Drive device, camera module and electronic equipment

Abstract

A driving device, a camera module and an electronic device, the driving device comprises a base, a carrier and a driving member, the carrier is arranged on the base and can move up and down relative to the base, the first end of the driving member is fixedly connected to the base, the second end opposite to the first end is fixedly connected to the carrier, the part between the first end and the second end of the driving member is connected to the carrier, the part between the first end and the second end has a height difference with the first end in the up and down direction, and the driving member can be retracted to drive the carrier to move up and down relative to the base. In the driving device, camera module and electronic device of the present invention, since one end of the driving member is fixed to the base and the other end can move with the carrier, the conversion rate of the contraction amount of the driving member into the displacement of the carrier is high. At the same time, since the conversion rate of the contraction amount of the driving member into the displacement of the carrier is high, the required line length of the driving member is shorter, thereby reducing the space occupied by it, which is conducive to the miniaturization of the driving device; and the smaller the contraction amount of the driving member, the longer its life will be, which is conducive to extending the service life of the driving device.

Description

Technical Field

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

[0002] With the advancement of science and technology, the application of camera modules is becoming more and more extensive. At present, in addition to cameras, mobile phones, computers and other electronic products are equipped with camera modules to facilitate people to take pictures anytime and anywhere, bringing convenience and fun to people's lives. Camera modules include fixed-focus camera modules and zoom camera modules. In the zoom camera module, the lens can be driven to move by a driving device to achieve focus.

[0003] A driving device includes a base, a carrier and a memory alloy (SMA) component. The carrier is movably arranged on the base, the two ends of the memory alloy component are fixed on the base, and the middle part is hung on the carrier. When the memory alloy component is powered on, its length will be shortened, thereby pulling the carrier to move up and down. The carrier can drive the lens installed on the carrier to move up and down to achieve focusing. In this driving device, if Figure 1 As shown, when the displacement of the carrier is H, the linear length of the memory alloy component changes to 2*(L1-L2), where L1 is the distance from one end of the memory alloy component to the position where the carrier is hung before it is shortened, and L2 is the distance from one end of the memory alloy component to the position where the carrier is hung after it is shortened. It can be seen that the conversion rate of the shrinkage of the memory alloy component to the carrier displacement H is low. Therefore, on the one hand, due to the low conversion rate of the shrinkage of the memory alloy component to the carrier displacement H, the memory alloy component needs to be longer, which will occupy more space and is not conducive to the miniaturization of the drive device; on the other hand, the longer the memory alloy component shrinks, the shorter its life will be. The conversion rate of the shrinkage of the memory alloy component to the carrier displacement H is low, resulting in a large shrinkage of the memory alloy component, which will have an adverse effect on the service life of the drive device.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Summary of the invention

[0005] The object of the present invention is to provide a driving device, a camera module and an electronic device, wherein the driving member has a higher contraction-displacement conversion rate.

[0006] The present invention provides a driving device, comprising a base, a carrier and a driving member, wherein the carrier is arranged on the base and can move up and down relative to the base, the first end of the driving member is fixedly connected to the base, the second end opposite to the first end is fixedly connected to the carrier, the part between the first end and the second end of the driving member is connected to the carrier, the part between the first end and the second end has a height difference with the first end in the up and down direction, and the driving member can be retracted to drive the carrier to move up and down relative to the base.

[0007] In one embodiment, the driving element is a memory alloy wire.

[0008] In one embodiment, the base includes a first terminal and a second terminal, the first terminal and the second terminal are spaced apart from each other; and the first end of the driving member is fixedly connected to the first terminal.

[0009] In one embodiment, the driving device further includes a first wire clamping terminal and a second wire clamping terminal, the first wire clamping terminal and the second wire clamping terminal respectively clamp the first end and the second end of the driving member, the first wire clamping terminal is connected to the first terminal, and the second wire clamping terminal is fixedly connected to the carrier.

[0010] In one embodiment, the driving device also includes a lower spring, the first terminal and the second terminal are made of conductive material, the first clamping terminal is electrically connected to the first terminal, the second clamping terminal is electrically connected to the lower spring, and the lower spring is electrically connected to the second terminal.

[0011] In one embodiment, the carrier includes two hanging blocks, and there are two driving members. The portion between the first end and the second end of one driving member is hung on the bottom of one hanging block to provide an upward force to the carrier, and the portion between the first end and the second end of another driving member is hung on the top of another hanging block to provide a downward force to the carrier.

[0012] In one embodiment, the two driving members are respectively disposed at outer edges of two opposite sides of the carrier.

[0013] In one embodiment, the driving device also includes an upper spring and a shell, wherein the upper spring is elastically arranged between the carrier and the shell, the shell is arranged on the carrier, and the base, the carrier, the driving member and the upper spring cover are arranged in the shell.

[0014] The present invention also provides a camera module, comprising the above-mentioned driving device.

[0015] The present invention also provides an electronic device, comprising the camera module.

[0016] In the drive device, camera module and electronic device of the present invention, since one end of the drive member is fixed to the base and the other end can move with the carrier, the conversion rate of the contraction amount of the drive member in the drive device into the displacement of the carrier is high. At the same time, since the conversion rate of the contraction amount of the drive member into the displacement of the carrier is high, the required line length of the drive member is shorter, thereby reducing the space occupied by the drive member, which is conducive to the miniaturization of the drive device; and, the smaller the contraction amount of the drive member, the longer its life will be, which is conducive to extending the service life of the drive device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the contraction of a memory alloy wire of a driving device.

[0018] Figure 2 It is a schematic diagram of the three-dimensional assembly structure of a driving device according to an embodiment of the present invention.

[0019] Figure 3 for Figure 2 A schematic diagram of the exploded structure of the driving device in one direction is shown.

[0020] Figure 4 for Figure 2 A schematic diagram of the exploded structure of the driving device shown in another direction.

[0021] Figure 5 for Figure 2 The schematic diagram of the structure of the driving device shown is shown without the outer shell.

[0022] Figure 6 for Figure 2 A schematic cross-sectional view of the drive device shown.

[0023] Figure 7 for Figure 2 Schematic diagram of the contraction of the driving member of the driving device shown.

[0024] Figure 8 for Figure 1 Schematic diagram of the contraction principle of the memory alloy wire of the driving device shown.

[0025] Fig. 9 for Figure 2 Schematic diagram of the contraction principle of the driving member of the driving device shown. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] Please refer to Figures 2 to 6 The driving device provided in one embodiment of the present invention comprises a base 10, a carrier 12, a driving member 14, a lower spring 16, an upper spring 18 and a housing 20. The carrier 12 is arranged on the base 10 and can move up and down relative to the base 10. The first end of the driving member 14 is fixedly connected to the base 10, the second end opposite to the first end is fixedly connected to the carrier 12, the part between the first end and the second end of the driving member 14 is connected to the carrier 12, and the driving member 14 can be retracted to drive the carrier 12 to move up and down relative to the base 10. Specifically, the part between the first end and the second end has a height with the first end in the up and down direction. The lower spring 16 is elastically arranged between the base 10 and the carrier 12, and the upper spring 18 is elastically arranged between the carrier 12 and the housing 20. The housing 20 is arranged on the carrier 12, and the base 10, the carrier 12, the driving member 14, the lower spring 16 and the upper spring 18 are covered in the housing 20, and specifically, the housing 20 is also fixedly connected to the base 10.

[0028] In this embodiment, the base 10 includes a first terminal 102 and a second terminal 104, which are made of conductive materials and are spaced apart from each other. The first terminal 102 and the second terminal 104 can be embedded in the base 10 by insert molding. Specifically, a first convex column 106 is provided on the base 10. A convex block 107 is also provided on the base 10, and a second convex column 108 is provided on the convex block 107. In this specific embodiment, the first terminal 102 and the second terminal 104 are connected to an external power supply, and there are two first terminals 102 and two second terminals 104, respectively.

[0029] In this embodiment, a hanging block 122, a third convex column 124 and a fourth convex column 126 are provided on the carrier 12. In this specific embodiment, there are two hanging blocks 122, which are respectively provided at the central part of two opposite outer sides of the carrier 12 and protrude outwards, and the fourth convex column 126 is provided at the bottom of the carrier 12. The carrier 12 is used to install a lens (not shown) to drive the lens to move up and down to achieve focusing.

[0030] In this embodiment, the driving member 14 is a memory alloy wire. Specifically, in this embodiment, there are two driving members 14. The portion between the first end and the second end of the driving member 14 is hung on the hanging block 122 of the carrier 12. Specifically, the portion between the first end and the second end of one driving member 14 is hung on the bottom of the hanging block 122 to provide an upward force to the carrier 12 when it is contracted. Specifically, the portion between the first end and the second end of the driving member 14 is located below the first end, and the driving member 14 is in a downward curve shape as a whole. The portion between the first end and the second end of the other driving member 14 is hung on the top of the hanging block 122 to provide a downward force to the carrier 12 when it is contracted. Specifically, the portion between the first end and the second end of the driving member 14 is located above the first end, and the driving member 14 is in an upward curve shape as a whole. In this way, when one driving member 14 contracts, it drives the carrier 12 to move upward, and when the other driving member 14 contracts, it drives the carrier 12 to move downward, and the driving member 14 maintains the above-mentioned curve shape during movement. Specifically, two driving members 14 are respectively arranged at the outer edges of two opposite sides of the carrier 12. It is understood that there may be only one driving member 14, in which case the lower spring 16 and the upper spring 18 are required to help the driving member 14 to reset after moving. It is understood that the portion between the first end and the second end of the driving member 14 may also be fixed on the carrier 12.

[0031] In this embodiment, the driving device further includes a first clamping terminal 22 and a second clamping terminal 24. The first clamping terminal 22 and the second clamping terminal 24 clamp the first end and the second end of the driving member 14 respectively. The first clamping terminal 22 is connected to the first terminal 102 and electrically connected to the first terminal 102. The second clamping terminal 24 is electrically connected to the lower spring 16. The lower spring 16 is electrically connected to the second terminal 104. The second clamping terminal 24 is fixedly connected to the carrier 12. In this way, the driving member 14 is electrically connected to the first terminal 102 and the second terminal 104, so that the driving member 14 is energized. The memory alloy wire will shrink when energized, and the memory alloy wire can be extended and retracted. At the same time, the first end of the driving member 14 is fixedly connected to the base 10, and the second end is fixedly connected to the carrier 12. Specifically, the second clamping terminal 24 is electrically connected to the lower spring 16 through the connector 25. The first clamping terminal 22 is provided with a first fixing hole and a second fixing hole, one end of the first terminal 102 is inserted into the first fixing hole, and the second protrusion 108 is inserted into the second fixing hole. The second clamping terminal 24 is provided with a third fixing hole, and the third protrusion 124 is inserted into the third fixing hole. Specifically in the present embodiment, there are two first clamping terminals 22 and second clamping terminals 24, respectively, to clamp two driving members 14, respectively. Correspondingly, there are also two lower springs 16, and the connection method of the two driving members 14 is the same as that of the first clamping terminal 22 and the second clamping terminal 24, which will not be repeated here.

[0032] Specifically, the lower spring 16 includes a first part and a second part, the first part is provided with a first connecting hole 162, the first boss 106 of the base 10 is inserted into the first connecting hole 162 to fix the first part of the lower spring 16 to the base 10, and the second part is provided with a second connecting hole 164, the fourth boss of the carrier 12 is inserted into the second connecting hole 164 to fix the second part of the lower spring 16 to the carrier 12.

[0033] In this embodiment, the upper spring 18 includes a third portion and a fourth portion. The third portion is fixedly connected to the carrier 12 , and the fourth portion is fixedly connected to the housing 20 , so as to elastically connect the carrier 12 and the housing 20 .

[0034] In the driving device, since one end of the driving member 14 is fixed to the base 10, the other end can move with the carrier 12. Figure 7 As shown, when the displacement of the carrier is H, the line length of the driving member 14 changes to (L1-L2), where L1 is the distance from the first end of the driving member 14 to the connection between the middle part and the carrier 12 before it is shortened, and L2 is the distance from the first end of the driving member 14 to the connection between the middle part and the carrier 12 after it is shortened. It can be seen that, compared with the driving device in the prior art, the change in the line length of the driving member 14 is reduced by half when the carrier moves the same stroke. Therefore, the conversion rate of the contraction amount of the driving member 14 into the displacement of the carrier in the driving device is relatively high. At the same time, since the conversion rate of the contraction amount of the driving member 14 into the displacement of the carrier is relatively high, the required line length of the driving member 14 is relatively short, thereby reducing the space it occupies, which is conducive to the miniaturization of the driving device; and, the smaller the contraction amount of the driving member 14, the longer its life will be, which is conducive to extending the service life of the driving device.

[0035] Please refer to Figure 8 , is a schematic diagram of the contraction amount of the memory alloy wire when the carrier 12 moves upward to a height H in the prior art. When the middle part of the memory alloy wire (i.e., the part connected to the carrier) moves upward to a height H, the left and right sides of the memory alloy wire contract by H respectively, and the total contraction amount is 2H. Please refer to Fig. 9 , is a schematic diagram of the contraction amount of the memory alloy wire when the carrier 12 moves upward by a height H in the present invention. When the middle part of the memory alloy wire (i.e., the part connected to the carrier) moves upward by a height H, the left end of the memory alloy wire also moves upward by a height H, that is, the left side of the memory alloy wire does not contract, and the right end of the memory alloy wire contracts by H, and the overall contraction amount is H. It can be seen that the conversion rate of the contraction amount of the driving member 14 into the displacement of the carrier in the present driving device is relatively high.

[0036] In this embodiment, a guide rail (not shown) is provided on one of the base 10 and the carrier 12, and a guide groove cooperating with the guide rail is provided on the other. Since one end and the middle part of the driving member 14 are movable, and the other end is fixed, the driving member 14 will generate a force with a certain angle to the vertical direction on the carrier 12, and this force will cause the carrier 12 to rotate, and the provision of the guide rail and the guide groove can prevent the carrier 12 from rotating relative to the base 10. It can be understood that the guide rail or the guide groove can also be provided on the housing 20 instead of the base 10. It can be understood that a stopper can also be provided on the carrier 12 to prevent it from rotating.

[0037] The present invention also provides a camera module, comprising the above-mentioned driving device.

[0038] The present invention also provides an electronic device, comprising the camera module.

[0039] In the accompanying drawings, the sizes and relative sizes of layers and regions are exaggerated for clarity. 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 may be disposed directly on the other element, or there may be intervening elements. Conversely, when an element is referred to as being "formed directly on" or "disposed directly on" another element, there are no intervening elements.

[0040] In this document, unless otherwise specified or limited, the terms "installed", "connected", and "connected" 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 a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0041] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of expressing the technical solutions and the convenience of description, and therefore should not be understood as limitations of the present invention.

[0042] In this document, the ordinal adjectives “first”, “second”, etc. used to describe elements are only used to distinguish elements with similar attributes, and do not mean that the elements described in this way must follow a given order, or time, space, level or other limitations.

[0043] As used herein, unless otherwise specified, “plurality” or “several” means two or more.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0046] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A driving device, comprising a base (10), a carrier (12) and a driving member (14), wherein the carrier (12) is arranged on the base (10) and can move up and down relative to the base (10), characterized in that: The first end of the driving member (14) is fixedly connected to the base (10), and the second end opposite to the first end is fixedly connected to the carrier (12); the portion between the first end and the second end of the driving member (14) is connected to the carrier (12), and the portion between the first end and the second end has a height difference with the first end in the up-down direction; the driving member (14) is retractable to drive the carrier (12) to move up and down relative to the base (10); a guide rail is provided on one of the base (10) and the carrier (12), and a guide groove cooperating with the guide rail is provided on the other to prevent the base (10) and the carrier (12) from rotating relative to each other.

2. The driving device according to claim 1, characterized in that: The driving member (14) is a memory alloy wire.

3. The driving device according to claim 1, characterized in that: The base (10) comprises a first terminal (102) and a second terminal (104), wherein the first terminal (102) and the second terminal (104) are arranged at an interval from each other; and the first end of the driving member (14) is fixedly connected to the first terminal (102).

4. The driving device according to claim 3, characterized in that: The driving device further comprises a first clamping terminal (22) and a second clamping terminal (24), wherein the first clamping terminal (22) and the second clamping terminal (24) respectively clamp the first end and the second end of the driving member (14), the first clamping terminal (22) is connected to the first terminal (102), and the second clamping terminal (24) is fixedly connected to the carrier (12).

5. The driving device according to claim 4, characterized in that: The driving device also includes a lower spring (16), the first terminal (102) and the second terminal (104) are made of conductive material, the first clamping terminal (22) is electrically connected to the first terminal (102), the second clamping terminal (24) is electrically connected to the lower spring (16), and the lower spring (16) is electrically connected to the second terminal (104).

6. The driving device according to claim 1, characterized in that: The carrier (12) comprises two hanging blocks (122), and there are two driving members (14). The portion between the first end and the second end of one driving member (14) is hung on the bottom of one hanging block (122) to provide an upward force to the carrier (12), and the portion between the first end and the second end of another driving member (14) is hung on the top of another hanging block (122) to provide a downward force to the carrier (12).

7. The driving device according to claim 6, characterized in that: The two driving members (14) are respectively arranged at outer edges of two opposite sides of the carrier (12).

8. The driving device according to claim 1, characterized in that: The driving device further comprises an upper spring (18) and a housing (20), wherein the upper spring (18) is elastically arranged between the carrier (12) and the housing (20), and the housing (20) is arranged on the carrier (12), and the base (10), the carrier (12), the driving member (14) and the upper spring (18) are covered in the housing (20).

9. A camera module, characterized in that: Comprising a driving device as described in any one of claims 1-8.

10. An electronic device, characterized in that: Comprising the camera module as claimed in claim 9.

Images