CN215340502U - Lens driving device - Google Patents
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- CN215340502U CN215340502U CN202121814754.2U CN202121814754U CN215340502U CN 215340502 U CN215340502 U CN 215340502U CN 202121814754 U CN202121814754 U CN 202121814754U CN 215340502 U CN215340502 U CN 215340502U
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Abstract
The utility model discloses a lens driving device which comprises a base, a first carrier, a second carrier, a third carrier, a first piezoelectric driving mechanism, a second piezoelectric driving mechanism and a third piezoelectric driving mechanism which are mutually independent, wherein the first carrier is arranged on the base, the second carrier is arranged on the first carrier, the third carrier is arranged in the second carrier, the first piezoelectric driving mechanism and the second piezoelectric driving mechanism are respectively used for driving the first carrier and the second carrier to move along a first direction and a second direction which are mutually vertical on a plane which is vertical to an optical axis, and the third piezoelectric driving mechanism is used for driving the third carrier to move along the optical axis. The utility model adopts a brand new piezoelectric driving mode to realize the movement of the lens in three directions, thereby realizing the automatic focusing function along the optical axis direction and realizing the optical anti-shake function along the movement of the first direction and the second direction which are vertical to the optical axis direction, and the performance is reliable.
Description
Technical Field
The utility model relates to the field of optical imaging, in particular to a lens driving device.
Background
The motor of the geared lens driving device is typically mounted within the camera module of the mobile phone and is typically driven by an electromagnetic combination of magnets and coils, which generate a magnetic field that interferes with other electronic components such as the interior of the mobile phone. In addition, the suspension wires, the reeds and the like are usually adopted for assistance, and the irreversible deformation problems such as metal fatigue and metal deformation can be caused after the metal fatigue is suffered from impact.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a lens driving device to solve the above problems in the prior art.
In order to solve the above problem, according to an aspect of the present invention, there is provided a lens driving device including a base, a first carrier, a second carrier, a third carrier, a first piezoelectric driving mechanism, a second piezoelectric driving mechanism, and a third piezoelectric driving mechanism, which are independent of each other, the first carrier being disposed on the base, the second carrier being disposed on the first carrier, the third carrier being disposed in the second carrier, and the first piezoelectric driving mechanism and the second piezoelectric driving mechanism being configured to drive the first carrier and the second carrier to move in a first direction and a second direction perpendicular to each other on a plane perpendicular to an optical axis, respectively, and the third piezoelectric driving mechanism being configured to drive the third carrier to move in the optical axis direction.
In one embodiment, the lens driving apparatus is configured to: when the first carrier moves along the first direction, the first carrier, the second carrier and the third carrier are relatively fixed; when the second carrier moves along the second direction, the second carrier and the third carrier are relatively fixed; and when the third carrier moves along the optical axis direction, the base, the first carrier and the second carrier are relatively fixed.
In one embodiment, the first carrier has a first height h1Said second support having a second height h2The third carrier has a third height h3Wherein the first height h1Second height h2And a third height h3Has the following relationship:
h3＜h1the movement stroke h of the third carrier satisfies the following relation: h is less than or equal to h1-h3(ii) a Or
h3＜h2The movement stroke h of the third carrier satisfies the following relation: h is less than or equal to h2-h3。
In one embodiment, the first piezoelectric drive mechanism includes a first mass and a first piezoelectric element mounted on the base, a first friction member mounted on the first carrier and in frictional engagement with the first friction member, and a first clamp disposed within the first clamp and in end engagement with the first piezoelectric element to drive movement of the first carrier when the first piezoelectric element is energized.
In one embodiment, the second piezoelectric drive mechanism includes a second mass, a second piezoelectric element, a second friction member, and a second clamp, the second mass and the second piezoelectric element being mounted on the first carrier, the second clamp being fixedly mounted on the second carrier, the second friction member being disposed within the second clamp and cooperating at an end with the second piezoelectric element to drive the second carrier to move when the second piezoelectric element is energized.
In one embodiment, the third piezoelectric drive mechanism includes a third mass, a third piezoelectric element, a third friction member, and a third clamping member, the third mass and the third piezoelectric element being mounted on the base, the third clamping member being fixedly mounted on the third carrier, the third friction member being disposed within the third clamping member and cooperating at an end with the third piezoelectric element to drive the third carrier to move when the third piezoelectric element is energized.
In one embodiment, the first carrier is connected to the base by a first guide, and the second carrier is connected to the first carrier by a second guide.
In one embodiment, the first guide member is a first guide rod, the first guide rod is fixedly arranged on the base, and the first carrier is provided with a first guide groove matched with the first guide rod; and the second guide piece is a second guide rod, the second guide rod is fixedly arranged on the first carrier, and the second carrier is provided with a second guide groove matched with the second guide rod.
In one embodiment, the guide bar and the first piezoelectric mechanism of the first carrier are respectively disposed at two opposite corners of the base, and the second piezoelectric mechanism and the second guide bar of the second carrier are respectively disposed at two opposite corners of the first carrier.
In one embodiment, the second carrier has a second cylindrical body, the third carrier has a third cylindrical body mounted within the second cylindrical body and an outer surface of the third cylindrical body engages the outer surface of the second cylindrical body and guides the third carrier as the third carrier moves.
In one embodiment, the first direction, the second direction and the optical axis direction are respectively provided with a position sensor and a corresponding induction magnet to respectively detect the displacement of the first carrier, the second carrier and the third carrier in the first direction, the second direction and the optical axis direction.
In one embodiment, the lens driving apparatus further includes a first circuit board, a second circuit board, and a third circuit board that are respectively disposed at three sides of the lens driving apparatus and respectively supply power to the first piezoelectric element, the second piezoelectric element, and the third piezoelectric element.
The utility model completely abandons the traditional electromagnetic driving mode, and adopts a brand-new piezoelectric driving mode to realize the movement of the lens in three directions, thereby realizing the Automatic Focusing (AF) function along the optical axis direction and the optical anti-shake (namely OIS) function along the movement of the first direction and the second direction which are vertical to the optical axis direction, and having reliable performance, high stability, extremely high commercial utilization value and wide commercial application scene.
Drawings
Fig. 1 is an exploded perspective view of a lens driving apparatus according to an embodiment of the present invention.
Fig. 2 is a perspective view of the lens driving apparatus of fig. 1, with a housing removed.
Fig. 3 is a perspective view of the lens driving apparatus of fig. 1 in which a first carrier and a second carrier are assembled together.
Fig. 4 is a perspective view of a mount of the lens driving apparatus of fig. 1 in which a second carrier and a third carrier are assembled together.
Fig. 5 is a perspective view of a base of the lens driving apparatus of fig. 1.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the utility model can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.
Fig. 1 is an exploded perspective view of a lens driving apparatus 100 according to an embodiment of the present invention. As shown in fig. 1, the lens driving apparatus 100 includes a base 10, a first carrier 20, a second carrier 30, a third carrier 40, a first piezoelectric driving mechanism 50, a second piezoelectric driving mechanism 60, and a third piezoelectric driving mechanism 70, which are independent of each other. Independent of one another means that any two or more of the base 10, the first carrier 20, the second carrier 30, the third carrier 40, the first piezoelectric driving mechanism 50, the second piezoelectric driving mechanism 60, and the third piezoelectric driving mechanism 70 are not integral structures, but are independently movable and separately manufactured components. The first carrier 20 is disposed on the base 10, the second carrier 30 is disposed on the first carrier 10, and the third carrier 40 is disposed in the second carrier 30. The first piezoelectric driving mechanism 50 and the second piezoelectric driving mechanism 60 are used for driving the first carrier 20 and the second carrier 30 to move in a first direction and a second direction perpendicular to each other on a plane perpendicular to the optical axis, respectively, and the third piezoelectric driving mechanism 40 is used for driving the third carrier 40 to move in the optical axis direction.
It should be noted that the present invention utilizes three piezoelectric driving mechanisms, namely, the first piezoelectric driving mechanism 50, the second piezoelectric driving mechanism 60 and the third piezoelectric driving mechanism 70 to independently drive the three carriers (namely, the first carrier 20, the second carrier 30 and the third carrier 40) to independently move, so as to ensure the respective maximum movement ranges, and facilitate the manufacturing and processing, and at the same time, the present invention completely abandons the conventional electromagnetic driving manner, and adopts a brand new piezoelectric driving manner to realize the movement of the lens in three directions, thereby realizing the auto-focusing (AF) function along the optical axis direction, and realizing the optical anti-shake (i.e., OIS) function along the movement in the first direction and the second direction perpendicular to the optical axis direction. Has extremely high commercial utilization value and wide commercial application scenes.
It should be noted that the optical axis direction of the present invention refers to the optical axis direction along the lens, i.e., the propagation direction of light in the lens. The lens of the present invention is mainly installed in the third carrier 40, and the third piezoelectric driving mechanism 70 also directly drives the third carrier 40 to move along the optical axis direction to realize optical zooming. The optical anti-shake function is realized by driving the third carrier to move in a first direction and a second direction perpendicular to the optical axis through the first carrier and the second carrier.
That is, optionally, the lens driving device of the present invention is configured such that when the first carrier 20 moves along the first direction, the first carrier 20, the second carrier 30 and the third carrier 40 are fixed relatively, so that the second carrier 30 and the third carrier 40 can be driven by the movement of the first carrier 20 to drive the lens to move along the first direction, and when the second carrier 30 moves along the second direction, the second carrier 30 and the third carrier 40 are fixed relatively, so that the third carrier 40 is driven by the movement of the second carrier 30 to move and further drive the lens installed in the third carrier 40 to move, so as to implement the optical zoom function, and when the third carrier 40 moves along the optical axis direction, the base 10, the first carrier 20 and the second carrier 30 are fixed relatively, so that the third carrier 40 moves along the optical axis direction in the second carrier 30 to implement the zoom function.
It is noted that optionally the first carrier 20 of the present invention has a first height h1The second carrier 30 has a second height h2The third carrier 40 has a third height h3Wherein the first height h1A second height h2And a third height h3There are two cases: first, h3 < h1, and the moving stroke h of the third carrier 40 satisfies the following relationship: h ≦ h1-h 3. Secondly, h3 < h2, and the motion stroke h of the third carrier satisfies the following relation: h ≦ h2-h 3. That is, the movement range of the third carrier 40 in the optical axis direction does not exceed the height of the first carrier 20 or the second carrier 30, thereby preventing the third carrier from colliding with a housing or the like when moving in the optical axis direction.
Referring to fig. 2 to 4, the first piezoelectric driving mechanism 50, the second piezoelectric driving mechanism 60, and the third piezoelectric driving mechanism 70 of an embodiment of the present invention will be described in detail, it should be noted that the first piezoelectric driving mechanism 50, the second piezoelectric driving mechanism 60, and the third piezoelectric driving mechanism 70 described below may be the same structure as the first piezoelectric driving mechanism 50, or the second piezoelectric driving mechanism 60, or the third piezoelectric driving mechanism 70, or any two of the first piezoelectric driving mechanism 50, the second piezoelectric driving mechanism 60, and the third piezoelectric driving mechanism 70, such as the first piezoelectric driving mechanism 50 and the second piezoelectric driving mechanism 60, and the third piezoelectric driving mechanism 70, or the first piezoelectric driving mechanism 50 and the third piezoelectric driving mechanism 70 The structure described below is employed.
As shown in fig. 2 to 4, the first piezoelectric driving mechanism 50 includes a first mass 51, a first piezoelectric element 52, a first friction member 53, and a first clamping member 54. A first mass 51 and a first piezoelectric element 52 are mounted on the base 10, a first clamp 54 is fixedly mounted on the first carrier 20 and is in frictional engagement with the first friction member 53, the first friction member 53 is disposed within the first clamp 54 and is engaged at an end with the first piezoelectric element 52 to drive the first carrier 20 to move when the first piezoelectric element 52 is energized, and the first mass 51 is disposed behind the first piezoelectric element 54 and restricts the first piezoelectric element 54 from moving in a direction opposite to the first direction. The first piezoelectric element 52 may be made of piezoelectric ceramics, for example, and may vibrate at high frequency when energized to drive the first friction member 53 to vibrate at high frequency, and drive the first clamping member 54 and thus the first carrier 20 to move through the cooperation of the first friction member 53 and the first clamping member 54. Optionally, a first baffle 55 is further disposed on the base 10, and the first baffle 55 forms a semi-enclosure structure to enclose and shield the first mass 51 and the first piezoelectric element 52.
The second piezoelectric driving mechanism 60 includes a second mass 61, a second piezoelectric element 62, a second friction member 63, and a second clamping member 64. The second mass 61 and the second piezoelectric element 62 are mounted on the first carrier 20, the second clamp 64 is fixedly mounted on the second carrier 30, and the second friction member 63 is arranged inside the second clamp 64 and cooperates at the end with the second piezoelectric element 62 to drive the second carrier 30 in motion when the second piezoelectric element 62 is energized. The second piezoelectric element 62 may be made of piezoelectric ceramics, for example, and may vibrate at high frequency when energized to drive the second friction member 63 to vibrate at high frequency, and drive the second clamping member 64 and thus the second carrier 30 to move through the cooperation of the second friction member 63 and the second clamping member 64. Optionally, a second baffle 65 is further disposed on the first carrier 20, and the second baffle 65 forms a semi-surrounding structure to surround and shield the second mass block 61 and the second piezoelectric element 62.
The third piezoelectric driving mechanism 70 includes a third mass 71, a third piezoelectric element 72, a third friction member 73 and a third clamping member 74, the third mass 71 and the third piezoelectric element 72 are mounted on the base 10, the third clamping member 74 is fixedly mounted on the third carrier 40, the third friction member 73 is disposed in the third clamping member 74 and cooperates with the third piezoelectric element 72 at an end portion to drive the third carrier 40 to move when the third piezoelectric element 72 is energized. The third piezoelectric element 72 may be made of piezoelectric ceramics, for example, and may vibrate at high frequency when energized, so as to drive the third friction member 73 to vibrate at high frequency, and drive the third clamping member 74 and thus the third carrier 40 to move through the cooperation between the third friction member 73 and the third clamping member 74. Optionally, a third baffle 75 is further disposed on the first base 10, and the third baffle 75 forms a semi-enclosed structure to enclose and shield the third mass 71 and the third piezoelectric element 72. Optionally, the third clamping member 74 is fixedly mounted on the third carrier 40 by a connecting plate 76.
With continued reference to fig. 2-4, optionally, the first carrier 20 is connected to the base 10 by a first guiding element 21, and the second carrier 30 is connected to the first carrier 20 by a second guiding element 31, for example, the first guiding element 21 may be a first wire guiding rod fixedly disposed on the base 10, and the first carrier 20 is provided with a first guiding groove 22 engaged with the first guiding rod. The first guide 21 is slidably installed in the first guide groove 22. The second guide member 31 may be a second guide bar fixedly disposed on the first carrier 20, and the second carrier 30 is provided with a second guide groove 32 engaged with the second guide member 31. The second guide member 31 is slidably installed in the second guide groove 32.
Alternatively, the first guide 21 and the first piezoelectric driving mechanism 50 on the first carrier 20 are respectively disposed at two opposite corners of the base 10, and the second piezoelectric driving mechanism 60 and the second guide 31 of the second carrier 30 are respectively disposed at two opposite corners of the first carrier 20. Thereby ensuring a smooth movement during the movement of the first carrier 20 in the first direction and a smooth movement of the second carrier 30 when moving in the second direction.
Referring to fig. 2, the second carrier 30 has a second cylindrical body 33, the third carrier 40 has a third cylindrical body 43, the third cylindrical body 43 is installed in the second cylindrical body 33, and the outer surface of the third cylindrical body 43 is engaged with the inner surface of the second cylindrical body 33 and guides the third carrier 40 when the third carrier 40 moves, and this arrangement can ensure stable movement of the third carrier 40 in the optical axis direction without using a third guide.
In one embodiment, the first direction, the second direction and the optical axis direction are respectively provided with a position sensor and a corresponding induction magnet to respectively detect the displacement of the first carrier, the second carrier and the third carrier in the first direction, the second direction and the optical axis direction. For example, referring to fig. 4, a position sensor 82 and an induction magnet 81 are provided along the optical axis direction, the position sensor 82 may be, for example, a hall sensor and is provided on the second carrier 30, and the induction magnet 81 is provided on the third carrier 40 and cooperates with the position sensor 82 to detect the position of the third carrier 40. Note that the induction magnet 81 may be disposed on the second carrier, and the position sensor 82 may be disposed on the third carrier 40. The arrangement in the first and second directions is similar and will not be described in detail.
Referring to fig. 5, in one embodiment, the lens driving device 100 may further include a first circuit board 91, a second circuit board 92, and a third circuit board 93, the first circuit board 91, the second circuit board 92, and the third circuit board 93 being respectively disposed at three sides of the lens driving device and respectively supplying power to the first piezoelectric element 52, the second piezoelectric element 62, and the third piezoelectric element 72. The first circuit board 91, the second circuit board 92, and the third circuit board 93 are preferably flexible circuit boards.
While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the utility model can be effected therein by those skilled in the art after reading the above teachings of the utility model. Such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (12)
1. A lens driving device is characterized in that the lens driving device comprises a base, a first carrier, a second carrier, a third carrier, a first piezoelectric driving mechanism, a second piezoelectric driving mechanism and a third piezoelectric driving mechanism which are mutually independent,
the first carrier is arranged on the base, the second carrier is arranged on the first carrier, the third carrier is arranged in the second carrier, and
the first piezoelectric driving mechanism and the second piezoelectric driving mechanism are respectively used for driving the first carrier and the second carrier to move along a first direction and a second direction which are perpendicular to each other on a plane perpendicular to an optical axis, and the third piezoelectric driving mechanism is used for driving the third carrier to move along the optical axis.
2. A lens driving device according to claim 1, wherein the lens driving device is configured to: when the first carrier moves along the first direction, the first carrier, the second carrier and the third carrier are relatively fixed; when the second carrier moves along the second direction, the second carrier and the third carrier are relatively fixed; and when the third carrier moves along the optical axis direction, the base, the first carrier and the second carrier are relatively fixed.
3. A lens driving apparatus according to claim 1, wherein the first carrier has a first height h1Said second support having a second height h2The third carrier has a third height h3Wherein the first height h1Second height h2And a third height h3Has the following relationship:
h3＜h1the movement stroke h of the third carrier satisfies the following relation: h is less than or equal to h1-h3(ii) a Or
h3＜h2The movement stroke h of the third carrier satisfies the following relation: h is less than or equal to h2-h3。
4. A lens driving device according to claim 1, wherein the first piezoelectric driving mechanism includes a first mass, a first piezoelectric element, a first friction member, and a first clamp member, the first mass and the first piezoelectric element being mounted on the base, the first clamp member being mounted on the first carrier and frictionally engaged with the first friction member, the first friction member being disposed within the first clamp member and end-engaged with the first piezoelectric element to drive the first carrier to move when the first piezoelectric element is energized.
5. A lens driving device according to claim 1, wherein the second piezoelectric driving mechanism includes a second mass, a second piezoelectric element, a second friction member, and a second clamp member, the second mass and the second piezoelectric element being mounted on the first carrier, the second clamp member being fixedly mounted on the second carrier, the second friction member being arranged in the second clamp member and cooperating with the second piezoelectric element at an end portion thereof to drive the second carrier to move when the second piezoelectric element is energized.
6. A lens driving device according to claim 1, wherein the third piezoelectric driving mechanism includes a third mass, a third piezoelectric element, a third friction member, and a third clamping member, the third mass and the third piezoelectric element being mounted on the base, the third clamping member being fixedly mounted on the third carrier, the third friction member being arranged in the third clamping member and cooperating with the third piezoelectric element at an end portion thereof to drive the third carrier to move when the third piezoelectric element is energized.
7. A lens driving apparatus according to claim 1, wherein the first carrier is connected to the base through a first guide, and the second carrier is connected to the first carrier through a second guide.
8. The lens driving apparatus according to claim 7, wherein the first guide member is a first guide bar fixedly disposed on the base, and the first carrier is provided with a first guide groove engaged with the first guide bar; and the second guide piece is a second guide rod, the second guide rod is fixedly arranged on the first carrier, and the second carrier is provided with a second guide groove matched with the second guide rod.
9. The lens driving device according to claim 8, wherein the first guide bar and the first piezoelectric driving mechanism on the first carrier are respectively provided at two opposite corners of the base, and the second piezoelectric driving mechanism and the second guide bar of the second carrier are respectively provided at two opposite corners of the first carrier.
10. The lens driving apparatus according to claim 1, wherein the second carrier has a second cylindrical body, the third carrier has a third cylindrical body, the third cylindrical body is mounted in the second cylindrical body and an outer surface of the third cylindrical body is engaged with the outer surface of the second cylindrical body and guides the third carrier when the third carrier moves.
11. A lens driving apparatus according to claim 1, wherein the first, second and optical axis directions are respectively provided with position sensors and corresponding induction magnets to respectively detect displacements of the first, second and third carriers in the first, second and optical axis directions.
12. The lens driving device according to claim 1, further comprising a first circuit board, a second circuit board, and a third circuit board which are respectively arranged at three sides of the lens driving device and respectively supply power to the first piezoelectric element, the second piezoelectric element, and the third piezoelectric element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121814754.2U CN215340502U (en) | 2021-08-04 | 2021-08-04 | Lens driving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121814754.2U CN215340502U (en) | 2021-08-04 | 2021-08-04 | Lens driving device |
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| CN215340502U true CN215340502U (en) | 2021-12-28 |
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| CN202121814754.2U Active CN215340502U (en) | 2021-08-04 | 2021-08-04 | Lens driving device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115079486A (en) * | 2022-06-25 | 2022-09-20 | Oppo广东移动通信有限公司 | Camera module and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115079486A (en) * | 2022-06-25 | 2022-09-20 | Oppo广东移动通信有限公司 | Camera module and electronic equipment |
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