust ring 14332 and the first dust ring 14312 form a dust-proof structure of the voice coil motor 143, so as to prevent stains generated in the focusing process of the voice coil motor 143 from adhering to the lens 141 through a gap between the carrier 1433 and the base 1431. The area surrounded by the projection of the first dust ring 14312 on the projection plane (as shown by the dashed line frame 200 in fig. 4) perpendicular to the axial direction 100 at least partially coincides with the projection of the light through hole 14311 on the projection plane 200, and the area surrounded by the projection of the second dust ring 14332 on the projection plane 200 at least partially coincides with the projection of the mounting hole 14331 on the projection plane 200, so that the first dust ring 14312 and the second dust ring 14332 can satisfy both the dust-proof requirement and the light through requirement of the voice coil motor 143.

It should be noted that, as shown in fig. 6 and 7, an area surrounded by a projection of the first dust ring 14312 on the projection plane 200 may be indicated by a hatching a in fig. 6, and a projection of the light passing hole 14311 on the projection plane 200 may be indicated by a hatching B in fig. 7. Further, the shading a in fig. 6 and the shading B in fig. 7 at least partially coincide, meaning that light rays can reach from one side of the base 1431 to the other side thereof via the light through hole 14311. There is also a relationship between the second dust ring 14332 and the mounting hole 14331, which is similar to the shadow a in fig. 6 and the shadow B in fig. 7, and the description thereof is omitted.

Further, the first dust ring 14312 and the base 1431 may be an integrally formed structural component, and the second dust ring 14332 and the carrier 1433 may also be an integrally formed structural component, so as to increase the structural strength between the first dust ring 14312 and the base 1431 and between the second dust ring 14332 and the carrier 1433, thereby increasing the reliability of the dust-proof structure, and certainly, the forming process of the dust-proof structure may also be reduced to a certain extent.

Referring again to fig. 5, the central axis of the first dust ring 14312 may coincide with the central axis of the light passing hole 14311, and the central axis of the second dust ring 14332 may coincide with the central axis of the mounting hole 14331, which may both coincide with the axial direction 100, so that light may maximally pass through the voice coil motor 143, thereby increasing the reliability of the voice coil motor 143. Further, the diameter of the light passing hole 14311 may be D1, and the inner diameter of the first dust ring 14312 may be D2; the small diameter of the mounting hole 14331 (the inner wall of which is provided with threads) may be D3, and the inner diameter of the second dust ring 14332 may be D4. Wherein, D2 and D1 can be equal, that is, the inner wall of the first dust ring 14312 and the inner wall of the light through hole 14311 can be coplanar, so as to satisfy the light transmission requirement of the light through hole 14311 and the structural strength between the first dust ring 14312 and the base 1431. Of course, in other embodiments, D2 may be larger than D1, which may increase the structural strength between the first dust ring 14312 and the base 1431 by sacrificing the light transmission requirement of the light transmission hole 14311.

The second dust ring 14332 and the first dust ring 14312 are in clearance fit or transition fit to reduce the size of the gap between the second dust ring 14332 and the first dust ring 14312, so as to reduce the probability that the above-mentioned stains adhere to the lens 141 through the gap between the second dust ring 14332 and the first dust ring 14312, thereby increasing the reliability of the voice coil motor 143 in terms of dust prevention. Further, the second dust ring 14332 may be sleeved on the first dust ring 14312, which can meet the above-mentioned dust-proof requirement on one hand, thereby increasing the reliability of the voice coil motor 143; on the other hand, the mating surface between the second dust ring 14332 and the first dust ring 14312 can be located outside the first dust ring 14312, and the impact point between the carrier 1433 and the base 1431 can also be located outside the first dust ring 14312, so that a stain generated by friction between the second dust ring 14332 and the first dust ring 14312 or impact between the carrier 1433 and the base 1431 during focusing of the voice coil motor 143 is prevented from directly adhering to the lens 141, and the reliability of the voice coil motor 143 in terms of dust prevention is further increased. At this time, the difference between D4 and D3 may be greater than or equal to the ring width of the first dust ring 14312, so that D3 may be less than or equal to D2, that is, the first dust ring 14312 can be shielded by the base 1433 in the axis direction 100, thereby preventing the first dust ring 14312 from interfering with the propagation of light in the axis direction 100.

Referring to fig. 5 again, since the carrier 1433 is elastically supported by the upper spring plate 1436 and the lower spring plate 1432 in the axial direction 100, the carrier 1433 can be in a "suspended" state in the axial direction 100 (as shown in the relative position of fig. 5, this time can correspond to a non-working state of the camera module 14), so that the carrier 1433 can press the lower spring plate 1432 to be close to the base 1431, and can press the upper spring plate 1436 to be far from the base 1431, and further, the carrier 1433 can move smoothly. Wherein, the dimension T1 of the first dust ring 14312 in the axial direction 100 is greater than or equal to the stroke of the carrier 1433 in the axial direction 100, and the dimension T2 of the second dust ring 14332 in the axial direction 100 is greater than or equal to the stroke of the carrier 1433 in the axial direction 100. The arrangement is such that, when the carrier 1433 is far away from the base 1431, a certain mating surface is always present between the second dust ring 14332 and the first dust ring 14312, that is, the second dust ring 14332 and the first dust ring 14312 are not completely separated in the axial direction 100, so as to increase the reliability of the voice coil motor 143 in terms of dust prevention.

It should be noted that the above-mentioned stroke is mainly the maximum distance that the lens 141 moves in the process that the voice coil motor 143 drives the lens 141 to approach or move away from the image sensor 142; and specifically may include a downstroke of carrier 1433 toward base 1431 and an upstroke of carrier 1433 away from base 1431. Further, as shown in fig. 5, since the first dust ring 14312 and the second dust ring 14332 are both close to the base 1431, so that the first dust ring 14312 and the second dust ring 14332 can always maintain the fitting relationship in the lower stroke, the present embodiment designs the size relationship between the T1, the T2 and the stroke, mainly to ensure that the first dust ring 14312 and the second dust ring 14332 can also maintain the fitting relationship in the upper stroke, so that the second dust ring 14312 and the first dust ring 14312 cannot be completely separated in the axial direction 100 when the carrier 1433 is far from the base 1431. In other words, the above-mentioned dust-proof structure is effective in the whole stroke (including the above-mentioned up stroke and down stroke) of the voice coil motor 143, that is, the voice coil motor 143 can achieve "full stroke dust-proof" by properly designing the sizes of the first dust-proof ring 14312 and the second dust-proof ring 14312 in the axial direction 100, so as to increase the reliability of the voice coil motor 143 in dust-proof.

Further, as shown in fig. 5, since the second dust ring 14332 is located outside the first dust ring 14312, and the first dust ring 14312 can be shielded by the base 1433 in the axial direction 100, the embodiment of the present application further designs the size relationship between T1 and T2 on the basis of the above-mentioned "full stroke dust prevention", that is, the size T2 of the second dust ring 14332 in the axial direction 100 is greater than or equal to the size T1 of the first dust ring 14312 in the axial direction 100, so that the impact point between the carrier 1433 and the base 1431 can be located outside the first dust ring 14312. This is provided to avoid collision of the first dust ring 14312 with the carrier 1433 as much as possible, thereby effectively reducing the probability of stains (mainly generated by collision) directly adhering to the lens 141.

Referring to fig. 8, fig. 8 is a schematic structural diagram of another embodiment of the dustproof structure shown in fig. 5.

The main difference with the above dustproof structure is that: in this embodiment, the voice coil motor 143 further includes a dust-proof film 1438. One end of the dustproof film 1438 is attached to the base 1431, and the other end of the dustproof film 1438 is attached to the carrier 1433, so that in the process that the carrier 1433 reciprocates relative to the base 1431 along the axis direction 100, the dustproof film 1438 is in a folded state of different degrees along with the reciprocating motion of the carrier 1433. The arrangement is such that the dust-proof film 1438 forms a barrier between the carrier 1433 and the base 1431, so as to prevent stains generated in the focusing process of the voice coil motor 143 from adhering to the lens 141 through the gap between the carrier 1433 and the base 1431, thereby increasing the reliability of the voice coil motor 143 in dust-proof. Therefore, the material of the dust-proof film 1438 may be a flexible material such as polyimide, colorless polyimide, or the like, so that the dust-proof film 1438 can be folded.

It should be noted that the relative position shown in fig. 8 may correspond to the "suspended" condition of carrier 1433 described above; accordingly, the dust cover 1438 may also be in a semi-folded state, i.e., the dust cover 1438 has a certain amount of pre-folding. Further, in the above-described downward stroke, the carrier 1433 gradually approaches the base 1431, and the folding amount of the dust-proof film 1438 gradually increases; during the above-mentioned upper stroke, the carrier 1433 gradually moves away from the base 1431, and the folding amount of the dust-proof film 1438 is gradually reduced. Accordingly, when carrier 1433 moves close to base 1431 to the maximum position of the lower stroke described above, it may be defined that dust-proof membrane 1438 is in a fully folded state; and when the carrier 1433 is moved away from the base 1431 to the maximum position of the upstroke described above, the dust cover 1438 may be defined as being in a fully extended state. The size of the pre-folding amount takes the dustproof film 1438 in a fully unfolded state without being torn as a design standard, so that the reliability of the dustproof film 1438 is ensured. Further, in order to effectively prevent the dust-proof film 1438 from being torn, the dust-proof film 1438 may have a certain folding amount in the entire stroke (including the above-described up-stroke and down-stroke) of the voice coil motor 143.

For example: as shown in fig. 8, the dust-proof film 1438 is disposed between the first dust-proof ring 14312 and the second dust-proof ring 14332, one end of the dust-proof film 1438 is attached to the first dust-proof ring 14312, and the other end of the dust-proof film 1438 is attached to the second dust-proof ring 14332. In this case, the dust-proof film 1438 may have an annular structure, and the distance between the second dust-proof ring 14332 and the first dust-proof ring 14312 is designed to accommodate the dust-proof film 1438 in a fully folded state, thereby increasing the reliability of the voice coil motor 143. In other words, since the dust-proof film 1438 can achieve the dust-proof effect of the dust-proof structure, the fitting relationship between the second dust-proof ring 14332 and the first dust-proof ring 14312 can be weakened to facilitate the arrangement and accommodation of the dust-proof film 1438.

Further, other structures in this embodiment are the same as or similar to those described above, and are not described again here.

The basic structure of the voice coil motor 143 and the matching relationship between the various structural components are briefly described as follows:

referring to fig. 9 to 10 together, fig. 9 is a schematic structural view of the base in fig. 4, fig. 10 is a schematic structural view of the lower elastic sheet in fig. 4, fig. 11 is a schematic structural view of a side of the carrier close to the base in fig. 4, fig. 12 is a schematic structural view of a side of the carrier far from the base in fig. 4, fig. 13 is a schematic structural view of an upper elastic sheet in fig. 4, and fig. 14 is a schematic structural view of the yoke in fig. 4.

As shown in fig. 9, the base 1431 further includes a support post 14313, a lower spring plate positioning post 14314, a first dispensing slot 14315, a solder bump escape slot 14316, and a first striker projection 14317. Among them, support columns 14313 are provided at four corners of the voice coil motor 143 so as to provide magnets 1437. Further, the first striking projection 14317 is located outside the first dust ring 14312 to reduce the probability of stains (mainly generated by the collision) directly adhering to the lens 141.

As shown in fig. 10, the lower spring 1432 includes a carrier lower spring positioning hole 14321, a spring pad 14322, a carrier positioning hole 14323, a lower spring chord 14324, and a fool-proof positioning hole 14325. The lower spring plate 1432 may include two parts separated from each other as shown in fig. 10. Further, the dome pad 14322 is used to fulfill the energization requirements of the coil 1434.

As shown in fig. 11 and 12, the carrier 1433 further includes a carrier positioning post 14333, a second dispensing slot 14334, a fool-proof positioning post 14335, a second striking boss 14336, a third dispensing slot 14337, a third striking boss 14338, and an anti-rotation boss 14339. Wherein the second impact projection 14336 is located outside the second dust ring 14332 to reduce the probability of stains (mainly generated by collisions) directly adhering to the lens 141.

As shown in fig. 13, the upper spring plate 1436 includes an overflow notch 14361, a direction mark 14362, a dispensing hole 14363, an upper spring plate string 14364, and a limit notch 14365. The dispensing holes 14363 may be combination holes, such as three in fig. 13.

As shown in fig. 14, the yoke 1435 further includes a support bench 14352 and a guide 14353. The support bench 14352 and the guide 14353 are correspondingly disposed at four corners of the voice coil motor 143.

Further, the lower spring plate positioning post 14314 is matched with the lower spring plate positioning hole 14321, so that the lower spring plate 1432 and the base 1431 meet the assembling requirement. The first glue dispensing groove 14315 is used to receive glue so as to fix a portion of the lower spring plate 1432 to the base 1431. At this time, the solder bump relief groove 14316 can receive the dome pad 14322 to prevent the lower dome 1432 from structurally interfering with the base 1431.

Carrier positioning posts 14333 mate with carrier positioning holes 14323 to facilitate assembly of carrier 1433 with lower spring plate 1432. The second dispensing slot 14334 is used for accommodating a glue, so as to fix a portion of the lower spring plate 1432 to the carrier 1433. The fool-proof positioning post 14335 is matched with the fool-proof positioning hole 14325, so that the carrier 1433 can be assembled with the lower spring plate 1432 in a correct posture, and the assembly is not reversed. At this time, the lower spring plate 1432 can elastically support the carrier 1433. Additionally, carrier 1433 is able to press lower spring 1432 closer to base 1431 due to the action of lower spring chord 14324.

It should be noted that the second striking protrusion 14336 may protrude from the second dust ring 14332, so that the second striking protrusion 14336 is closer to the base 1433 than the second dust ring 14332, so that the collision between the carrier 1433 and the base 1431 specifically occurs between the second striking protrusion 14336 and the first striking protrusion 14317, thereby increasing the reliability of the second dust ring 14332. Further, as shown in fig. 9 and 11, the second striking protrusion 14336 has a multi-stage structure, and the first striking protrusion 14317 has a multi-stage structure, so as to control the collision area between the carrier 1433 and the base 1431, and to disperse the impact force when the two collide, thereby increasing the reliability of the voice coil motor 143.

Further, magnets 1437 are respectively provided at four corners of the base 1433 (i.e., positions where the supporting pillars 14313 are located), and a coil 1434 is also provided around the outer circumference of the carrier 1433. At this time, the magnet 1437 surrounds the coil 1434 so as to generate a magnetic force pushing the carrier 1433. In addition, since the rotation preventing bosses 14339 can abut against the magnets 1437 in the circumferential direction of the voice coil motor 143, the carrier 1433 is moved in the axial direction 100 by the magnetic force, rather than being "rotated in place".

The limit notch 14365 mates with the third bump boss 14338 to facilitate the assembly of the upper spring 1436 with the carrier 1433. The third dispensing slot 14337 is used for accommodating a dispensing glue, and the dispensing hole 14363 is opposite to the third dispensing slot 14337 in the axial direction 100 so as to fix a portion of the upper spring 1436 to the carrier 1433. Further, another portion of the upper spring plate 1436 is fixed to the magnet 1437 by the flash notch 14361. In addition, the direction indicator 14362 is used to enable the top clip 1436 to be assembled with the carrier 1433 in the correct position, without "flipping back". At this time, the upper spring plate 1436 can elastically support the carrier 1433. Additionally, the carrier 1433 is able to press the upper spring 1436 away from the base 1431 due to the action of the upper spring chord 14364.

The yoke 1435 covers the base 1431 to protect the above structural members. At this time, the support bench 14352 holds the magnet 1437 together with the support column 14313, thereby increasing the reliability of the voice coil motor 143. The guide 14353 is interposed in a gap between the coil 1434 and the carrier 1433, and is clearance-fitted or transition-fitted with the carrier 1433 to play a role of a guide during the movement of the carrier 1433, thereby increasing the reliability of the voice coil motor 143.

As shown in fig. 12, the third striker protrusion 14338 has a multi-step structure, so as to control the collision area between the carrier 1433 and the yoke 1435, and to disperse the impact force when the two collide, thereby increasing the reliability of the voice coil motor 143.

Further, since the carrier 1433 (specifically, the second dust ring 14332) and the base 1431 (specifically, the first dust ring 14312) may be in a clearance fit or a transition fit, and the carrier 1433 and the yoke 1435 (specifically, the guide portion 14353) may also be in a clearance fit or a transition fit, the base 1431 and the yoke 1435 can simultaneously play a role of guiding during the movement of the carrier 1433, so that the movement of the carrier 1433 is more stable, and the reliability of the voice coil motor 143 is further increased.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent devices or equivalent processes that can be directly or indirectly applied to other related technologies, which are made by using the contents of the present specification and the accompanying drawings, are also included in the scope of the present application.

Claims

1. A voice coil motor is characterized by comprising a base, a lower elastic sheet, a carrier, a magnetic yoke and an upper elastic sheet, wherein the base is provided with a light through hole, the lower elastic sheet is connected with the base and elastically contacts with the carrier in the axial direction of the voice coil motor, the carrier is provided with a mounting hole, the magnetic yoke is covered on the base, and the upper elastic sheet is connected with the magnetic yoke and elastically contacts with the carrier in the axial direction; the base is close to one side of the carrier and is provided with a first dustproof ring, an area wrapped by the projection of the first dustproof ring on a projection plane perpendicular to the axis direction is at least partially overlapped with the projection of the light through hole on the projection plane, one side of the carrier close to the base is provided with a second dustproof ring, an area wrapped by the projection of the second dustproof ring on the projection plane is at least partially overlapped with the projection of the mounting hole on the projection plane, and the second dustproof ring and the first dustproof ring form a dustproof structure of the voice coil motor.

2. The voice coil motor of claim 1, wherein a dimension of the first dust ring in the axial direction is greater than or equal to a stroke of the carrier in the axial direction, and a dimension of the second dust ring in the axial direction is greater than or equal to a stroke of the carrier in the axial direction.

3. The voice coil motor of claim 2, wherein a dimension of the second dust collar in the axis direction is greater than or equal to a dimension of the first dust collar in the axis direction.

4. The vcm of claim 1, wherein the second dust ring is in clearance fit or transition fit with the first dust ring.

5. The voice coil motor of claim 4, wherein the second dust ring is sleeved on the first dust ring.

6. The voice coil motor of claim 1, further comprising a dust-proof film, wherein one end of the dust-proof film is attached to the base, and the other end of the dust-proof film is attached to the carrier, so that the dust-proof film follows the reciprocating motion of the carrier to be in a folded state of different degrees during the reciprocating motion of the carrier relative to the base along the axis direction.

7. The voice coil motor of claim 6, wherein the dust-proof film is disposed between the first dust-proof ring and the second dust-proof ring, one end of the dust-proof film is attached to the first dust-proof ring, and the other end of the dust-proof film is attached to the second dust-proof ring.

8. The vcm of claim 1, further comprising a coil wound around the carrier, and a magnet disposed between the yoke and the base and on a side of the coil away from the carrier.

9. A camera module, comprising a lens, an image sensor and the voice coil motor of any one of claims 1 to 8, wherein the lens is disposed in the mounting hole, and the image sensor is disposed on a side of the base away from the carrier and opposite to the lens in an optical axis direction of the camera module.

10. An electronic device, comprising a display module, a rear cover plate, a middle frame and the camera module of claim 9, wherein the display module and the rear cover plate are respectively located at two opposite sides of the middle frame and connected with the middle frame, and the camera module is disposed between the display module and the rear cover plate.