CN111211637A

CN111211637A - Elastic sheet, lens driving device, camera module and electronic equipment

Info

Publication number: CN111211637A
Application number: CN202010126046.3A
Authority: CN
Inventors: 周良
Original assignee: New Shicoh Technology Co Ltd
Current assignee: New Shicoh Motor Co Ltd; New Shicoh Technology Co Ltd
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-05-29

Abstract

The invention discloses an elastic sheet, a lens driving device, a camera module and electronic equipment, wherein the elastic sheet comprises an inner ring, an outer ring and a plurality of elastic arms connected between the inner ring and the outer ring, the inner ring and the outer ring are respectively used for connecting two elements so that the two elements have the tendency of relative movement along the axial direction, each elastic arm comprises a first elastic part connected with the outer ring, a second elastic part connected with the inner ring and a third elastic part connected between the first elastic part and the second elastic part, and the third elastic part is provided with a plurality of bending sections. According to the invention, each elastic arm comprises the first elastic part, the second elastic part and the third elastic part, and the third elastic part is provided with a plurality of bending sections, so that the elastic arm has larger length and good elasticity, and can provide larger stroke for a connected element.

Description

Elastic sheet, lens driving device, camera module and electronic equipment

Technical Field

The present invention relates to the field of imaging technologies, and in particular, to a spring plate, a lens driving device, a camera module, and an electronic device.

Background

With the progress of science and technology, the application of camera modules is more and more extensive, and at present, except cameras, mobile phones, computers and other electronic equipment are equipped with camera modules, so that people can take pictures at any time and any place conveniently, and convenience and fun are brought to the life of people.

One key component in the camera module is a lens driving device, which mainly utilizes electromagnetic thrust to realize the back-and-forth movement of a lens and finally completes the automatic focusing function of the camera. The lens driving device generally includes a stator and a mover, the stator and the mover are movable relative to each other, the mover is used for carrying a lens and is provided with a first magnet, the stator generally includes a base, a housing and a second magnet fixed relative to the base, and the mover and the stator move relative to each other by a magnetic force generated by the first magnet and the second magnet. An upper elastic sheet is arranged between the shell and the rotor, a lower elastic sheet is arranged between the rotor and the base, and the rotor is supported by the upper elastic sheet and the lower elastic sheet and returns to the original position in time after moving. The shape and structure of the upper spring plate and the lower spring plate have various different designs, but due to structural limitation, the elasticity is usually insufficient, and sufficient stroke cannot be provided for the rotor.

The foregoing description is provided for general background information and is not admitted to be prior art.

Disclosure of Invention

The invention aims to provide a spring sheet with better elasticity, and a lens driving device, a camera module and electronic equipment using the spring sheet.

The invention provides a spring plate which comprises an inner ring, an outer ring and a plurality of spring arms connected between the inner ring and the outer ring, wherein the inner ring and the outer ring are respectively used for connecting two elements so that the two elements have the tendency of relatively moving along the axial direction, each spring arm comprises a first elastic part connected with the outer ring, a second elastic part connected with the inner ring and a third elastic part connected between the first elastic part and the second elastic part, and the third elastic part is provided with a plurality of bending sections.

In one embodiment, the inner ring and the outer ring are both circular, and the widths of the first elastic part and the second elastic part in the tangential direction are greater than the widths of the third elastic part, so that the elasticity of the first elastic part and the elasticity of the second elastic part are both greater than the elasticity of the third elastic part.

In one embodiment, the first elastic part extends tangentially from a position on the inner side of the outer ring far away from the third elastic part to the third elastic part, so that the width of the first elastic part in the tangential direction is larger than that of the third elastic part.

In one embodiment, the second elastic part extends from the outer side of the inner ring along the tangential direction for a certain length and then is connected to the third elastic part in a folded mode, and the length of the second elastic part extending along the tangential direction is larger than the width of the third elastic part in the tangential direction.

In one embodiment, the plurality of bent segments of the third elastic portion are arranged in a normal direction.

In one embodiment, the first elastic part has a greater elasticity than the second elastic part.

In one embodiment, the number of the elastic arms is eight, every two elastic arms form a group and are uniformly arranged between the inner ring and the outer ring.

The invention also provides a lens driving device, which comprises a stator and a rotor, wherein the rotor comprises a carrier for bearing a lens and a first magnet fixed on the carrier, the stator comprises a base, a shell and a second magnet fixed relative to the base and opposite to the first magnet, the rotor and the stator move relatively through magnetic force generated by the first magnet and the second magnet, the base and the shell form a containing cavity for containing the rotor, an upper elastic sheet is arranged between the shell and the rotor, a lower elastic sheet is arranged between the rotor and the base, the upper elastic sheet is the elastic sheet as claimed in any one of claims 1 to 7, and the inner ring and the outer ring are respectively connected with the carrier and the shell.

In one embodiment, the lower spring plate includes four independent elastic members, each of the elastic members includes an outer connecting portion, an inner connecting portion and a fourth elastic portion connected between the outer connecting portion and the inner connecting portion, the outer connecting portion and the inner connecting portion are respectively used for connecting the base and the carrier, and the fourth elastic portion includes a plurality of bending sections arranged along the tangential direction.

In one embodiment, the base is in a ring shape in a projection in the vertical direction, and four second magnets, each of which is in an arc shape, are arranged on the base.

In one embodiment, the upper surface of the base is provided with four columns, the inner side of each column is provided with a concave part, the lower part of the carrier is correspondingly provided with a convex part, and the rotation between the carrier and the base is limited by the matching of the convex part and the concave part.

In one embodiment, the base includes an insulating main body and a reinforcing member, the reinforcing member includes a circular ring-shaped ring body and four pad bodies uniformly arranged on the ring body, the reinforcing member is fixed with the insulating main body in an embedding molding manner, the ring body is embedded in the insulating main body, the pad bodies are located at the recessed portions, and at least part of the upper surfaces of the pad bodies are exposed out of the insulating main body.

The invention also provides a camera module comprising the lens driving device.

The invention also provides electronic equipment comprising the camera module.

According to the elastic sheet, the lens driving device, the camera module and the electronic equipment, each elastic arm comprises the first elastic part, the second elastic part and the third elastic part, and the third elastic part is provided with the plurality of bending sections, so that the elastic arm has larger length and good elasticity and can provide larger stroke for connected elements.

Drawings

Fig. 1 is an exploded view of a lens driving device according to an embodiment of the invention.

Fig. 2 is a top view of an upper spring plate in the lens driving apparatus shown in fig. 1.

Fig. 3 is a perspective view of a mover and a base in the lens driving device shown in fig. 1.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Referring to fig. 1 to 3, in an embodiment of the invention, a lens driving apparatus includes a stator (not shown) and a mover (not shown). The stator comprises a base 1 and a shell 2, wherein the base 1 and the shell 2 form an accommodating cavity for accommodating the rotor therein. An upper elastic sheet 3 is arranged between the shell 2 and the rotor, and a lower elastic sheet 4 is arranged between the rotor and the base 1, so that the rotor can move axially relative to the stator to provide support for the rotor and timely restore the original position.

The mover includes a carrier 5 for carrying a lens (not shown) and a first magnet 6 fixed to the carrier 5. The stator further comprises a second magnet 7 fixed with respect to the base 1 and opposite the first magnet 6. The mover and the stator are relatively moved by magnetic forces generated by the first and second magnets 6 and 7. The first magnet 6 may be a coil capable of adjusting the magnetic field strength, and the magnetic field strength is adjusted by the current of the coil to adjust the magnetic force generated between the first magnet 6 and the second magnet 7, thereby controlling the relative motion between the mover and the stator in the horizontal direction.

In this embodiment, the upper spring plate 3 includes an inner ring 31, an outer ring 32, and a plurality of spring arms 33 connected between the inner ring 31 and the outer ring 32.

The inner ring 31 and the outer ring 32 are both annular and are used to connect the carrier 5 and the housing 2, respectively, so that the carrier 5 and the housing 2 tend to move relatively in the axial direction. The inner ring 31 can be fixed with the corresponding convex column on the carrier 5 by the through hole, and the outer ring 32 can be fixed with the shell 2 by the interference of the outer wall, or fixed between the shell 2 and the second magnet 7.

Each elastic arm 33 includes a first elastic portion 331 connected to the outer ring 32, a second elastic portion 332 connected to the inner ring 31, and a third elastic portion 333 connected between the first elastic portion 331 and the second elastic portion 332, wherein the third elastic portion 333 has a plurality of bending sections. Through setting up three elastic component and a plurality of bending segment for the bullet arm has great length, and elasticity is good, can provide sufficient stroke for the active cell. In this embodiment, the plurality of bending sections of the third elastic portion 333 are arranged along the normal direction, so as to obtain more stable elasticity.

The widths of the first elastic part 331 and the second elastic part 332 in the tangential direction are greater than the third elastic part 333, so that the elasticity of both the first elastic part 331 and the second elastic part 332 is greater than the third elastic part 333, and the width of the first elastic part 331 in the tangential direction is greater than the second elastic part 332, so that the elasticity of the first elastic part 331 is greater than that of the second elastic part 332. By adopting a plurality of elastic parts and scientific distribution of deformation, the elastic arm 33 has better elasticity and is not easy to deform plastically, and a larger stroke can be provided for the mover.

Specifically, as shown in fig. 1 and 2, in the present embodiment, the first elastic portion 331 extends tangentially to the third elastic portion 333 from a position inside the outer ring 32 away from the third elastic portion 333, so that the width of the first elastic portion 331 in the tangential direction is greater than that of the third elastic portion 333. The second elastic part 332 extends from the outer side of the inner ring 31 along the tangential direction for a certain length and then is folded and connected to the third elastic part 333, and the length of the second elastic part 332 extending along the tangential direction is greater than the width of the third elastic part 333 along the tangential direction. In this way, by making full use of the space between the inner race 31 and the outer race 32, the shapes of the first elastic portion 331, the second elastic portion 332, and the third elastic portion 333 are designed skillfully, and the level of elasticity and the distribution of deformation among the three elastic portions are determined by the tangential width. Of course, in other embodiments, the elastic height and distribution of deformation among the three elastic portions may be determined in other ways.

In a specific distribution, in this embodiment, the number of the elastic arms 33 is eight, and each two elastic arms are combined into a group and uniformly arranged between the inner ring 31 and the outer ring 32. The elastic arms 33 are uniformly stressed and the service life of the elastic arms is prolonged by being uniformly arranged between the inner ring 31 and the outer ring 32 in four groups. And the two groups are symmetrical about the central line of the group, so that the elasticity can be improved, and the processing is convenient.

In this embodiment, the lower elastic sheet 4 includes four independent elastic members, each elastic member includes an outer connecting portion 41, an inner connecting portion 42 and a fourth elastic portion 43 connected between the outer connecting portion 41 and the inner connecting portion 42, the outer connecting portion 41 and the inner connecting portion 42 are respectively used for connecting the base 1 and the carrier 5, and the fourth elastic portion 43 includes a plurality of bending sections arranged along the tangential direction. The outer connecting part 41 and the inner connecting part 42 can be matched and fixed with the convex columns on the base 1 and the carrier 5 through the arrangement of the through holes.

As shown in fig. 1 and 3, in the present embodiment, the base 1 has a ring shape in vertical projection, and four second magnets 7, each having an arc shape, are disposed on the base 1.

The base 1 includes an insulating main body 11 and a reinforcing member 12. The upper surface of the insulating main body 11 is provided with four pillars 111, and the inner side of each pillar 111 is provided with a recess 112. The lower part of the carrier 5 is correspondingly provided with a convex part 51, and the rotation between the carrier 5 and the base 1 is limited by the matching of the convex part 51 and the concave part 112. And, second magnet 7, lower shell fragment 4 are all located between each stand 111.

The reinforcement 12 includes a circular ring body 121 and four pads 122 uniformly disposed on the ring body 121. The reinforcement 12 is fixed to the insulating body 11 by insert molding, the ring body 121 is embedded in the insulating body 11, the pad 122 is located at the recess 112, and at least a portion of the upper surface of the pad is exposed out of the insulating body 11, so that the pad 122 is opposite to the protrusion 51, and the protrusion 51 is prevented from colliding with the insulating body 11 to damage the insulating body 11, which may affect normal operation.

In this embodiment, the outer contours of the housing 2, the carrier 5 and the base 1 are all circular, so that the occupied space of the whole device can be reduced, and the limited space of electronic equipment such as a mobile phone is saved.

The upper elastic sheet is not limited to be applied to the embodiment of the lens driving device, and the elastic sheet structure can be adopted as long as two elements are required to be connected and have a tendency of relatively moving along the axial direction, each elastic arm can comprise a first elastic part, a second elastic part and a third elastic part, and the third elastic part is provided with a plurality of bending sections, so that the elastic arm has a larger length and good elasticity, and can provide a larger stroke for the connected elements.

The invention also provides an embodiment of a camera module, which comprises the lens driving device.

The invention also provides an embodiment of an electronic device, which comprises the camera module.

In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. It will be understood that when an element such as a layer, region or substrate is referred to as being "formed on," "disposed on" or "located on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there are no intervening elements present.

In this document, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms can be understood in a specific case to those of ordinary skill in the art.

In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the purpose of clarity and convenience of description of the technical solutions, and thus, should not be construed as limiting the present invention.

As used herein, the ordinal adjectives "first", "second", etc., used to describe an element are merely to distinguish between similar elements and do not imply that the elements so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

As used herein, the meaning of "a plurality" or "a plurality" is two or more unless otherwise specified.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. An elastic sheet is characterized by comprising an inner ring, an outer ring and a plurality of elastic arms connected between the inner ring and the outer ring, wherein the inner ring and the outer ring are respectively used for connecting two elements to enable the two elements to have the tendency of relative movement along the axial direction, each elastic arm comprises a first elastic part connected to the outer ring, a second elastic part connected to the inner ring and a third elastic part connected between the first elastic part and the second elastic part, and the third elastic part is provided with a plurality of bending sections.

2. The shrapnel of claim 1, wherein the inner ring and the outer ring are both circular rings, and the widths of the first elastic part and the second elastic part in the tangential direction are larger than the width of the third elastic part, so that the elasticity of the first elastic part and the elasticity of the second elastic part are both larger than the elasticity of the third elastic part.

3. The spring according to claim 2, wherein the first elastic portion extends tangentially from a position inside the outer ring away from the third elastic portion to the third elastic portion, such that the first elastic portion has a greater width in the tangential direction than the third elastic portion.

4. The shrapnel of claim 2, wherein the second elastic part extends from the outer side of the inner ring along the tangential direction for a certain length and then is connected with the third elastic part in a folded mode, and the length of the second elastic part extending along the tangential direction is larger than the width of the third elastic part in the tangential direction.

5. The shrapnel of claim 2, wherein the plurality of bent sections of the third elastic part are arranged along a normal direction.

6. An elastic sheet according to any one of claims 1 to 5, wherein said first elastic portion has a width in a tangential direction larger than said second elastic portion, so that said first elastic portion has an elasticity larger than said second elastic portion.

7. An elastic piece according to any one of claims 1 to 5, wherein eight elastic arms are provided, and each two elastic arms are grouped into a group and uniformly arranged between the inner ring and the outer ring.

8. A lens driving device is characterized by comprising a stator and a rotor, wherein the rotor comprises a carrier for bearing a lens and a first magnet fixed on the carrier, the stator comprises a base, a shell and a second magnet fixed relative to the base and opposite to the first magnet, the rotor and the stator move relatively through magnetic force generated by the first magnet and the second magnet, the base and the shell form a containing cavity for containing the rotor, an upper elastic sheet is arranged between the shell and the rotor, a lower elastic sheet is arranged between the rotor and the base, the upper elastic sheet is the elastic sheet according to any one of claims 1 to 7, and the inner ring and the outer ring are respectively connected with the carrier and the shell.

9. The lens driving device as claimed in claim 8, wherein the lower resilient plate comprises four independent resilient members, each resilient member comprises an outer connecting portion, an inner connecting portion and a fourth resilient portion connected between the outer connecting portion and the inner connecting portion, the outer connecting portion and the inner connecting portion are respectively used for connecting the base and the carrier, and the fourth resilient portion comprises a plurality of bending sections arranged along a tangential direction.

10. The lens driving apparatus as claimed in claim 8, wherein the base has a ring shape in a vertical projection, and four of the second magnets, each having a circular arc shape, are provided on the base.

11. The lens driving apparatus as claimed in claim 8, wherein the base has four pillars on an upper surface thereof, each of the pillars has a recess on an inner side thereof, and the carrier has a protrusion on a lower portion thereof, the protrusion and the recess cooperating to restrict rotation between the carrier and the base.

12. The lens driving device as claimed in claim 11, wherein the base includes an insulating main body and a reinforcement, the reinforcement includes a circular ring-shaped collar and four pads uniformly disposed on the collar, the reinforcement is embedded and molded to be fixed to the insulating main body, the collar is embedded in the insulating main body, the pads are located at the recessed portions, and the upper surface of the pads is at least partially exposed from the insulating main body.

13. A camera module comprising the lens driving device according to any one of claims 8 to 12.

14. An electronic device comprising the camera module of claim 13.