Lens drive device and camera device for piezoelectric USM for autofocus

Abstract

The present disclosure provides a lens driving device of a piezoelectric USM for autofocus, comprising: a lens support portion for holding at least one camera lens; a piezoelectric USM portion, comprising a first piezoelectric USM portion and a second piezoelectric USM portion, the first piezoelectric USM portion and the second piezoelectric USM portion being used to move the lens support portion to a focal position of the lens in the optical axis direction of the lens; and a guide ball portion, comprising a plurality of guide ball members for receiving pressure from the first piezoelectric USM portion and the second piezoelectric USM portion, and maintaining smooth movement of the lens support portion in the optical axis direction, wherein the first piezoelectric USM portion and the second piezoelectric USM portion are respectively arranged near two corners of the lens support portion in the diagonal direction, the diagonal being located in a horizontal plane perpendicular to the optical axis direction and passing through the optical axis center point of the lens, and the guide ball portion is arranged at another corner of the lens support portion that is different from the two corners of the lens support portion. The present disclosure also provides a camera device.

Description

Technical Field

[0001] The present invention relates to a lens driving device of a piezoelectric USM for autofocus and a camera device. Background Art

[0002] At present, electronic devices such as mobile phones or personal mobile terminals are equipped with camera functions. In order to enable the camera to realize functions such as automatic zoom, optical zoom or optical image stabilization, it is necessary to use a lens driving device that can drive the lens. The lens driving device uses the driving force generated by the actuator to drive the lens, thereby changing the distance of the lens to realize functions such as zooming or focusing.

[0003] However, in the prior art, it is necessary to solve the problems of how to control and maintain the direction of the force applied to the lens support part, and also to solve the problems of how to provide sufficient force to the lens support part and correctly control the height and inclination of the lens. Summary of the invention

[0004] In order to solve at least one of the above technical problems, the present disclosure provides a lens driving device and a camera device.

[0005] According to one aspect of the present disclosure, a lens driving device of a piezoelectric USM for autofocus includes:

[0006] A lens support portion, the lens support portion being used to hold at least one imaging lens;

[0007] a piezoelectric USM portion, comprising a first piezoelectric USM portion and a second piezoelectric USM portion, wherein the first piezoelectric USM portion and the second piezoelectric USM portion are used to move the lens support portion to a focal position of the lens in an optical axis direction of the lens; and

[0008] a guide ball portion, comprising a plurality of guide ball members, the plurality of guide ball members being used to receive pressure from the first piezoelectric USM portion and the second piezoelectric USM portion and to maintain smooth movement of the lens support portion in the optical axis direction,

[0009] Among them, the first piezoelectric USM part and the second piezoelectric USM part are respectively arranged near the two corners of the lens support part in the diagonal direction, the diagonal is located in a horizontal plane perpendicular to the optical axis direction and passes through the center point of the optical axis of the lens, and the guide ball part is arranged at another corner of the lens support part different from the two corners of the lens support part.

[0010] According to at least one embodiment of the present disclosure, the force direction of the first piezoelectric USM portion and the second piezoelectric USM portion on the lens support portion is 45 degrees to the diagonal line and is toward the guide ball portion.

[0011] According to at least one embodiment of the present disclosure, the guide ball portion includes a first guide ball member, a second guide ball member and a third guide ball member.

[0012] The first guide ball member is located near the intersection of the force direction of the first piezoelectric USM part and the force direction of the second piezoelectric USM part, and

[0013] The second guide ball member is located near the first guide ball member in the force application direction of the first piezoelectric USM part, and the third guide ball member is located near the first guide ball member in the force application direction of the second piezoelectric USM part.

[0014] According to at least one embodiment of the present disclosure, a position detection device is further included, which includes a first position detection device and a second position detection device. The first piezoelectric USM part is controlled by a detection signal of the first position detection device, and the second piezoelectric USM part is controlled by a detection signal of the second position detection device, so that the lens support part moves to the focal position of the lens.

[0015] According to at least one embodiment of the present disclosure, the first position detection device is located near the first piezoelectric USM portion, and the second position detection device is located near the second piezoelectric USM portion.

[0016] According to at least one embodiment of the present disclosure, the first position detection device and the second position detection device respectively include a permanent magnet and a Hall sensor arranged opposite to the permanent magnet, and the permanent magnet is located on the side wall of the lens support portion.

[0017] According to at least one embodiment of the present disclosure, the device further includes a base, wherein the base includes a side wall portion extending toward the lens supporting portion.

[0018] A guide groove for accommodating the first guide ball member, the second guide ball member and the third guide ball member is provided on at least the side wall of the lens support portion, and the first guide ball member, the second guide ball member and the third guide ball member are respectively in contact with the guide groove and the side wall portion, so that when the lens support portion moves, the first guide ball member, the second guide ball member and the third guide ball member roll.

[0019] According to at least one embodiment of the present disclosure, the first guide ball component, the second guide ball component and the third guide ball component respectively include three balls, the three balls are arranged along the optical axis direction, and the diameter of the upper ball is the same as that of the lower ball, and is greater than or equal to the diameter of the middle ball.

[0020] According to at least one embodiment of the present disclosure, the distance between the center of the first guide ball member and the center line of the first piezoelectric USM part is 1.2 to 1.5 times the distance between the center of the first guide ball member and the center line of the first piezoelectric USM part, and the distance between the center of the first guide ball member and the center line of the second piezoelectric USM part is 1.2 to 1.5 times the distance between the center of the second guide ball member and the center line of the second piezoelectric USM part.

[0021] According to yet another aspect of the present disclosure, a camera device includes:

[0022] The lens driving device as described above;

[0023] at least one lens fixed in the lens support portion; and

[0024] An image sensor receives light passing through the at least one lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0026] Figure 1 It is a schematic exploded perspective view of a lens driving device according to an embodiment of the present disclosure.

[0027] Figure 2 It is a schematic exploded perspective view of a lens driving device according to an embodiment of the present disclosure.

[0028] Figure 3 is a cross-sectional view of a lens driving device according to an embodiment of the present disclosure.

[0029] Figure 4 is a schematic diagram of a piezoelectric actuator according to one embodiment of the present disclosure.

[0030] Figure 5 is based on Figure 3 A partial enlarged view of . DETAILED DESCRIPTION

[0031] The present disclosure is further described in detail below in conjunction with the accompanying drawings and implementations. It is understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure can be combined with each other. The technical solution of the present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as providing exemplary features of various details of some ways in which the technical concept of the present disclosure can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present disclosure.

[0034] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed in a different order than described. For example, two successively described processes can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0035] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0036] For descriptive purposes, the present disclosure may use spatially relative terms such as "under," "beneath," "under," "above," "upper," "above," "higher," and "side (e.g., as in "sidewall")," to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "under" or "beneath" other components or features would subsequently be positioned "above" the other components or features. Thus, the exemplary term "under" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0037] Ultrasonic Motor (USM) is a driver that uses mechanical vibration in the ultrasonic frequency domain as a driving source. The excitation element of the ultrasonic motor is piezoelectric ceramic, so it is also called a piezoelectric motor.

[0038] Figure 1 and 2 FIG. 1 shows an exploded perspective view of a lens driving device according to an embodiment of the present disclosure. Figure 1 and Figure 2 Exploded perspective views shown from different angles.

[0039] like Figure 1 As shown, the lens driving device 100 may include a housing 110 , a lens supporting portion 120 and a base 130 .

[0040] The base 130 may include a bottom 131 and a side wall 132. The side wall 132 may extend from the periphery of the bottom 131 to the side wall 132. Figure 1 Or extends in the upward direction shown in 2, thereby forming a space for accommodating the lens support part 120.

[0041] The lens support 120 is disposed in a space formed by the bottom 131 and the side wall 132 of the base 130 and has a hollow portion 121 in which at least one imaging lens is disposed. The lens support 120 can be moved at least in the optical axis direction of the lens by a driving force.

[0042] The housing 110 may cover the upper side of the lens support portion 120 and the outer peripheral wall of the side wall portion 132 .

[0043] Figure 3 A cross-sectional view of a lens driving device according to an embodiment of the present disclosure is shown. Figure 1-3The embodiments of the present disclosure are described in detail.

[0044] The lens driving device 100 may further include a piezoelectric USM portion 140 . The piezoelectric USM portion 140 may include a first piezoelectric USM portion 141 and a second piezoelectric USM portion 142 .

[0045] The first piezoelectric USM part 141 mainly includes a substrate 1411, a piezoelectric element 1412, and a silicone rubber 1413. The substrate 1411 may be a ceramic substrate, for example, may be supported by SiC or zirconia, etc. The substrate 1411 may be formed integrally with the lens support part 120. The silicone rubber 1413 may be provided on the side wall part 132 of the base 130.

[0046] The second piezoelectric USM part 142 mainly includes a substrate 1421, a piezoelectric element 1422, and a silicone rubber 1423. The substrate 1421 may be a ceramic substrate, for example, may be supported by SiC or zirconia, etc. The substrate 1421 may be formed integrally with the lens support part 120. The silicone rubber 1423 may be provided on the side wall part 132 of the base 130.

[0047] like Figure 4 As shown, the ceramic substrates 1411 and 1421 on the lens support part 120 can be pushed by the silicone rubber 1413 and 1423 behind the piezoelectric elements 1412 and 1422. The piezoelectric elements 1412 and 1422 can be divided into four regions. When the power is supplied in the power supply direction A, the upper and lower charge pumps 1414 and 1424 perform the actions shown by the two dashed arrows according to the displacement d31 (lateral displacement), thereby interacting with the ceramic substrate to move the lens support part 120 upward. When the power is supplied in the power supply direction B, the upper and lower charge pumps 1414 and 1424 perform the actions shown by the two dashed arrows, thereby interacting with the ceramic substrate to move the lens support part 120 downward.

[0048] The first piezoelectric USM portion 141 and the second piezoelectric USM portion 142 are used to move the lens support portion 120 to a focal position of the lens in the optical axis direction of the lens.

[0049] The lens driving device 100 may further include a guide ball portion 150 , which may include a plurality of guide ball members for receiving pressure from the first piezoelectric USM portion 141 and the second piezoelectric USM portion 142 and maintaining smooth movement of the lens support portion 120 in the optical axis direction G.

[0050] The first piezoelectric USM portion 141 and the second piezoelectric USM portion 142 are respectively arranged near the two corners of the lens support portion 120 in the direction of the diagonal line D, the diagonal line D is located in a horizontal plane perpendicular to the optical axis direction G and passes through the optical axis center point C of the lens, and the guide ball portion 150 is arranged at another corner of the lens support portion different from the two corners of the lens support portion (such as Figure 3 shown).

[0051] The force direction of the first piezoelectric USM portion 141 and the second piezoelectric USM portion 142 on the lens support portion 120 is 45 degrees to the diagonal line D and is directed toward the guide ball portion 150 .

[0052] Through the above configuration, the piezoelectric USM part can provide sufficient driving force (thrust) and can disperse the pressure applied to the lens support part, so that the lens support part can be prevented from tilting along the horizontal plane. And by setting two piezoelectric USM parts (90°) as above, the mutual vibration formed by the action of the two piezoelectric USM parts can be offset, thereby preventing unnecessary vibration of the lens support part and the lens.

[0053] By setting two piezoelectric USM parts in the above manner, the freedom of movement / rotation of each piezoelectric USM part can be limited. In this way, among the six degrees of freedom of X, Y, Z, θx, θy, θz, only the degree of freedom of the Z axis can be retained, and the other five degrees of freedom can be completely limited. In this way, it can be ensured that the lens support part and the lens only move in the direction of the optical axis, and do not move in other directions, so that tilting can be avoided.

[0054] The guide ball portion 150 includes a first guide ball member 1510, a second guide ball member 1520 and a third guide ball member 1530.

[0055] The first guide ball member 1510 is located near the intersection of the force direction L1 of the first piezoelectric USM part 141 and the force direction L2 of the second piezoelectric USM part 142. Figure 3 It is shown in the vicinity of the intersection position, but it can be set at the intersection.

[0056] The second guide ball member 1520 is located near the first guide ball member 1510 in the force direction L1 of the first piezoelectric USM part 141. Figure 3 As shown, the second guide ball member 1520 may be located at one side of the lens support portion 120 between the first piezoelectric USM portion 141 and the first guide ball member 1510 .

[0057] The third guide ball member 1530 is located near the first guide ball member 1510 in the force direction L2 of the second piezoelectric USM part 142. Figure 3 As shown, the third guide ball member 1530 may be located at one side of the lens support portion 120 between the second piezoelectric USM portion 142 and the first guide ball member 1510 .

[0058] At least a guide groove for accommodating the first guide ball member 1510, the second guide ball member 1520 and the third guide ball member 1530 is opened on the side wall of the lens support portion 120. The first guide ball member 1510, the second guide ball member 1520 and the third guide ball member 1530 are respectively in contact with the guide groove and the side wall portion, so that when the lens support portion 120 moves, the first guide ball member 1510, the second guide ball member 1520 and the third guide ball member 1530 roll.

[0059] like Figure 2 As shown, the first guide ball member 1510 may include three balls, the three balls are arranged along the optical axis direction, and the diameter of the upper ball is the same as that of the lower ball, and is greater than or equal to the diameter of the middle ball. The second guide ball member 1520 may include three balls, the three balls are arranged along the optical axis direction, and the diameter of the upper ball is the same as that of the lower ball, and is greater than or equal to the diameter of the middle ball. The third guide ball member 1530 may include three balls, the three balls are arranged along the optical axis direction, and the diameter of the upper ball is the same as that of the lower ball, and is greater than or equal to the diameter of the middle ball.

[0060] like Figure 3 As shown, the first guide ball member 1510 is a main ball member, while the second guide ball member 1520 and the third guide ball member 1530 are auxiliary ball members, and the second guide ball member 1520 and the third guide ball member 1530 are arranged at 90° relative to the first guide ball member 1510.

[0061] According to the above method, the first guide ball member is arranged at the corner of the lens support part, so that the optical axis deviation caused by the movement of the lens support part in the optical axis direction can be minimized. In addition, by adding two sets of auxiliary ball members, the contact and pressure between the driving part of the piezoelectric USM part, that is, the convex part arranged on the piezoelectric element and the ceramic plate arranged on the driving surface of the lens support part are uniformized, so that the driving force of the piezoelectric USM device can be accurately transmitted to the lens support part.

[0062] Figure 5 Shows Figure 3The distance d3 between the center of the first guide ball member 1510 and the center line LC1 of the first piezoelectric USM part 141 (the extension line passing through the center position of the first piezoelectric USM part 141) is 1.2 to 1.5 times the distance d4 between the third guide ball member 1530 and the center line LC1 of the first piezoelectric USM part. The distance d1 between the center of the first guide ball member 1510 and the center line LC2 of the second piezoelectric USM part 142 is 1.2 to 1.5 times the distance d2 between the second guide ball member 1520 and the center line LC2 of the second piezoelectric USM part 142. For example, when d1 and d3 can be 0.9, d2 and d4 can be 0.7.

[0063] By setting the above distance, it is possible to prevent the force applied by the piezoelectric USM portion from being concentrated on the first guide ball member, and by setting the above distance, the force can be dispersed through the two auxiliary ball members.

[0064] According to a further embodiment of the present disclosure, the lens driving device 100 may further include a position detection device 160, which includes a first position detection device 161 and a second position detection device 162. The first piezoelectric USM portion 141 is controlled by a detection signal of the first position detection device 161, and the second piezoelectric USM portion 142 is controlled by a detection signal of the second position detection device 162, so that the lens support portion 120 moves to the focal position of the lens.

[0065] In a preferred embodiment of the present disclosure, the first position detection device 161 is located near the first piezoelectric USM portion 141 , and the second position detection device 162 is located near the second piezoelectric USM portion 142 .

[0066] The first position detection device 161 includes a permanent magnet 1611 and a Hall sensor 1612 disposed opposite to the permanent magnet. The permanent magnet 1611 is located on the side wall of the lens support portion 120 .

[0067] The second position detection device 162 includes a permanent magnet 1621 and a Hall sensor 1622 disposed opposite to the permanent magnet. The permanent magnet 1621 is located on the side wall of the lens support portion 120 .

[0068] The two piezoelectric USM units are controlled by two position detection devices respectively. When the positions (heights) of the lens support units corresponding to the two piezoelectric USM units are detected to be different by the two position detection devices, the control of the piezoelectric USM units can be adjusted according to the detection signals. This prevents deviation in the optical axis direction. This minimizes the tilt of the lens support unit and the lens in the optical axis direction, thereby improving the movement tilt.

[0069] According to the present disclosure, the Hall sensor and the piezoelectric element are connected to an external circuit through the flexible circuit board 170, thereby achieving control of the piezoelectric USM part.

[0070] The specific control of the piezoelectric element and the connection between the flexible circuit board and the external circuit are common technical means in this field and will not be described in detail in this disclosure.

[0071] In summary, according to the embodiments of the present disclosure, a larger driving force can be provided by the piezoelectric USM unit, and the position can be detected in real time by using a position detection device arranged near the piezoelectric USM unit to control the piezoelectric USM unit, so that the height and inclination of all lenses can be accurately controlled.

[0072] According to another embodiment of the present disclosure, a camera device is provided, which includes the above-mentioned lens driving device; at least one lens fixed in the lens support part; and an image sensor that receives light passing through the at least one lens.

[0073] According to yet another embodiment of the present disclosure, an electronic device is provided, which may include the camera device described above.

[0074] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0075] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0076] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

[0077] Description of Reference Numerals

[0078] 100 Lens drive device

[0079] 110 Housing

[0080] 120 lens support part

[0081] 121 Hollow

[0082] 130 Base

[0083] 131 bottom

[0084] 132 Side wall

[0085] 140 Piezoelectric USM unit

[0086] 141 First Piezoelectric USM Unit

[0087] 142 Second Piezoelectric USM Unit

[0088] 150 Guide ball part

[0089] 160 Position detection device

[0090] 161 first position detection device

[0091] 162 second position detection device

[0092] 170 Flexible Circuit Board

[0093] 1411 base plate

[0094] 1412 Piezoelectric Components

[0095] 1413 Silicone Rubber

[0096] 1414 Charge Pump

[0097] 1421 base plate

[0098] 1422 Piezoelectric Components

[0099] 1423 Silicone Rubber

[0100] 1424 Charge Pump

[0101] 1510 First guide ball component

[0102] 1520 Second guide ball component

[0103] 1530 Third guide ball component

[0104] 1611 permanent magnet

[0105] 1612 Hall Sensor

[0106] 1621 permanent magnet

[0107] 1622 Hall sensor.

Claims

1. A lens driving device for a piezoelectric USM for autofocus, characterized in that: include: A lens support portion, the lens support portion being used to hold at least one imaging lens; A piezoelectric USM portion, comprising a first piezoelectric USM portion and a second piezoelectric USM portion, wherein the first piezoelectric USM portion and the second piezoelectric USM portion are used to move the lens support portion to a focal position of the lens in the optical axis direction of the lens; as well as a guide ball portion, comprising a plurality of guide ball members, the plurality of guide ball members being used to receive pressure from the first piezoelectric USM portion and the second piezoelectric USM portion and to maintain smooth movement of the lens support portion in the optical axis direction, The first piezoelectric USM part and the second piezoelectric USM part are respectively arranged near two corners of the lens support part in the diagonal direction, the diagonal is located in a horizontal plane perpendicular to the optical axis direction and passes through the optical axis center point of the lens, and the guide ball part is arranged at another corner of the lens support part different from the two corners of the lens support part. The force direction of the first piezoelectric USM part and the second piezoelectric USM part on the lens support part is 45 degrees to the diagonal line and is toward the guide ball part, and the first piezoelectric USM part and the second piezoelectric USM part are arranged at 90 degrees. The guide ball portion includes a first guide ball component, a second guide ball component and a third guide ball component. The first guide ball component is located near the intersection of the force direction of the first piezoelectric USM portion and the force direction of the second piezoelectric USM portion, and the second guide ball component is located near the first guide ball component in the force direction of the first piezoelectric USM portion, and the third guide ball component is located near the first guide ball component in the force direction of the second piezoelectric USM portion. The second guide ball component and the third guide ball component are arranged at 90° relative to the first guide ball component.

2. The lens driving device according to claim 1, wherein: It also includes a position detection device, which includes a first position detection device and a second position detection device. The first piezoelectric USM part is controlled by a detection signal of the first position detection device, and the second piezoelectric USM part is controlled by a detection signal of the second position detection device, so that the lens support part moves to the focal position of the lens.

3. The lens driving device according to claim 2, wherein: The first position detection device is located near the first piezoelectric USM portion, and the second position detection device is located near the second piezoelectric USM portion.

4. The lens driving device according to claim 2 or 3, characterized in that: The first position detection device and the second position detection device respectively include a permanent magnet and a Hall sensor arranged opposite to the permanent magnet, and the permanent magnet is located on the side wall of the lens support part.

5. The lens driving device according to claim 1, wherein: Also included is a base, the base including a side wall portion extending toward the lens supporting portion, A guide groove for accommodating the first guide ball member, the second guide ball member and the third guide ball member is provided on at least the side wall of the lens support portion, and the first guide ball member, the second guide ball member and the third guide ball member are respectively in contact with the guide groove and the side wall portion, so that when the lens support portion moves, the first guide ball member, the second guide ball member and the third guide ball member roll.

6. The lens driving device according to claim 5, characterized in that: The first guide ball component, the second guide ball component and the third guide ball component respectively include three balls, the three balls are arranged along the optical axis direction, and the diameters of the upper ball and the lower ball are the same and greater than or equal to the diameter of the middle ball.

7. The lens driving device according to claim 1, wherein: The distance between the center of the first guide ball member and the center line of the first piezoelectric USM part is 1.2 to 1.5 times the distance between the center of the third guide ball member and the center line of the first piezoelectric USM part, and the distance between the center of the first guide ball member and the center line of the second piezoelectric USM part is 1.2 to 1.5 times the distance between the center of the second guide ball member and the center line of the second piezoelectric USM part.

8. A camera device, characterized in that: include: The lens driving device according to any one of claims 1 to 7; at least one lens fixed in the lens support; as well as An image sensor receives light passing through the at least one lens.

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