A shrapnel, a lens driving device, a camera module and an electronic device

Abstract

The present invention discloses a shrapnel, a lens driving device, a camera module and an electronic device. The shrapnel includes 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 to connect two components so that the two components tend to move relative to each other along the axial direction. Each elastic arm includes 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. The third elastic part has a plurality of bending segments. In the present invention, each elastic arm includes a first elastic part, a second elastic part, and a third elastic part, and the third elastic part has a plurality of bending segments, so that the elastic arm has a relatively large length, good elasticity, and can provide a relatively large stroke for the connected components.

Description

Technical Field

[0001] The present invention relates to the field of imaging technology, and particularly to a shrapnel, a lens driving device, a camera module and an electronic device. Background Art

[0002] With the progress of science and technology, camera modules are more and more widely used. At present, in addition to cameras, camera modules are equipped on electronic devices such as mobile phones and computers to facilitate people to take pictures anytime and anywhere, bringing convenience and fun to people's lives.

[0003] A key component in a camera module is a lens driving device, which mainly uses electromagnetic thrust to move the lens back and forth, and finally completes the automatic focusing function of the camera. The lens driving device usually sets a stator and a mover that can move relative to each other. The mover is used to carry the lens and is provided with a first magnet. The stator usually includes a base, a housing and a second magnet fixed relative to the base. The mover and the stator move relative to each other through the magnetic force generated by the first magnet and the second magnet. An upper shrapnel is installed between the housing and the mover, and a lower shrapnel is installed between the mover and the base. The upper shrapnel and the lower shrapnel are used to support the mover and make the mover return to its original position in time after moving. There are various different designs for the shapes and structures of the upper shrapnel and the lower shrapnel. However, due to structural limitations, the elasticity is usually insufficient and cannot provide enough stroke for the mover.

[0004] The foregoing description is for the purpose of providing general background information and does not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a shrapnel with better elasticity, a lens driving device, a camera module and an electronic device using such a shrapnel.

[0006] The present invention provides a shrapnel, which includes 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 to connect two components so that the two components tend to move relative to each other along the axial direction. Each elastic arm includes 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. The third elastic part has a plurality of bending segments.

[0007] In one embodiment, both the inner ring and the outer ring are circular rings. The widths of the first elastic part and the second elastic part in the tangential direction are greater than those of the third elastic part, so that the elasticity of the first elastic part and the second elastic part is greater than that of the third elastic part.

[0008] In one embodiment, the first elastic part extends tangentially from a position on the inner side of the outer ring 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 greater than that of the third elastic part.

[0009] In one embodiment, the second elastic part extends tangentially from the outer side of the inner ring for a certain length and then bends back to be connected to the third elastic part, and the length that the second elastic part extends tangentially is greater than the width of the third elastic part in the tangential direction.

[0010] In one embodiment, multiple bending segments of the third elastic part are arranged in the normal direction.

[0011] In one embodiment, the elasticity of the first elastic part is greater than that of the second elastic part.

[0012] In one embodiment, there are eight elastic arms, and every two of them form a group, which are evenly arranged between the inner ring and the outer ring.

[0013] The present invention also provides a lens driving device, including a stator and a rotor. The rotor includes a carrier for carrying a lens and a first magnet fixed to the carrier. The stator includes a base, a housing, and a second magnet fixed relative to the base and opposite to the first magnet. The rotor and the stator move relative to each other by the magnetic force generated by the first magnet and the second magnet. The base and the housing form a receiving cavity to receive the rotor therein. An upper elastic sheet is installed between the housing and the rotor, and a lower elastic sheet is installed between the rotor and the base. The upper elastic sheet is any one of the elastic sheets, and the inner ring and the outer ring are respectively connected to the carrier and the housing.

[0014] In one embodiment, the lower elastic sheet includes four independent elastic members. Each elastic member includes an outer connecting part, an inner connecting part, and a fourth elastic part connected between the outer connecting part and the inner connecting part. The outer connecting part and the inner connecting part are respectively used for connecting the base and the carrier, and the fourth elastic part includes multiple bending segments arranged in the tangential direction.

[0015] In one embodiment, the projection of the base in the vertical direction is in a circular ring shape, and there are four second magnets, all of which are in an arc shape and are arranged on the base.

[0016] In one embodiment, four columns are provided on the upper surface of the base, and a concave part is provided inside each column. A convex part is correspondingly provided at the lower part of the carrier, and the rotation between the carrier and the base is restricted by the cooperation of the convex part and the concave part.

[0017] In one embodiment, the base includes an insulating main body and a reinforcing member. The reinforcing member includes a circular ring body and four cushion bodies evenly arranged on the ring body. The reinforcing member is fixed to the insulating main body by an insert molding method. The ring body is embedded in the insulating main body, and the cushion bodies are located at the positions of the concave parts and at least part of the upper surfaces are exposed from the insulating main body.

[0018] The present invention further provides a camera module, which includes the lens driving device as described above.

[0019] The present invention further provides an electronic device, which includes the camera module as described above.

[0020] For the shrapnel, lens driving device, camera module and electronic device of the present invention, each elastic arm includes a first elastic part, a second elastic part and a third elastic part, and the third elastic part has a plurality of bending segments, so that the elastic arm has a relatively large length, good elasticity, and can provide a relatively large stroke for the connected components. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an exploded schematic view of the lens driving device according to an embodiment of the present invention.

[0022] Figure 2 is Figure 1 a top view of the upper shrapnel in the shown lens driving device.

[0023] Figure 3 is Figure 1 a perspective view of the mover and the base in the shown lens driving device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0025] Please refer to Figures 1 to 3 As shown, in an embodiment of the present invention, the lens driving device includes a stator (not labeled) and a mover (not labeled). The stator includes a base 1 and a housing 2. The base 1 and the housing 2 form a receiving cavity to receive the mover therein. An upper shrapnel 3 is provided between the housing 2 and the mover, and a lower shrapnel 4 is provided between the mover and the base 1, so that the mover can move axially relative to the stator to provide support for the mover and can return to its original position in time.

[0026] 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 includes a second magnet 7 fixed relative to the base 1 and opposite to the first magnet 6. The mover and the stator move relative to each other by the magnetic force generated by the first magnet 6 and the second magnet 7. The first magnet 6 can be a coil capable of adjusting the magnetic field strength, and the magnetic field strength is adjusted by the current passing through the coil to adjust the magnetic force generated between the first magnet 6 and the second magnet 7, thereby controlling the relative movement in the horizontal direction between the mover and the stator.

[0027] In this embodiment, the upper shrapnel 3 includes an inner ring 31, an outer ring 32, and a plurality of elastic arms 33 connected between the inner ring 31 and the outer ring 32.

[0028] Both the inner ring 31 and the outer ring 32 are annular, and are respectively used to connect the carrier 5 and the housing 2, so that the carrier 5 and the housing 2 tend to move relative to each other along the axial direction. The inner ring 31 can be fixed by matching through holes with corresponding convex columns on the carrier 5, and the outer ring 32 can be fixedly connected to the housing 2 by interference between the outer wall and the housing 2, or by being fixedly installed between the housing 2 and the second magnet 7, etc.

[0029] 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. The third elastic portion 333 has a plurality of bending segments. By providing three elastic portions and a plurality of bending segments, the elastic arm has a relatively large length, good elasticity, and can provide sufficient stroke for the mover. In this embodiment, the plurality of bending segments of the third elastic portion 333 are arranged in the normal direction to obtain relatively stable elasticity.

[0030] The widths of the first elastic portion 331 and the second elastic portion 332 in the tangential direction are greater than that of the third elastic portion 333, so that the elasticities of the first elastic portion 331 and the second elastic portion 332 are both greater than that of the third elastic portion 333, and the width of the first elastic portion 331 in the tangential direction is greater than that of the second elastic portion 332, so that the elasticity of the first elastic portion 331 is greater than that of the second elastic portion 332. In this way, by adopting multiple elastic portions and scientific distribution of deformation, the elasticity of the elastic arm 33 is better, not easily plastically deformed, and can provide a larger stroke for the mover.

[0031] Specifically in terms of shape, as Figure 1 、 Figure 2 shown, in this embodiment, the first elastic portion 331 extends tangentially from a position on the inner side of the outer ring 32 away from the third elastic portion 333 to 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 portion 332 extends tangentially from the outer side of the inner ring 31 for a certain length and then turns back to be connected to the third elastic portion 333. The length of the second elastic portion 332 extending tangentially is greater than the width of the third elastic portion 333 in the tangential direction. In this way, by making full use of the space between the inner ring 31 and the outer ring 32, the shapes of the first elastic portion 331, the second elastic portion 332, and the third elastic portion 333 are cleverly designed, and the elasticities of the three elastic portions and the distribution of deformation are determined by the tangential width. Of course, in other embodiments, other methods can also be used to determine the elasticities of the three elastic portions and the distribution of deformation.

[0032] In terms of specific distribution, in this embodiment, there are eight elastic arms 33, each of which is formed into a group of two and is evenly arranged between the inner ring 31 and the outer ring 32. Dividing into four groups and evenly arranged between the inner ring 31 and the outer ring 32 can make the elastic arms 33 evenly stressed and increase their service life. A group of two, symmetrical about the center line of the group, can not only improve the elastic force, but also facilitate processing.

[0033] In this embodiment, the lower elastic sheet 4 includes four independent elastic members, each of which 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 to connect the base 1 and the carrier 5. The fourth elastic portion 43 includes a plurality of bending segments arranged along the tangential direction. The outer connecting portion 41 and the inner connecting portion 42 can be fixed with the convex columns on the base 1 and the carrier 5 by setting through holes.

[0034] like Figure 1 and Figure 3 As shown, in this embodiment, the base 1 is projected in a circular ring shape in the vertical direction, and there are four second magnets 7 , all of which are in an arc shape and are arranged on the base 1 .

[0035] The base 1 includes an insulating body 11 and a reinforcing member 12. Four columns 111 are provided on the upper surface of the insulating body 11, and a recess 112 is provided inside each column 111. A protrusion 51 is provided at the lower part of the carrier 5, and the rotation between the carrier 5 and the base 1 is limited by the cooperation between the protrusion 51 and the recess 112. In addition, the second magnet 7 and the lower spring sheet 4 are both located between the columns 111.

[0036] The reinforcement member 12 includes a circular ring body 121 and four pads 122 evenly arranged on the ring body 121. The reinforcement member 12 is fixed to the insulating body 11 in an embedded molding manner, the ring body 121 is embedded in the insulating body 11, the pads 122 are located at the recessed portion 112 and the upper surface is at least partially exposed to the insulating body 11, so that the pads 122 are opposite to the protruding portion 51 to prevent the protruding portion 51 from colliding with the insulating body 11 and damaging the insulating body 11, thereby affecting normal operation.

[0037] In this embodiment, the outer contours of the housing 2, the carrier 5, and the base 1 are all circular, which can reduce the space occupied by the entire device and save the limited space of electronic devices such as mobile phones.

[0038] The above-mentioned upper spring sheet is not limited to application in the embodiment of the lens driving device. As long as two elements need to be connected and the two elements have a tendency to move relative to each other in the axial direction, the spring sheet structure can be used. Each spring arm includes a first elastic part, a second elastic part, and a third elastic part, and the third elastic part has multiple bending sections. This allows the spring arm to have a larger length and good elasticity, thereby providing a larger stroke for the connected element.

[0039] The present invention also provides an embodiment of a camera module, including the lens driving device as described above.

[0040] The present invention also provides an embodiment of an electronic device, including the camera module as described above.

[0041] In the drawings, for clarity, the dimensions and relative dimensions of layers and regions are exaggerated. It should 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, the element can be directly disposed on the other element, or there can also be an intermediate element. In contrast, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there is no intermediate element.

[0042] In this document, unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] In this document, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the sake of clarity in expressing the technical solution and convenience in description. Therefore, it cannot be construed as a limitation on the present invention.

[0044] In this document, the sequential adjectives "first", "second", etc. used to describe elements are only for distinguishing elements with similar attributes, and do not mean that the elements described in this way must follow a given order, or be restricted by time, space, rank, or others.

[0045] In this document, unless otherwise stated, the meanings of "a plurality of" and "several" are two or more.

[0046] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity in description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0047] In this document, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion. In addition to including the listed elements, it can also include other elements not specifically listed.

[0048] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described above.

Claims

1. A shrapnel piece, characterized in that, It includes 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 to connect two components such that the two components tend to move relative to each other axially. Each of the elastic arms includes 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. The third elastic part has a plurality of bending segments. Both the inner ring and the outer ring are circular rings. The width of the first elastic part and the second elastic part in the tangential direction is greater than that of the third elastic part, so that the elasticity of the first elastic part and the second elastic part is greater than that of the third elastic part; the first elastic part extends tangentially from a position on the inner side of the outer ring 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 greater than that of the third elastic part; the second elastic part extends tangentially from the outer side of the inner ring for a certain length and then turns back to be connected to the third elastic part. The length of the second elastic part extending tangentially is greater than the width of the third elastic part in the tangential direction; the plurality of bending segments of the third elastic part are arranged in the normal direction. The width of the first elastic part in the tangential direction is greater than that of the second elastic part, so that the elasticity of the first elastic part is greater than that of the second elastic part.

2. The shrapnel according to claim 1, characterized in that, There are eight such elastic arms, and every two of them form a group, which are evenly arranged between the inner ring and the outer ring.

3. A lens driving device, characterized in that, It includes a stator and a rotor. The rotor includes a carrier for carrying a lens and a first magnet fixed to the carrier. The stator includes a base, a housing, and a second magnet fixed relative to the base and opposite to the first magnet. The rotor and the stator move relative to each other by the magnetic force generated by the first magnet and the second magnet. The base and the housing form a receiving cavity to receive the rotor therein. An upper elastic sheet is installed between the housing and the rotor, and a lower elastic sheet is installed between the rotor and the base. The upper elastic sheet is the elastic sheet as described in any one of claims 1 to 2. The inner ring and the outer ring are respectively connected to the carrier and the housing. Four columns are provided on the upper surface of the base. A recessed part is provided inside each column. A protruding part is correspondingly provided at the lower part of the carrier. The rotation between the carrier and the base is restricted by the cooperation of the protruding part and the recessed part.

4. The lens driving device according to claim 3, wherein The lower elastic sheet includes four independent elastic members. Each elastic member includes an outer connecting part, an inner connecting part, and a fourth elastic part connected between the outer connecting part and the inner connecting part. The outer connecting part and the inner connecting part are respectively used to connect the base and the carrier. The fourth elastic part includes a plurality of bending segments arranged in the tangential direction.

5. The lens driving device according to claim 3, wherein The projection of the base in the vertical direction is circular. There are four second magnets, all of which are arc-shaped and are arranged on the base.

6. The lens driving device according to claim 3, wherein, The base includes an insulating main body and a reinforcing member. The reinforcing member includes a circular ring body and four cushion bodies evenly arranged on the ring body. The reinforcing member is fixed to the insulating main body by an insert molding method. The ring body is embedded in the insulating main body. The cushion bodies are located at the position of the recessed part and at least part of the upper surface is exposed from the insulating main body.

7. A camera module, characterized in that, It includes a lens driving device as described in any one of claims 3 to 6.

8. An electronic device, characterized in that, Comprising a camera module as described in claim 7.

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