Optical Element Driving Mechanism

Abstract

An optical element driving mechanism has an optical axis and includes a fixed part, a movable part, and a driving component. The movable part moves relative to the fixed part. The driving component drives the movable part to move relative to the fixed part. Among them, the driving component moves along a first direction, causing the movable part to move along a second direction, and the first direction is different from the second direction.

Description

Technical Field

[0001] The present disclosure relates to a driving mechanism, and particularly to an optical element driving mechanism. Background Art

[0002] The design of current electronic devices is continuously trending towards miniaturization, making it necessary to continuously reduce the size of various components or their structures of optical modules such as cameras in order to achieve the purpose of miniaturization. In view of this, how to design a miniaturized driving mechanism has become an important issue. Summary of the Invention

[0003] An embodiment of the present invention provides an optical element driving mechanism having an optical axis, including a fixed part, a movable part, and a driving component. The movable part moves relative to the fixed part. The driving component drives the movable part to move relative to the fixed part. Among them, the driving component moves along a first direction, causing the movable part to move along a second direction, and the first direction is different from the second direction.

[0004] In some embodiments, the driving component includes a piezoelectric element, a transmission element, a clamping element, a conversion element, two first magnetic elements, and a second magnetic element. The piezoelectric element has a disk shape extending along a third direction and a second direction. The transmission element is connected to the piezoelectric element. The clamping element is clamped to the transmission element and can move relative to the transmission element. The conversion element is connected to the clamping element. The two first magnetic elements are disposed on the conversion element, and the second magnetic element is disposed on the movable part. The first magnetic elements respectively have a first magnetic pole direction, and the first magnetic pole direction is neither parallel nor perpendicular to the first direction, the second direction, and the third direction. The second magnetic element has a second magnetic pole direction, and the second magnetic pole direction is parallel to the second direction. When viewed along the third direction, the first magnetic elements do not overlap, and one of the first magnetic elements is closer to the piezoelectric element than the other first magnetic element, and one of the first magnetic elements is closer to the light incident surface than the other first magnetic element, and the second magnetic element is between the first magnetic elements. When viewed along the first direction, the first magnetic elements partially overlap. When viewed along the second direction, the first magnetic elements do not overlap. Among them, the piezoelectric element causes the transmission element to move along the first direction, and the transmission element further causes the clamping element and the conversion element to move along the first direction, and through the interaction force between the first magnetic element and the second magnetic element, the movable part moves along the second direction.

[0005] In some embodiments, when viewed along the third direction, the second magnetic element at least partially overlaps any one of the first magnetic elements.

[0006] In some embodiments, when viewed along the third direction, the second magnetic element does not overlap any one of the first magnetic elements.

[0007] In some embodiments, the driving assembly further includes four intermediate elements, a contact conversion element, and a fixing portion. The fixing portion has a first sliding surface of the fixing portion and a second sliding surface of the fixing portion. The conversion element has a first sliding surface of the conversion element and a second sliding surface of the conversion element. The first sliding surface of the conversion element faces the first sliding surface of the fixing portion, and the first sliding surface of the fixing portion and the first sliding surface of the conversion element are perpendicular to the second direction. The second sliding surface of the conversion element faces the second sliding surface of the fixing portion, and the second sliding surface of the conversion element and the second sliding surface of the fixing portion are perpendicular to the second direction. The first sliding surface of the fixing portion is closer to the light incident surface than the second sliding surface of the fixing portion and the first sliding surface of the conversion element, and the second sliding surface of the conversion element is closer to the light incident surface than the second sliding surface of the fixing portion. The first sliding surface of the fixing portion has a first slide rail of the fixing portion extending along the first direction. The first sliding surface of the conversion element has two first grooves. The two first grooves and the first slide rail of the fixing portion accommodate a part of two of the intermediate elements. The second sliding surface of the fixing portion has a second slide rail of the fixing portion extending along the first direction. The second slide rail of the fixing portion extends along a direction parallel to the first direction. The second sliding surface of the conversion element has two second grooves. The two second grooves and the second slide rail of the fixing portion accommodate a part of the other two of the intermediate elements. When viewed along the second direction, the first slide rail of the fixing portion and the second slide rail of the fixing portion at least partially overlap.

[0008] In some embodiments, when viewed along the third direction, the intermediate elements do not overlap, and when viewed along the first direction, the intermediate elements at least partially overlap, and when viewed along the second direction, the intermediate elements at least partially overlap.

[0009] In some embodiments, the fixing portion has a first limiting surface, and the movable portion has a second limiting surface. The first limiting surface and the second limiting surface are configured to limit the range of movement of the conversion element in the first direction.

[0010] In some embodiments, the optical element driving mechanism further includes a guiding element. The movable portion has a first sliding groove, and a coating is covered on the inner wall of the first sliding groove. The guiding element is fixedly disposed on the fixing portion and at least partially located in the first sliding groove of the movable portion to enable the movable portion to move along the guiding element. When viewed along the third direction, the guiding element and the conversion element at least partially overlap. The movable portion further has a second sliding groove, and at least one of the first sliding groove and the second sliding groove is either closed or non-closed. The movable portion has a top surface and a bottom surface, and the fixing portion has an inner top wall and an inner bottom wall. The top surface faces the inner top wall and the bottom surface faces the inner bottom wall. The top surface, the bottom surface, the inner top wall, and the inner bottom wall are perpendicular to the second direction. When viewed along the third direction, the first distance between the top surface and the inner top wall is less than the length of the guiding element in the second direction, and the second distance between the bottom surface and the inner bottom wall is less than the length of the guiding element in the second direction.

[0011] In some embodiments, the guiding element has a cylindrical structure and extends along the second direction.

[0012] In some embodiments, the guiding element has a spherical structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present disclosure can be clearly understood through the following detailed description in conjunction with the drawings. It should be emphasized that, in accordance with the standard practice in the industry, the various features are not drawn to scale and are for illustrative purposes only. In fact, for the sake of clarity, the dimensions of the various features may be arbitrarily enlarged or reduced.

[0014] Figure 1 FIG. is a perspective view of an optical element driving mechanism according to an embodiment of the present disclosure.

[0015] Figure 2 FIG. is an exploded view of an optical element driving mechanism according to an embodiment of the present disclosure.

[0016] Figure 3 FIG. is a schematic diagram of a partial structure of an optical element driving mechanism according to an embodiment of the present disclosure.

[0017] Figure 4 FIG. is along Figure 1 FIG. is a cross-sectional view of the optical element driving mechanism cut along the line A-A' in FIG.

[0018] Figure 5 FIG. is along Figure 1 FIG. is a cross-sectional view of the optical element driving mechanism cut along the line B-B' in FIG.

[0019] Figure 6 FIG. is along Figure 1 FIG. is a cross-sectional view of the optical element driving mechanism cut along the line C-C' in FIG.

[0020] Figure 7 FIG. is a top view of a partial structure of an optical element driving mechanism according to an embodiment of the present disclosure.

[0021] Figure 8 FIG. is along Figure 1 FIG. is a cross-sectional view of the optical element driving mechanism cut along the line D-D' in FIG.

[0022] Figure 9 FIG. is a schematic diagram of a partial structure of an optical element driving mechanism according to another embodiment of the present disclosure.

[0023] Figure 10 FIG. is a schematic diagram of a partial structure of an optical element driving mechanism according to another embodiment of the present disclosure.

[0024] Figure 11 FIG. is a schematic diagram of the force between the first magnetic element and the second magnetic element in different states.

[0025] Description of the reference numerals:

[0026] 1, 1’: Optical element driving mechanism

[0027] 100, 100’: Fixed part

[0028] 110: Top shell

[0029] 110A: Outer top wall

[0030] 110B: Side wall

[0031] 110C: Inner top wall

[0032] 111: Opening in the top shell

[0033] 120: Base

[0034] 120A: Outer bottom wall

[0035] 120B: Inner bottom wall

[0036] 120C: First limiting surface / side wall

[0037] 120D: Receiving part

[0038] 121: Opening in the base

[0039] 122: First sliding surface of the fixed part

[0040] 122A: First slide rail of the fixed part

[0041] 123: Second sliding surface of the fixed part

[0042] 123A: Second slide rail of the fixed part

[0043] 124: First connecting surface

[0044] 125: Second connecting surface

[0045] 200, 200’: Movable part / carrier

[0046] 208’: Slide groove

[0047] 210: Main body part

[0048] 211: Through hole

[0049] 212: Second limiting surface / side wall

[0050] 213: Top surface

[0051] 214: Bottom surface

[0052] 220: First slide groove part

[0053] 221: First chute

[0054] 221A: Inner wall

[0055] 222: Side wall of the first chute part

[0056] 230: Second chute part

[0057] 231: Second chute

[0058] 300: Driving component

[0059] 310: Piezoelectric element

[0060] 311: Piezoelectric ceramic plate

[0061] 312: Elastic material sheet

[0062] 320: Transmission element

[0063] 330: Clamping element

[0064] 340: Conversion element

[0065] 341: Side wall of the conversion element

[0066] 342: First sliding surface of the conversion element

[0067] 342A: First groove

[0068] 343: Second sliding surface of the conversion element

[0069] 343A: Second groove

[0070] 350: First magnetic element

[0071] 360: Second magnetic element

[0072] 370: Intermediary element

[0073] 400: Adhesive element

[0074] 500, 500’: Guide element

[0075] D1: First direction

[0076] D2: Second direction

[0077] D3: Third direction

[0078] M1: First magnetic pole direction

[0079] M2: Second magnetic pole direction

[0080] I: Incident surface of light

[0081] L: Length

[0082] O: Optical axis

[0083] R1: First distance

[0084] R2: Second distance

[0085] S: Housing

[0086] S1, S2, S3, S4, S5: States Detailed implementation manners

[0087] In order to make the objectives, features, and advantages of the present disclosure more obvious and understandable, specific embodiments are hereinafter given and detailed descriptions are made in conjunction with the accompanying drawings. Among them, the configurations of the components in the embodiments are for illustrative purposes and are not intended to limit the present disclosure. Also, some of the reference numerals in the embodiments are repeated. For the purpose of simplifying the description, this does not imply the relevance between different embodiments. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, or back, etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for illustration and not for limiting the present disclosure.

[0088] In addition, relative terms may be used in the embodiments, such as "lower" or "bottom" and "higher" or "top", to describe the relative relationship of one element of the drawing to another element. It can be understood that if the device shown in the drawing is turned upside down, the element described on the "lower" side will become the element on the "higher" side.

[0089] Herein, the terms "about" and "approximately" generally mean within 20% of a given value or range, preferably within 10%, and more preferably within 5%. The given quantity is an approximate quantity, meaning that the meaning of "about" and "approximately" can still be implied without specific description.

[0090] Please refer to Figure 1 and Figure 2 , Figure 1 is a perspective view of the optical element driving mechanism 1 according to an embodiment of the present disclosure. Some elements are shown as transparent in dashed lines to clearly show the configurations of the elements. Figure 2 is an exploded view of the optical element driving mechanism 1 according to an embodiment of the present disclosure. The optical element driving mechanism 1 has an optical axis O and includes a fixed portion 100, a movable portion 200, a driving assembly 300, and an adhesive element 400 (refer to Figure 6) and two guiding elements 500, wherein the driving assembly 300 moves along a first direction D1, causing the movable part 200 to move along a second direction D2. The first direction D1 is different from the second direction D2. In this embodiment, the first direction D1 is perpendicular to the second direction D2, and the second direction D2 is parallel to the optical axis O. In this embodiment, the optical element driving mechanism 1 has an Auto Focusing (AF) function, but is not limited thereto. In some embodiments, the optical element driving mechanism 1 may also have an Auto Focusing and Optical Image Stabilization (OIS) function.

[0091] The fixed part 100 is a housing S, including a top shell 110 and a base 120. The top shell 110 includes an outer top wall 110A, four side walls 110B, and an inner top wall 110C (as Figure 8 shown). The base 120 includes an outer bottom wall 120A, an inner bottom wall 120B, a first sliding surface 122 of the fixed part, a first slide rail 122A of the fixed part, a second sliding surface 123 of the fixed part, a second slide rail 123A of the fixed part, a first connection surface 124, and a second connection surface 125. The aforementioned top shell 110 has a hollow structure and can be combined with the base 120 to form the housing S of the optical element driving mechanism 1, wherein the top shell 110 forms the outer top wall 110A and the four side walls 110B of the housing S, and the base 120 forms the outer bottom wall 120A of the housing S. It should be understood that a top shell opening 111 and a base opening 121 are respectively formed on the top shell 110 and the base 120. The center of the top shell opening 111 corresponds to the optical axis O, and the base opening 121 corresponds to an image sensing element (not shown) disposed outside the optical element driving mechanism 1. External light can enter the top shell 110 through the top shell opening 111, and then pass through an optical element (not shown) and the base opening 121 and be received by the aforementioned image sensing element to generate a digital image signal.

[0092] The movable part 200 can be connected to the optical element and move relative to the fixed part 100. In some embodiments, the movable part 200 is a carrier 200, having a main body part 210 with a cylindrical shape and a first chute part 220 and a second chute part 230 extending from the main body part 210. The main body part 210 has a through hole 211, a side wall 212, a top surface 213, and a bottom surface 214. The first chute part 220 has a first chute 221, and the second chute part 230 has a second chute 231. Among them, a threaded structure for corresponding locking is arranged between the through hole 211 and the aforementioned optical element, so that the optical element can be locked in the through hole 211.

[0093] Please refer to Figure 2 and Figure 3 ,Figure 3 FIG. is a schematic view of a partial structure of an optical element driving mechanism 1 according to an embodiment of the present disclosure. The driving assembly 300 includes a piezoelectric element 310, a transmission element 320, a clamping element 330, a conversion element 340, two first magnetic elements 350, a second magnetic element 360, and four intermediate elements 370. Figure 3 The movable part 200 and the conversion element 340 in FIG. are shown as transparent in dashed lines to clearly show the configuration of each element.

[0094] In some embodiments, the piezoelectric element 310 has a disk shape extending along a third direction D3 and a second direction D2. The third direction D3 is perpendicular to the first direction D1, and the third direction D3 is perpendicular to the second direction D2. The piezoelectric element 310 includes two piezoelectric ceramic plates 311 and an elastic material sheet 312, and the elastic material sheet 312 is disposed between the two piezoelectric ceramic plates 311. The transmission element 320 is connected to the piezoelectric element 310. More specifically, the transmission element 320 is fixed to the center of the piezoelectric ceramic plate 311. The transmission element 320 is a long axis of a cylindrical shape, and the direction of the long axis is parallel to the first direction D1. The clamping element 330 is clamped to the transmission element 320. The clamping element 330 uses an elastic material and has an arc shape that matches the shape of the long axis (transmission element 320) such that the long axis can pass through the clamping element 330 and the clamping element 330 can clamp onto the long axis. The conversion element 340 is connected to the clamping element 330. More specifically, a part of the clamping element 330 is embedded in the conversion element 340, but is not limited thereto. In some embodiments, the conversion element 340 and the clamping element 330 are integrally formed.

[0095] Two first magnetic elements 350 are disposed on the conversion element 340. More specifically, the conversion element 340 has a conversion element sidewall 341, and two recesses are provided on the conversion element sidewall 341 to receive the two first magnetic elements 350. The two first magnetic elements 350 each have a first magnetic pole direction M1 that is neither parallel nor perpendicular to the first direction D1, the second direction D2, and the third direction D3. When viewed along the first direction D1, the two first magnetic elements 350 partially overlap, and when viewed along the second direction D2, the two first magnetic elements 350 do not overlap. When viewed along the third direction D3, the two first magnetic elements 350 do not overlap. One of the two first magnetic elements 350 is closer to the piezoelectric element 310 than the other, and one of the two first magnetic elements 350 is closer to an optical incident surface I than the other.

[0096] A second magnetic element 360 is disposed on the movable part 200. More specifically, as shown in Figure 3As shown, the first chute portion 220 has a first chute portion side wall 222. A recess is provided on the first chute portion side wall 222 to receive the second magnetic element 360, and the first chute portion side wall 222 faces the conversion element side wall 341 (the conversion element side wall 341 is as shown in Figure 2 ). The second magnetic element 360 has a second magnetic pole direction M2, and the second magnetic pole direction M2 is parallel to the second direction D2. When viewed along the third direction D3, the second magnetic element 360 is between the two first magnetic elements 350. In some embodiments, the second magnetic element 360 at least partially overlaps with any one of the two first magnetic elements 350, but is not limited thereto. In other embodiments, the second magnetic element 360 does not overlap with any one of the two first magnetic elements 350.

[0097] Please refer to Figure 2 、 Figures 4 to 6 , Figure 4 For the cross-sectional view of the optical element driving mechanism 1 cut along the line A-A' in Figure 1 . Figure 5 For the cross-sectional view of the optical element driving mechanism 1 cut along the line B-B' in Figure 1 . Figure 6 For the cross-sectional view of the optical element driving mechanism 1 cut along the line C-C' in Figure 1 . The conversion element 340 has a first conversion element sliding surface 342 and a second conversion element sliding surface 343. The first conversion element sliding surface 342 faces the first fixed portion sliding surface 122, and the first fixed portion sliding surface 122 and the first conversion element sliding surface 342 are perpendicular to the second direction D2. The second conversion element sliding surface 343 faces the second fixed portion sliding surface 123, and the second conversion element sliding surface 343 and the second fixed portion sliding surface 123 are perpendicular to the second direction D2.

[0098] As shown in Figure 2 、 Figure 4 and Figure 6As shown, the first sliding surface 122 of the fixing part is closer to the light incident surface I than the second sliding surface 123 of the fixing part and the first sliding surface 342 of the conversion element. The first sliding surface 122 of the fixing part has a first slide rail 122A of the fixing part extending along the first direction D1. The first sliding surface 342 of the conversion element has two first grooves 342A. The two first grooves 342A accommodate two intermediate elements 370. One first groove 342A and the first slide rail 122A of the fixing part accommodate a part of one intermediate element 370. In other words, the intermediate element 370 contacts the conversion element 340 and the fixing part 100. The intermediate element 370 is movably disposed between the first groove 342A and the first slide rail 122A of the fixing part. The first groove 342A limits the movement range of the intermediate element 370. And by disposing the intermediate element 370 in the first slide rail 122A of the fixing part, the friction between the first sliding surface 342 of the conversion element and the first sliding surface 122 of the fixing part can be reduced.

[0099] As Figure 2 , Figure 5 and Figure 6 shown, the second sliding surface 343 of the conversion element is closer to the light incident surface I than the second sliding surface 123 of the fixing part. Similar to the first sliding surface 342 of the conversion element and the first sliding surface 122 of the fixing part described above, the second sliding surface 343 of the conversion element has two second grooves 343A. The second sliding surface 123 of the fixing part has a second slide rail 123A of the fixing part extending along the first direction D1. The two second grooves 343A accommodate two intermediate elements 370. One second groove 343A and the second slide rail 123A of the fixing part accommodate a part of one intermediate element 370. That is, the intermediate element 370 is movably disposed between the second groove 343A and the second slide rail 123A of the fixing part. The second groove 343A limits the movement range of the intermediate element 370. And by disposing the intermediate element 370 in the second slide rail 123A of the fixing part, the friction between the second sliding surface 343 of the conversion element and the second sliding surface 123 of the fixing part can be reduced.

[0100] When observed along the second direction D2, the first slide rail 122A of the fixing part and the second slide rail 123A of the fixing part at least partially overlap. When observed along the third direction D3, the intermediate elements 370 do not overlap. And when observed along the first direction D1, the intermediate elements 370 at least partially overlap. And when observed along the second direction D2, the intermediate elements 370 at least partially overlap.

[0101] In this embodiment, two intermediate elements 370 are disposed on one side of the conversion element 340 close to the light incident surface I, and another two intermediate elements 370 are disposed on the opposite side of the conversion element 340 away from the light incident surface I. When the intermediate elements 370 move in the slide rail, compared with only one intermediate element 370 disposed on each side or only one side having an intermediate element 370, they can move more stably. However, this is not limited thereto, and the number or configuration of the intermediate elements 370 can be adjusted according to requirements. In some embodiments, the intermediate elements 370 are fixedly disposed on the conversion element 340. In some embodiments, the intermediate elements 370 may not be provided, and instead, the friction is reduced by changing the material between the two sliding surfaces.

[0102] Please refer to Figure 6 and Figure 7 , Figure 7 FIG. is a top view of a partial structure of the optical element driving mechanism 1 according to an embodiment of the present disclosure. The driving assembly 300 can be connected to the fixing portion 100 by using the bonding element 400. More specifically, the base 120 has a first connection surface 124 perpendicular to the first direction D1, and this first connection surface 124 faces the piezoelectric ceramic plate 311 of the piezoelectric element 310, and the bonding element 400 can be disposed between the piezoelectric ceramic plate 311 and the first connection surface 124. When viewed along the second direction D2, the first connection surface 124 and the transmission element 320 at least partially overlap.

[0103] The base 120 also has a second connection surface 125 perpendicular to the second direction D2. This second connection surface 125 faces the transmission element 320, and the bonding element 400 can be disposed between the transmission element 320 and the second connection surface 125. When viewed along the second direction D2, the second connection surface 125 and the transmission element 320 at least partially overlap. In this embodiment, the bonding element 400 is a flexible adhesive that connects the driving assembly 300 to the fixing portion 100, so that the piezoelectric element 310 and the transmission element 320 can move relative to the base 120 along the first direction D1 within a specific range.

[0104] Please refer to Figures 7 to 9 , Figure 8 is along Figure 1 The cross-sectional view of the optical element driving mechanism 1 cut along the D-D' line segment in Figure 9 FIG. is a schematic diagram of a partial structure of the optical element driving mechanism 1' according to another embodiment of the present disclosure. As Figure 7As shown, two cylindrical guiding elements 500 are fixedly disposed on the base 120 of the fixed portion 100 and respectively pass through the first sliding groove 221 and the second sliding groove 231 of the movable portion 200. A coating is covered on an inner wall 221A of the first sliding groove 221 to reduce the frictional force between the guiding element 500 and the first sliding groove 221. In this embodiment, the optical element driving mechanism 1 has a rectangular structure. When observed along the second direction D2, the first sliding groove 221 and the second sliding groove 231 are diagonally disposed, and the first sliding groove 221 is disposed at a corner close to the conversion element 340. When observed along the third direction D3, the first sliding groove 221 and the conversion element 340 at least partially overlap.

[0105] In some embodiments, the first sliding groove 221 is closed, that is, as Figure 7 shown, the first sliding groove 221 surrounds the guiding element 500. On the other hand, the second sliding groove 231 is non-closed. As Figure 7 shown, the guiding element 500 is not completely surrounded by the second sliding groove 231. Since the first sliding groove 221 is closed, a receiving portion 120D is provided on a side wall 120C of the base 120 to receive the protruding portion that surrounds the first sliding groove 221 and is close to the side wall 120C of the base 120. Through such a design structure, the space inside the optical element driving mechanism 1 can be fully utilized to achieve miniaturization. And compared with the structure having only one closed sliding groove, the closed first sliding groove 221 can enable the movable portion 200 to move along the sliding groove, while the non-closed second sliding groove 231 can assist the movement of the movable portion 200 in the second direction D2. In addition, compared with the structure having two closed sliding grooves, the non-closed second sliding groove 231 can reduce the probability that the guiding element 500 cannot pass through the sliding groove during assembly due to manufacturing tolerances, and thus can improve the assembly success rate of the optical element driving mechanism 1.

[0106] As Figure 8 shown, the top surface 205 of the movable portion 200 faces the inner top wall 110C of the top shell 110, and the bottom surface 206 of the movable portion 200 faces the inner bottom wall 120B of the base 120. The top surface 205, the bottom surface 206, the inner top wall 110C, and the inner bottom wall 120B are perpendicular to the second direction D2. When observed along the third direction D3, a first distance R1 between the top surface 205 and the inner top wall 110C is less than a length L of the guiding element 500 in the second direction D2, and a second distance R2 between the bottom surface 206 and the inner bottom wall 120B is less than the length L of the guiding element 500 in the second direction D2. That is to say, since the guiding element 500 is long enough, even when the movable portion 200 reaches the maximum movement range, it will not disengage from the guiding element 500.

[0107] However, the guiding element 500 and the sliding groove are not limited to the above structures, and the configurations and quantities of the guiding element 500 and the sliding groove can be changed according to requirements. For example, as Figure 9 shown, in some other embodiments, an optical element driving mechanism 1' has a structure and components similar to those of the optical driving mechanism 1. Among them, the guiding element 500' is a spherical structure fixed to both sides of the fixing portion 100'. The movable portion 200' has a sliding groove 208', and at least a part of the guiding element 500' is located in the sliding groove 208', which can prevent the occurrence of deviation when the movable portion 200' moves in the second direction D2.

[0108] In some embodiments, the optical element driving mechanism 1 further includes a position sensing component (not shown) for sensing the relative movement between the fixing portion 100 and the movable portion 200. At least a part of the position sensing component is disposed on the movable portion 200, and at least another part of the position sensing component is disposed on the fixing portion 100. For example, the position sensing component may include a sensing element and a sensing magnetic element. The sensing element is disposed on the base 120 of the fixing portion 100, and the sensing magnetic element is disposed on the movable portion 200. More specifically, the sensing element may be, for example, a Hall effect sensor, a magnetoresistive sensor (MR sensor), or a fluxgate, configured to sense the magnetic field of the sensing magnetic element on the carrier 200, thereby obtaining the position of the carrier 200 relative to the base 120, but not limited thereto. For example, in some embodiments, the second magnetic element 360 may also serve as the sensing magnetic element.

[0109] Next, refer to Figure 2 、 Figure 6 、 Figure 10 and Figure 11 to illustrate the operation of the optical element driving mechanism 1. Figure 10 is a schematic diagram of a part of the structure of the optical element driving mechanism 1, where the conversion element 340 is shown as transparent in dashed lines to clearly illustrate the configuration of each element. Figure 11 is a schematic diagram of the force between the first magnetic element 350 and the second magnetic element 360 in different states. When a voltage is applied to the driving assembly 300, the disc-shaped piezoelectric element 310 deforms, for example, bends slowly outward (the center of the piezoelectric element 310 is closer to the first connection surface 124 than the outer circumference. The first connection surface 124 is as Figure 6As shown, the transmission element 320 is thus moved in the first direction D1 away from the piezoelectric element 310. At this time, since there is a static friction force between the transmission element 320 and the clamping element 330, there is no relative movement between the transmission element 320 and the clamping element 330. Then, the voltage is controlled again to cause the piezoelectric element 310 to bend inward quickly (the outer circumference of the piezoelectric element 310 is closer to the first connection surface 124 than the center). As a result, the transmission element 320 is quickly moved in the first direction D1 toward the piezoelectric element 310, overcoming the static friction force between the transmission element 320 and the clamping element 330. Thus, the clamping element 330 is moved in the first direction D1 away from the piezoelectric element 310 relative to the transmission element 320. Since the conversion element 340 is connected to the clamping element 330, by repeating the above steps, the movement of the conversion element 340 in the first direction D1 can be controlled.

[0110] When the first magnetic element 350 provided in the conversion element 340 moves in the first direction D1 along with the conversion element 340, the acting force between the first magnetic element 350 and the second magnetic element 360 also changes accordingly. As Figure 11 shown in the state S1, when the second magnetic element 360 is at approximately the center of the two first magnetic elements 350, the force is balanced at this time and the movable part 200 remains stationary. When the first magnetic element 350 moves in the first direction D1 away from the piezoelectric element 310, as shown in the state S2, the resultant force applied to the movable part 200 by the two first magnetic elements 350 and the second magnetic element 360 is downward, causing the movable part 200 to move in the second direction D2 along the guiding element 500 away from the light incident surface I.

[0111] However, when the first magnetic element 350 moves in the first direction D1 away from the piezoelectric element 310 to a first specific distance DS1, as shown in the state S3, the direction of the resultant force applied to the movable part 200 by the two first magnetic elements 350 and the second magnetic element 360 changes to upward, and the movable part 200 no longer moves downward. When the first magnetic element 350 moves in the first direction D1 toward the piezoelectric element 310 from the aforementioned first specific distance DS1, as shown in the state S4, the upward resultant force applied to the movable part 200 by the two first magnetic elements 350 and the second magnetic element 360 causes the movable part 200 to move in the second direction D2 along the guiding element 500 toward the light incident surface I.

[0112] When the first magnetic element 350 moves closer to the piezoelectric element 310 in the first direction D1 and reaches a second specific distance DS2, as shown in state S5, the direction of the resultant force applied to the movable part 200 between the two first magnetic elements 350 and the second magnetic element 360 changes to downward, and the movable part 200 no longer moves upward. Therefore, the movement of the movable part 200 in the second direction D2 can be controlled by controlling the movement of the driving assembly 300 in the first direction D1.

[0113] As can be seen from the above, by changing the distance between the first magnetic element 350 and the second magnetic element 360, the movement range of the movable part 200 can be restricted. Therefore, although the two first magnetic elements 350 in this embodiment are disposed on the conversion element 340 and the second magnetic element 360 is disposed on the movable part 200, it is not limited thereto. In addition, the arrangement direction of the magnetic elements can also be changed according to requirements.

[0114] As Figure 7 shown, the base 120 of the fixing part 100 has a side wall 120C as a first limiting surface 120C. The first limiting surface 120C is perpendicular to the first direction D1 and faces one side surface of the conversion element 340. When the side surface of the conversion element 340 contacts the first limiting surface 120C, the movement of the conversion element 340 stops, and the movement range of the conversion element 340 away from the piezoelectric element 310 in the first direction D1 is restricted. And through the cylindrical shape of the movable part 200, the side wall 202 of the movable part 200 is used as a second limiting surface 202. When the conversion element 340 contacts the second limiting surface 202, the movement stops, and the movement range of the conversion element 340 approaching the piezoelectric element 310 in the first direction D1 is restricted. That is to say, the first limiting surface 120C and the second limiting surface 202 are configured to restrict the movement range of the conversion element 340 in the first direction D1, and through the first limiting surface 120C and the second limiting surface 202, the movement range of the movable part 200 in the second direction D2 is also restricted.

[0115] In existing optical element drive mechanisms, the driving component and the movable part move in the same direction. That is, the long axis of the transmission element is set parallel to the optical axis. If one wants to increase the movement range of the movable part, the length of the transmission element must be increased. However, this makes the optical element drive mechanism thicker in the optical axis direction. In contrast to existing optical element drive mechanisms, in the present embodiment, since the transmission element 320 (long axis) is horizontally disposed within the optical element drive mechanism 1 (or is said to be disposed perpendicular to the optical axis O), and the piezoelectric element 310 and the conversion element 340 can be respectively disposed at two corners of the optical element drive mechanism 1 in cooperation with the rectangular fixed part 100 and the circular movable part 200, the transmission element 320 can be designed to be longer without affecting the overall thickness of the optical element drive mechanism 1, and the movable part 200 can thus have a larger movement range. In addition, the space between the carrier 200 and the base 120 can be fully utilized, and a more miniaturized optical element drive mechanism 1 can be provided.

[0116] As described above, an embodiment of the present invention provides an optical element drive mechanism, including a fixed part, a movable part, and a driving component. The movable part is movably disposed on the fixed part. The driving component is disposed on the fixed part and drives the movable part to move relative to the fixed part. Therefore, an optical element drive mechanism that is more miniaturized and can control the movement of the movable part in a second direction by controlling the movement of the driving component in a first direction is provided.

[0117] Although the embodiments of the present invention and their advantages have been disclosed as above, it should be understood that any person skilled in the art can make changes, substitutions, and modifications without departing from the concept and scope of the present invention. In addition, the protection scope of the present invention is not limited to the processes, machines, manufactures, compositions of matter, devices, methods, and steps in the specific embodiments described in the specification. Any person skilled in the art can understand the processes, machines, manufactures, compositions of matter, devices, methods, and steps developed currently or in the future from the disclosure of the present invention. As long as they can perform substantially the same functions or obtain substantially the same results in the embodiments described herein, they can be used according to the present invention. Therefore, the protection scope of the present invention includes the above-mentioned processes, machines, manufactures, compositions of matter, devices, methods, and steps. In addition, each claim constitutes an individual embodiment, and the protection scope of the present invention also includes the combination of each claim and embodiment.

Claims

1. An optical element driving mechanism having an optical axis, comprising: A fixed part; A movable part that moves relative to the fixed part; And A driving component that drives the movable part to move relative to the fixed part; Wherein the driving component moves along a first direction to cause the movable part to move along a second direction, and the first direction is different from the second direction. Wherein the driving component includes: A piezoelectric element having a disc shape extending along a third direction and the second direction; A transmission element connected to the piezoelectric element; A clamping element clamped to the transmission element and movable relative to the transmission element; A conversion element connected to the clamping element; Two first magnetic elements disposed on the conversion element; and A second magnetic element disposed on the movable part; Wherein the first magnetic elements each have a first magnetic pole direction that is neither parallel nor perpendicular to the first direction, the second direction, and the third direction.

2. The optical element driving mechanism according to claim 1, Wherein the second magnetic element has a second magnetic pole direction that is parallel to the second direction; Wherein when viewed along the third direction, the two first magnetic elements do not overlap, one of the two first magnetic elements is closer to the piezoelectric element than the other first magnetic element, one of the two first magnetic elements is closer to an incident surface of light than the other first magnetic element, and the second magnetic element is between the two first magnetic elements; Wherein when viewed along the first direction, the two first magnetic elements partially overlap; Wherein the transmission element is a long axis of a cylindrical shape, and the direction of the long axis is parallel to the first direction; Wherein when viewed along the second direction, the two first magnetic elements do not overlap; Wherein the piezoelectric element causes the transmission element to move along the first direction, and the transmission element in turn causes the clamping element and the conversion element to move along the first direction, and through the force between the two first magnetic elements and the second magnetic element, causes the movable part to move along the second direction.

3. The optical element driving mechanism according to claim 1, wherein when viewed along the third direction, the second magnetic element at least partially overlaps with any one of the two first magnetic elements.

4. The optical element driving mechanism according to claim 1, wherein when viewed along the third direction, the second magnetic element does not overlap with any one of the two first magnetic elements.

5. The optical element driving mechanism according to claim 1, wherein the driving component further includes four intermediate elements that contact the conversion element and the fixed part. The fixing part has a first sliding surface of the fixing part and a second sliding surface of the fixing part. The conversion element has a first sliding surface of the conversion element and a second sliding surface of the conversion element. The first sliding surface of the conversion element faces the first sliding surface of the fixing part, and the first sliding surface of the fixing part and the first sliding surface of the conversion element are perpendicular to the second direction. The second sliding surface of the conversion element faces the second sliding surface of the fixing part, and the second sliding surface of the conversion element and the second sliding surface of the fixing part are perpendicular to the second direction; The first sliding surface of the fixing part is closer to the light incident surface than the second sliding surface of the fixing part and the first sliding surface of the conversion element, and the second sliding surface of the conversion element is closer to the light incident surface than the second sliding surface of the fixing part; The first sliding surface of the fixing part has a first slide rail of the fixing part extending along the first direction. The first sliding surface of the conversion element has two first grooves. The two first grooves and the first slide rail of the fixing part accommodate a part of two of the four intermediate elements; The second sliding surface of the fixing part has a second slide rail of the fixing part extending along the first direction. The second slide rail of the fixing part extends along a direction parallel to the first direction. The second sliding surface of the conversion element has two second grooves. The two second grooves and the second slide rail of the fixing part accommodate a part of the other two of the four intermediate elements; When viewed along the second direction, the first slide rail of the fixing part and the second slide rail of the fixing part at least partially overlap.

6. The optical element driving mechanism according to claim 5, wherein when viewed along the third direction, the four intermediate elements do not overlap, and when viewed along the first direction, the four intermediate elements at least partially overlap, and when viewed along the second direction, the four intermediate elements at least partially overlap.

7. The optical element driving mechanism according to claim 1, wherein the fixing part has a first limiting surface, and the movable part has a second limiting surface. The first limiting surface and the second limiting surface are configured to limit a range of movement of the conversion element in the first direction.

8. The optical element driving mechanism according to claim 1, further comprising a guiding element. The movable part has a first sliding groove, and a coating covers an inner wall of the first sliding groove. The guiding element is fixedly arranged on the fixing part and at least partially located in the first sliding groove of the movable part, so that the movable part moves along the guiding element, wherein when viewed along the third direction, the guiding element and the conversion element at least partially overlap; wherein the movable part further has a second sliding groove, and at least one of the first sliding groove and the second sliding groove is one of a closed type and a non-closed type; The movable part has a top surface and a bottom surface, the fixed part has an inner top wall and an inner bottom wall, the top surface faces the inner top wall and the bottom surface faces the inner bottom wall, the top surface, the bottom surface, the inner top wall and the inner bottom wall are perpendicular to the second direction. When observed along the third direction, a first distance between the top surface and the inner top wall is smaller than a length of the guiding element in the second direction, and a second distance between the bottom surface and the inner bottom wall is smaller than the length of the guiding element in the second direction.

9. The optical element driving mechanism according to claim 8, wherein the guiding element has a cylindrical structure and extends along the second direction.

10. The optical element driving mechanism according to claim 8, wherein the guiding element has a spherical structure.

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