Optical Element Driving Device

Abstract

The present invention discloses an optical element driving device, which includes a housing, a base, a fixed frame, a first movable frame, a carrier, and a second movable frame. The base and the housing cooperate to form a chamber. An interval convex ring is provided inside the fixed frame. The surface of the interval convex ring and the housing form a first chamber, and the interval convex ring and the base form a second chamber. The first movable frame is arranged in the first chamber and moves along a first direction under the drive of a first piezoelectric driving mechanism. The carrier is arranged in the first movable frame and moves along a second direction under the drive of a second piezoelectric driving mechanism. And the second movable frame is arranged in the second chamber and moves along the optical axis direction under the drive of a third piezoelectric driving mechanism, wherein the first direction, the second direction, and the optical axis direction are perpendicular to each other. The optical element driving device of the present invention does not use electromagnetic driving technology, completely eliminates the problem of electromagnetic interference, and at the same time cancels auxiliary components such as suspension wires and reeds for resetting, enhancing the reliability of the motor.

Description

Technical Field

[0001] The present invention relates to the field of optics, and particularly to an optical element driving device. Background Art

[0002] The motors of traditional lens driving devices are usually installed in mobile phone camera modules and usually use the electromagnetic combination of magnets and coils for driving, generating magnetic field interference to other electronic components inside the mobile phone. In addition, auxiliaries such as suspension wires and reeds are usually used, which have metal fatigue themselves and will have irreversible deformation problems such as metal deformation after being impacted. Summary of the Invention

[0003] The purpose of the present invention is to provide an optical element driving device to solve the problems existing in the above-mentioned prior art.

[0004] To solve the above problems, according to one aspect of the present invention, an optical element driving device is provided. The optical element driving device includes: a housing; a base, the base and the housing cooperate to form a chamber; a fixed frame, the interior of the fixed frame is provided with spaced convex rings, the surface of the spaced convex ring facing the housing forms a first chamber with the housing, and the surface of the spaced convex ring facing the base forms a second chamber with the base; a first movable frame, the first movable frame is disposed in the first chamber and moves along a first direction under the drive of a first piezoelectric driving mechanism, a carrier, the carrier is disposed in the first movable frame and moves along a second direction under the drive of a second piezoelectric driving mechanism, and a second movable frame, the second movable frame is disposed in the second chamber and moves along the optical axis direction under the drive of a third piezoelectric driving mechanism, wherein the first direction, the second direction, and the optical axis direction are perpendicular to each other.

[0005] In one embodiment, the base is provided with a flexible circuit board and a display screen, the display screen is mounted on the surface of the flexible circuit board facing the housing and is electrically connected to the flexible circuit board.

[0006] Wherein, the area of the flexible circuit board surrounding the display screen is fixedly connected to the bottom end of the second movable frame, and the edge of the flexible circuit board is fixed to the edge of the base and the bottom end of the fixed frame.

[0007] When the third piezoelectric mechanism drives the second movable frame to move, the second movable frame drives the middle part of the flexible circuit board and the display screen to move along the optical axis direction for optical zooming, and when the third piezoelectric element is powered off, the elastic force of the flexible circuit board drives the second movable frame, the middle part of the flexible circuit board, and the imaging chip back to their original positions.

[0008] In one embodiment, the base is provided with a reinforcing plate, and the reinforcing plate is disposed on the lower surface of the flexible circuit board and fixedly connected to the flexible circuit board to enhance the structural stability of the imaging chip.

[0009] In one embodiment, the first piezoelectric driving mechanism includes a first piezoelectric block, a first friction rod, and a first friction plate. A first piezoelectric mounting groove is provided on the side wall of the first movable frame, and a first piezoelectric avoiding groove is provided on the side wall of the fixed frame.

[0010] The first piezoelectric block is disposed in the first piezoelectric avoiding groove, the first friction plate is fixedly installed in the first piezoelectric mounting groove, one end of the first friction rod abuts against the first piezoelectric block, and the other end of the first friction rod abuts against the first friction plate.

[0011] When the first piezoelectric block is energized, it deforms and drives the first friction rod to vibrate and transmits the vibration to the first friction plate, thereby driving the first movable frame to move in the first chamber along the first direction.

[0012] In one embodiment, the first piezoelectric driving mechanism further includes a first elastic sheet. The fixed frame is provided with a first elastic sheet mounting groove, and the first elastic sheet is mounted in the first elastic sheet mounting groove and applies pressure to the first piezoelectric block.

[0013] In one embodiment, the second piezoelectric driving mechanism includes a second piezoelectric block, a second friction rod, and a second friction plate. A second piezoelectric mounting groove is provided on the side wall of the carrier, and a second piezoelectric avoiding groove is provided on the side wall of the first movable frame.

[0014] The second piezoelectric block is disposed in the second piezoelectric avoiding groove, the second friction plate is fixedly disposed in the second piezoelectric mounting groove, one end of the second friction rod abuts against the second piezoelectric block, and the other end of the second friction rod abuts against the second friction plate.

[0015] When the second piezoelectric block is electrified, it deforms and drives the second friction rod to vibrate and transmits the vibration to the second friction plate, thereby driving the carrier to move in the first movable frame along the second direction; preferably, the second piezoelectric driving mechanism further includes a second elastic sheet. A second elastic sheet mounting groove is provided on the side wall of the first movable frame, and the second elastic sheet is mounted in the second elastic sheet mounting groove and applies pressure to the second piezoelectric block.

[0016] In one embodiment, the third piezoelectric driving mechanism includes a third piezoelectric block, a third friction rod, and a third friction plate. The second movable frame is provided with a third piezoelectric mounting groove, and a third piezoelectric avoiding groove is provided at the lower part of the fixed frame.

[0017] The third piezoelectric block is installed in the third piezoelectric avoidance groove, the third friction plate is installed in the third piezoelectric installation groove, one end of the third friction rod abuts against the third piezoelectric block, and the other end of the third friction rod abuts against the third friction plate.

[0018] When the third piezoelectric block is electrified, it deforms and drives the third friction rod to vibrate and transmits the vibration to the third friction plate, thereby driving the second movable frame to move along the optical axis direction in the second chamber; preferably, the third piezoelectric driving mechanism further includes a third elastic sheet, and the side wall of the fixed frame is provided with a third elastic sheet installation groove, and the third elastic sheet is installed in the third elastic sheet installation groove and applies pressure to the third piezoelectric block.

[0019] In one embodiment, the first elastic sheet installation groove and the third elastic sheet installation groove are arranged on the same side wall of the fixed frame, and the first elastic sheet installation groove is arranged outside the first chamber, the third elastic sheet installation groove is arranged outside the second chamber, and the first piezoelectric avoidance groove is arranged in the first elastic sheet installation groove, and the third piezoelectric avoidance groove is arranged in the third elastic sheet installation groove.

[0020] In one embodiment, the optical element driving device further includes a side circuit board, the side circuit board is bent at a right angle and forms a first part and a second part, the first part is arranged outside the second elastic sheet installation groove and is electrically connected to the second piezoelectric block, and the second part is arranged outside the first elastic sheet installation groove and the third elastic sheet installation groove and is electrically connected to the first piezoelectric block and the third piezoelectric block.

[0021] In one embodiment, the piezoelectric driving device further includes a first sensor and a first induction magnet, the side wall of the first movable frame is provided with a first induction magnet installation groove, the side wall of the fixed frame is provided with a first sensor avoidance groove, the first induction magnet is installed in the first induction magnet installation groove, and the first sensor is installed on the second part of the circuit board and is accommodated in the first sensor avoidance groove, and the displacement of the first movable frame in the first direction is detected by the cooperation of the first sensor and the first induction magnet.

[0022] In one embodiment, the first induction magnet installation groove and the first piezoelectric installation groove are arranged adjacent to each other.

[0023] In one embodiment, the piezoelectric driving device further includes a second sensor and a second induction magnet. A second induction magnet mounting groove is provided on the side wall of the carrier, and a second sensor avoidance groove is provided on the side wall of the first movable frame. The second induction magnet is mounted in the second induction magnet mounting groove, and the second sensor is mounted on the first part of the circuit board and accommodated in the second sensor avoidance groove. The displacement of the carrier in the second direction is detected by the cooperation of the second sensor and the second induction magnet.

[0024] In one embodiment, the second induction magnet mounting groove and the second piezoelectric mounting groove are arranged adjacent to each other.

[0025] In one embodiment, the piezoelectric driving device further includes a third sensor and a third induction magnet. A third induction magnet mounting groove is provided on the side wall of the second movable frame, and a third sensor avoidance groove is provided on the side wall of the fixed frame. The third induction magnet is mounted in the third induction magnet mounting groove, and the third sensor is mounted on the second part of the circuit board and accommodated in the third sensor avoidance groove. The displacement of the second movable frame in the upward direction of the optical axis is detected by the cooperation of the third sensor and the third induction magnet. Among them, the first sensor avoidance groove and the third sensor avoidance groove are provided on the same side wall of the fixed frame, and the first sensor avoidance groove is located below the third sensor avoidance groove.

[0026] In one embodiment, a first guiding mechanism is provided between the first movable frame and the fixed frame. The first movable frame moves along the first direction in the first chamber under the guidance of the first guiding mechanism; preferably, the first guiding mechanism includes a first guiding groove provided on the outer wall of the first movable frame and a first guide rail provided in the fixed frame.

[0027] In one embodiment, the first guiding groove is provided on the side wall of the first movable frame opposite to the first piezoelectric mounting groove.

[0028] In one embodiment, two first guiding grooves extending along the first direction are provided on the side wall of the first movable frame opposite to the first piezoelectric mounting groove, and the first guide rail is two first guide rods mounted in the fixed frame.

[0029] In one embodiment, a second guiding mechanism is provided between the first movable frame and the carrier. The carrier moves along the second direction in the first movable frame under the guidance of the second guiding mechanism; preferably, the second guiding mechanism includes a second guiding groove provided on the carrier and a second guide rail provided in the first movable frame.

[0030] In one embodiment, the second guiding groove is disposed on a sidewall of the carrier opposite to the second piezoelectric mounting groove.

[0031] In one embodiment, two second guiding grooves extending along the second direction are provided on a sidewall of the carrier opposite to the second piezoelectric mounting groove, and the second guide rail includes two second guiding rods mounted in the first movable frame.

[0032] In one embodiment, a third guiding mechanism is provided between the second movable frame and the fixed frame, and the second movable frame moves along the optical axis direction in the second chamber under the guidance of the third guiding mechanism.

[0033] In one embodiment, the third guiding mechanism includes a first ball groove provided on an outer wall of the second movable frame, a second ball groove provided on an inner wall of the second chamber, and balls. The first ball groove and the second ball groove cooperate to form a ball mounting groove, and the balls are arranged in the ball mounting groove. When the second movable frame moves along the optical axis direction, the balls roll and provide guidance for the second movable frame.

[0034] In one embodiment, the first ball groove is disposed on a sidewall of the second movable frame opposite to the third piezoelectric mounting groove.

[0035] In one embodiment, the first ball groove extends from an upper surface of the second movable frame to a lower surface.

[0036] In one embodiment, the third guiding mechanism includes three balls arranged along the optical axis direction. The outer diameters of the upper and lower balls are larger than the outer diameter of the middle ball. The middle ball does not generate friction with the inner wall of the ball mounting groove when the second movable frame moves along the optical axis direction and separates the upper and lower balls. When the third movable frame moves along the optical axis direction, it prevents the upper and lower balls from rotating in opposite directions and affecting the smoothness of ball rotation.

[0037] In the present invention, the first piezoelectric driving mechanism and the second piezoelectric driving mechanism respectively drive the carrier and the first movable member to drive the lens to move along the mutually perpendicular X-axis and Y-axis to realize the optical image stabilization function. In addition, the third piezoelectric driving mechanism drives the second movable member to drive the imaging chip to move along the optical axis direction to realize the optical zoom function. At the same time, the first guiding mechanism and the second guiding mechanism are realized by the cooperation of the guiding rod and the guiding groove, and the third guiding mechanism is realized by the cooperation of the pulley and the sliding groove. The concept is novel, the product structure is compact, the imaging quality is good, and it has a broad commercial use scenario.

[0038] The optical element driving device of the present invention does not use electromagnetic driving technology, completely eliminating the problem of electromagnetic interference. At the same time, auxiliary components such as suspension wires and reeds used for resetting are cancelled, enhancing the reliability of the motor. In addition, the second movable member is driven by the third piezoelectric driving mechanism to drive the display screen, that is, the imaging chip to move, integrating the functions of autofocus and optical image stabilization and realizing them through the movement of different components, having the technical effects of convenient control and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 FIG. is an exploded perspective view of an optical element driving device according to an embodiment of the present invention.

[0040] Figure 2 FIG. is another exploded perspective view of an optical element driving device according to an embodiment of the present invention.

[0041] Figure 3 FIG. is a top view of a piezoelectric driving device according to an embodiment of the present invention.

[0042] Figure 4 FIG. is a cross-sectional view of a piezoelectric driving device according to an embodiment of the present invention taken along line A-A in Figure 3 FIG.

[0043] Figure 5 FIG. is another top view of a piezoelectric driving device according to an embodiment of the present invention.

[0044] Figure 6 FIG. is a cross-sectional view of a piezoelectric driving device according to an embodiment of the present invention taken along line B-B in Figure 5 FIG.

[0045] Figure 7 FIG. is a perspective view of a side circuit board according to an embodiment of the present invention.

[0046] Figure 8 FIG. is a perspective view of a second movable frame according to an embodiment of the present invention.

[0047] Figure 9 FIG. is a perspective view of a second movable frame assembled to a fixed frame according to an embodiment of the present invention.

[0048] Figure 10 FIG. is an exploded perspective view of a side circuit board and a third piezoelectric driving mechanism according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to more clearly understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not limitations on the scope of the present invention, but only to illustrate the essential spirit of the technical solution of the present invention.

[0050] In the following description, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other instances, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail so as not to unnecessarily obscure the description of the embodiments.

[0051] References to "one embodiment" or "an embodiment" in the course of the specification mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Additionally, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0052] In the following description, in order to clearly show the structure and working mode of the present invention, many directional terms will be used for description. However, terms such as "front", "rear", "left", "right", "outer", "inner", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as limiting terms.

[0053] This application relates to an optical element driving device, which can be used in terminal products such as mobile phones and tablet computers to cooperate with a lens to achieve functions such as taking pictures and videos. For the convenience of description, this application introduces the concept of "optical axis" to represent the propagation direction of light in the optical element. It is an abstract concept and does not refer to the existence of a physically meaningful axis, and the direction along the optical axis is called the longitudinal direction.

[0054] It should be noted that the features shown in the drawings of this application may belong to one embodiment or different embodiments as long as there is no conflict between these features. To save space, this application can use the same drawing to illustrate different embodiments. That is to say, the same drawing of this application can be used to embody the features in different embodiments.

[0055] Figure 1 is an exploded perspective view of the optical element driving device according to an embodiment of the present invention, as Figure 1As shown, the optical element driving device 100 includes a housing 10, a base 20, a fixed frame 30, a first movable frame 40, a second movable frame 50, and a carrier 60. The base 20 and the housing 10 cooperate to form a chamber. An interval convex ring 31 is provided inside the fixed frame 30. The interval convex ring 31 extends integrally inward from the inner side wall of the fixed frame by a certain distance and is generally located in the middle of the fixed frame along the optical axis direction. The surface of the interval convex ring 31 facing the housing 10 and the housing 10 form a first chamber, and the surface of the interval convex ring 31 facing the base 20 and the base 20 form a second chamber. The first movable frame 40 is disposed in the first chamber and moves along a first direction under the drive of a first piezoelectric driving mechanism 70. The carrier 60 is disposed in the first movable frame 40 and moves along a second direction under the drive of a second piezoelectric driving mechanism 80. The second movable frame 50 is disposed in the second chamber and moves along the optical axis direction under the drive of a third piezoelectric driving mechanism 90. Among them, the first direction, the second direction, and the optical axis direction are perpendicular to each other. That is to say, if the optical axis direction is defined as the Z-axis direction, the first direction can also be defined as the X-axis direction, and the second direction can also be defined as the Y-axis direction. The carrier 60 is used to mount an optical element such as a lens. The second piezoelectric driving mechanism 80 drives the carrier to move in the Y-axis direction, and the first piezoelectric driving mechanism 70 drives the first movable frame 40 and the carrier 60 disposed in the first movable frame 40 to move along the X-axis direction, thereby realizing the optical image stabilization function. The third piezoelectric driving mechanism 80 drives the second movable frame to move along the optical axis direction, thereby realizing the optical zoom function.

[0056] Figure 2 is another three-dimensional exploded view of the optical element driving device according to an embodiment of the present invention, as Figure 1-2 shown, in one embodiment, the base 20 is provided with a flexible circuit board 21 and a display screen 22. The display screen 22 can be, for example, an imaging chip, which is installed in the middle 213 of the surface of the flexible circuit board 21 facing the housing and is electrically connected to the flexible circuit board 21. The area 212 of the flexible circuit board 21 surrounding the display screen 22 is fixedly connected to the bottom end of the second movable frame 50. The edge 211 of the flexible circuit board 21 is fixed to the bottom ends of the base 20 and the fixed frame 30. That is to say, the upper surface of the edge 211 of the flexible circuit board 21 is fixed to the bottom end of the fixed frame 30, and the lower surface of the edge 211 of the flexible circuit board 21 is fixed to the surface of the base 20. For example, in one embodiment, as Figure 2As shown, a raised ring 24 protruding upward is formed at the edge of the base 20, and a sunken portion 25 is formed inside the raised ring 24. The edge 211 of the flexible circuit board 21 is fixedly arranged in the sunken portion 25, and the lower surface of the edge 211 of the flexible circuit board 21 is fixedly connected to the sunken portion 25, and the upper surface of the edge 211 of the flexible circuit board 21 is fixedly connected to the lower surface of the fixed frame 30. When the third piezoelectric mechanism 90 drives the second movable frame 50 to move, the second movable frame 50 drives the middle portion 213 of the flexible circuit board 21 and the display screen 22 to move along the optical axis direction for optical zoom. The elastic force of the flexible circuit board 21 can assist the second movable frame 50, the middle portion 213 of the flexible circuit board 21, and the display screen 22 to return to their original positions. From Figure 1 it can be clearly seen that the middle portion 213 of the flexible circuit board 21 is connected to the region 212 through the first elastic portion 214, and the region 212 is connected to the edge 211 through the second elastic portion 215.

[0057] From the above description, it can be seen that the optical element driving device of the present invention does not use electromagnetic driving technology, completely eliminates the problem of electromagnetic interference, and at the same time cancels auxiliary components such as suspension wires and reeds for resetting, enhancing the reliability of the motor. In addition, by driving the second movable member by the third piezoelectric driving mechanism to drive the display screen, that is, the imaging chip to move, the functions of autofocus and optical anti-shake are integrated into one and at the same time realized by the movement of different components, having the technical effects of convenient control and high imaging quality.

[0058] In one embodiment, the base 20 is provided with a reinforcing plate 23. The reinforcing plate 23 is arranged on the lower surface of the flexible circuit board 21 and fixedly connected to the flexible circuit board to strengthen the structural stability of the display screen 22. Specifically, the reinforcing plate 23 is arranged on the lower surface of the middle portion 213 of the flexible circuit board 21, and the display screen 23 is arranged on the upper surface of the middle portion 213 of the flexible circuit board 21, so that the reinforcing plate 23 can play a role in strengthening the structural stability of the display screen 22.

[0059] Figure 3 is a top view of the piezoelectric driving device according to an embodiment of the present invention, Figure 4 is a cross-sectional view of the piezoelectric driving device according to an embodiment of the present invention taken along Figure 3 the line A-A in Figure 5 is another top view of the piezoelectric driving device according to an embodiment of the present invention, Figure 6 is a cross-sectional view of the piezoelectric driving device according to an embodiment of the present invention taken along Figure 5 the line B-B in Figure 1-6As shown, the first piezoelectric driving mechanism 70 includes a first piezoelectric block 71, a first friction bar 72, and a first friction plate 73. A first piezoelectric mounting groove 41 is provided on the side wall of the first movable frame 40, and a first piezoelectric avoidance groove 32 is provided on the side wall of the fixed frame 30. The first piezoelectric block 71 is disposed in the first piezoelectric avoidance groove 32, the first friction plate 73 is fixedly installed in the first piezoelectric mounting groove 41, one end of the first friction bar 72 abuts against the inner surface of the first piezoelectric block 71, and is fixedly connected to the inner surface of the first piezoelectric block 71 by, for example, glue. The other end of the first friction bar 72 abuts against the first friction plate 73. When the first piezoelectric block 71 is energized, its outer shape changes. By adjusting the current frequency, the outer diameter of the first piezoelectric block changes rapidly, thereby driving the first friction bar 72 to vibrate and transmitting the vibration to the first friction plate 73 through the first friction bar 72, thereby driving the first movable frame 40 to move in the first chamber in the first direction, i.e., the X direction.

[0060] Optionally, the first piezoelectric driving mechanism 70 further includes a first elastic sheet 74. The fixed frame 30 is provided with a first elastic sheet mounting groove 33. The first elastic sheet 74 is installed in the first elastic sheet mounting groove 33 and applies pressure to the first piezoelectric block 71. That is, the first elastic sheet 74 presses the first piezoelectric block 71 to make the contact effect between the first friction bar 72 and the first friction plate 73 better, improve the friction between the two, and thus improve the driving effect of the first piezoelectric mechanism 70. Optionally, the first elastic sheet 74 is provided with a first power supply hole 741, and power is supplied to the first piezoelectric block 71 through the first power supply hole 741.

[0061] Similar to the first piezoelectric driving mechanism, the second piezoelectric driving mechanism 80 includes a second piezoelectric block 81, a second friction bar 82, and a second friction plate 83. A second piezoelectric mounting groove 61 is provided on the side wall of the carrier 60, and a second piezoelectric avoidance groove 42 is provided on the side wall of the first movable frame 40. The second piezoelectric block 81 is disposed in the second piezoelectric avoidance groove 42, the second friction plate 83 is fixedly disposed in the second piezoelectric mounting groove 61, one end of the second friction bar 82 abuts against the second piezoelectric block 81, and is fixedly connected to the second piezoelectric block 81, for example, by glue bonding. The other end of the second friction bar 82 abuts against the second friction plate 83. When the second piezoelectric block 81 is energized, its outer shape changes. By adjusting the current frequency, the outer diameter of the second piezoelectric block changes rapidly, thereby driving the second friction bar 82 to vibrate and transmitting the vibration to the second friction plate 73 through the second friction bar 82, thereby driving the carrier 60 to move in the first movable frame 40 in the second direction, i.e., the Y-axis direction.

[0062] Optionally, the second piezoelectric driving mechanism 80 further includes a second elastic piece 84. A second elastic piece mounting groove 43 is provided on the side wall of the first movable frame 40. The second elastic piece 84 is mounted in the second elastic piece mounting groove 43 and applies pressure to the second piezoelectric block 81. That is, the second elastic piece 84 squeezes the second piezoelectric block 81 to make the contact effect between the second friction rod 82 and the second friction plate 83 better, increasing the friction force between the two, thereby improving the driving effect of the second piezoelectric mechanism 80. Optionally, the second elastic piece 84 is provided with a second power supply hole 841, and power is supplied to the second piezoelectric block 81 through the second power supply hole 841.

[0063] Similar to the first piezoelectric driving mechanism and the second piezoelectric driving mechanism, the third piezoelectric driving mechanism 90 includes a third piezoelectric block 91, a third friction rod 92, and a third friction plate 93. The second movable frame 50 is provided with a third piezoelectric mounting groove 51, and the lower part of the fixed frame 30 is provided with a third piezoelectric avoiding groove 34. The third piezoelectric block 81 is mounted in the third piezoelectric avoiding groove 34, the third friction plate 93 is mounted in the third piezoelectric mounting groove 51, one end of the third friction rod 92 abuts against the third piezoelectric block 91, and the other end of the third friction rod 92 abuts against the third friction plate 93. The third piezoelectric block 91 will generate an external shape change through electricity. By adjusting the current frequency, the outer diameter of the third piezoelectric block will change rapidly, thereby driving the third friction rod 92 to vibrate and transmitting the vibration to the third friction plate 93 through the third friction rod 92, thereby driving the second movable frame 50 to move in the second chamber along the second direction, that is, the Y-axis direction. Optionally, the third piezoelectric driving mechanism 90 further includes a third elastic piece 94. A third elastic piece mounting groove 35 is provided on the side wall of the fixed frame 30. The third elastic piece 94 is mounted in the third elastic piece mounting groove 35 and applies pressure to the third piezoelectric block 91. That is, the third elastic piece 94 squeezes the third piezoelectric block 91 to make the contact effect between the third friction rod 92 and the third friction plate 93 better, increasing the friction force between the two, thereby improving the driving effect of the third piezoelectric mechanism 90. Optionally, the third elastic piece 94 is provided with a third power supply hole 941, and power is supplied to the third piezoelectric block 91 through the third power supply hole 941.

[0064] Refer to Figure 2 , the first elastic piece mounting groove 33 and the third elastic piece mounting groove 34 are provided on the same side wall of the fixed frame 30. Specifically, the first elastic piece mounting groove 33 is provided on the outside of the first chamber, the third elastic piece mounting groove 34 is provided on the outside of the second chamber, the first piezoelectric avoiding groove 32 is provided in the first elastic piece mounting groove 33, and the third piezoelectric avoiding groove 34 is provided in the third elastic piece mounting groove 34.

[0065] Refer to Figure 2, in one embodiment, the optical element driving device 100 further includes a side circuit board 11. The side circuit board 11 is bent at a right angle to form a first portion 111 and a second portion 112. The first portion 111 is disposed outside the second elastic piece mounting groove 43 and is electrically connected to the second piezoelectric block 81. The second portion 112 is disposed outside the first elastic piece mounting groove 33 and the third elastic piece mounting groove 34 and is electrically connected to the first piezoelectric block 71 and the third piezoelectric block 91.

[0066] In one embodiment, the first piezoelectric driving mechanism 70 further includes a first sensor 75 and a first induction magnet 76. A first induction magnet mounting groove 44 is provided on the side wall of the first movable frame 40, and a first sensor avoidance groove 36 is provided on the side wall of the fixed frame 30. The first induction magnet 76 is mounted in the first induction magnet mounting groove 44, and the first sensor 75 is mounted on the second portion 112 of the side circuit board 11 and is received in the first sensor avoidance groove 36. The displacement of the first movable frame 40 in the first direction, i.e., the X-axis direction, is detected by the cooperation of the first sensor 75 and the first induction magnet 76. Optionally, the first induction magnet mounting groove 36 and the first piezoelectric mounting groove 32 are arranged adjacent to each other.

[0067] Similarly, in one embodiment, the second piezoelectric driving mechanism 80 further includes a second sensor 85 and a second induction magnet 86. A second induction magnet mounting groove 62 is provided on the side wall of the carrier, and a second sensor avoidance groove 45 is provided on the side wall of the first movable frame 40. The second induction magnet 86 is mounted in the second induction magnet mounting groove 62, and the second sensor 85 is mounted on the first portion 111 of the side circuit board 11 and is received in the second sensor avoidance groove 45. The displacement of the carrier 60 in the second direction, i.e., the Y-axis direction, is detected by the cooperation of the second sensor 85 and the second induction magnet 86. Optionally, the second induction magnet mounting groove 62 and the second piezoelectric mounting groove 61 are arranged adjacent to each other.

[0068] Similarly, in one embodiment, the third piezoelectric driving mechanism 90 further includes a third sensor 95 and a third induction magnet 96. A third induction magnet mounting groove 52 is provided on the side wall of the second movable frame 50, and a third sensor avoidance groove 37 is provided on the side wall of the fixed frame 30. The third induction magnet 96 is mounted in the third induction magnet mounting groove 52, and the third sensor 95 is mounted on the second portion 112 of the side circuit board 11 and is received in the third sensor avoidance groove 37. The displacement of the second movable frame 50 in the optical axis upward direction is detected by the cooperation of the third sensor 95 and the third induction magnet 96. Among them, the first sensor avoidance groove 36 and the third sensor avoidance groove 37 are provided on the same side wall of the fixed frame, and the third sensor avoidance groove 37 is located below the second sensor avoidance groove 36.

[0069] The following refers to Figure 7 to describe the side circuit board 11 of an embodiment of the present invention. AsFigure 7 As shown, the side circuit board 11 generally includes a first part 111 and a second part 112. At one end of the first part 111 away from the second part 112, there is a first rectangular block 113. The inner surface of the rectangular block 113 is used to mount the second sensor 85. Adjacent to the first rectangular block 113, there is a first elastic buckle 114. When the side circuit board is mounted on the fixed frame 30, the first elastic buckle 114 is aligned with the second power-on hole 841 of the second elastic sheet 84, and the second power-on hole 841 is aligned with the second piezoelectric block 81. Thus, the first elastic buckle 114 can apply pressure to the second piezoelectric block 81, making the contact effect between the second friction rod 82 and the second friction plate 83 better, increasing the friction force between the two, and thus improving the driving effect of the second piezoelectric mechanism 80.

[0070] At one end of the second part 112 of the side circuit board 11 away from the first part 111, there is a second rectangular block 115. The second rectangular block 115 cooperates with the side of the fixed frame 30 where the first elastic sheet mounting groove and the third elastic sheet mounting groove are provided and extends from the top to the bottom of the fixed frame 30 so as to cover the first sensor avoidance groove 36 and the third sensor avoidance groove 37. The first sensor 75 and the third sensor 95 are mounted on the surface of the second rectangular block 114 of the side circuit board 11 and are respectively received in the first sensor avoidance groove 36 and the third sensor avoidance groove 37 to cooperate with the corresponding first induction magnet and third induction magnet on the first movable frame and the second movable frame to detect the displacement of the first movable frame and the third movable frame. Adjacent to the upper side and the lower side of the second rectangular block 115, a second elastic buckle 116 and a third elastic buckle 117 are respectively provided. The second elastic buckle 116 is aligned with the first power-on hole 741 of the first elastic sheet 74 and the first piezoelectric block 71, and the third elastic buckle 117 is aligned with the third power-on hole 941 of the third elastic sheet 94 and the third piezoelectric block 91. Thus, the second elastic buckle 116 can apply pressure to the first piezoelectric block 71, making the contact effect between the first friction rod 72 and the first friction plate 73 better, increasing the friction force between the two, and thus improving the driving effect of the first piezoelectric mechanism 80, and the third elastic buckle 117 can apply pressure to the third piezoelectric block 91, making the contact effect between the third friction rod 92 and the third friction plate 93 better, increasing the friction force between the two, and thus improving the driving effect of the third piezoelectric mechanism 90.

[0071] Return reference Figure 1-2, a first guiding mechanism is provided between the first movable frame 40 and the fixed frame 30. The first movable frame moves in the first chamber along the first direction, i.e., the X-axis direction, under the guidance of the first guiding mechanism. Optionally, the first guiding mechanism includes a first guiding groove 46 provided on the outer wall of the first movable frame and a first guide rail 12 provided in the fixed frame 30. Specifically, the first guiding groove 46 is provided on the side wall of the first movable frame 40 opposite to the second piezoelectric mounting groove and the third piezoelectric mounting groove. For example, two first guiding grooves 46 extending along the first direction are provided on the side wall of the first movable frame 40 opposite to the second piezoelectric mounting groove, and the first guide rail includes two first guide rods 12 mounted in the fixed frame 30. One side wall of the first movable frame 40 is suspended on the first guide rod 12 through the first guiding groove 46, and the side wall opposite to the side wall provided with the guiding groove 46 is driven by the first piezoelectric driving mechanism 70.

[0072] Similarly, a second guiding mechanism is provided between the first movable frame 40 and the carrier 60. The carrier moves in the first movable frame along the second direction under the guidance of the second guiding mechanism. Optionally, the second guiding mechanism includes a second guiding groove 63 provided on the carrier 60 and a second guide rail 13 provided in the first movable frame 40. Specifically, the second guiding groove 63 is provided on the side wall of the carrier opposite to the second piezoelectric mounting groove 61. Optionally, two second guiding grooves 63 extending along the second direction are provided on the side wall of the carrier 60 opposite to the second piezoelectric mounting groove 61, and the second guide rail includes two second guide rods 13 mounted in the first movable frame. One side wall of the carrier 60 is suspended on the second guide rod 13 through the second guiding groove 63, and the side wall opposite to the side wall provided with the second guiding groove 63 is driven by the second piezoelectric driving mechanism 80.

[0073] It can be seen from Figure 1-2 that the carrier is movably mounted in the first movable frame 40 on two opposite side walls through the second piezoelectric driving mechanism and the second guiding mechanism and moves along the second guiding mechanism under the drive of the second piezoelectric driving mechanism. The setting direction of the second guiding mechanism is the second direction, that is, the Y-axis direction. The first movable frame 40 installed with the carrier 60 is movably mounted in the first chamber of the fixed frame on two opposite side walls through the first piezoelectric driving mechanism and the first guiding mechanism and moves along the first direction, i.e., the X-axis direction, under the drive of the first piezoelectric driving mechanism. Since the carrier is installed in the first movable frame 40, when the first movable frame 40 moves along the X-axis direction, the carrier 60 also moves along the X-axis direction following the first movable frame 40. That is to say, through its own movement and with the drive of the first movable frame, the carrier realizes the movement along the mutually perpendicular X-axis and Y-axis perpendicular to the optical axis, thus realizing the optical anti-shake function of the lens.

[0074] Continue to refer to Figure 1-2, a third guiding mechanism is provided between the second movable frame 50 and the fixed frame 40, and the second movable frame moves along the optical axis direction in the second chamber under the guidance of the third guiding mechanism; specifically, referring to Figure 8-9 , which shows the specific structure of an embodiment of the third guiding mechanism. The third guiding mechanism includes a first ball groove 53 provided on the outer wall of the second movable frame, a second ball groove 38 provided on the inner wall of the second chamber of the fixed frame 30, and balls 39. The first ball groove 53 cooperates with the second ball groove 38 to form a ball mounting groove, and the balls 39 are arranged in the ball mounting groove. When the second movable frame moves along the optical axis direction, the balls roll and provide guidance for the second movable frame 50. Optionally, the first ball groove 53 is provided on the side wall of the second movable frame 50 opposite to the third piezoelectric mounting groove 51. Preferably, the first ball groove 53 extends from the upper surface to the lower surface of the second movable frame. The third guiding mechanism includes three balls 39, and the three balls 39 are arranged along the optical axis direction. The outer diameters of the upper and lower balls are larger than the outer diameter of the middle ball. The middle ball does not generate friction with the inner wall of the ball mounting groove when the second movable frame moves along the optical axis direction and separates the upper and lower balls. When the third movable frame 50 moves along the optical axis direction, it prevents the upper and lower balls from rotating in opposite directions and affecting the smoothness of the ball rotation.

[0075] Next, referring to Figure 10 , the installation of the piezoelectric driving mechanism and the side circuit board of the present invention will be described with the third piezoelectric driving mechanism. As Figure 10 shown, the third elastic piece 94 is provided outside the side circuit board 11 and embedded inside the third elastic buckle 117. The third piezoelectric block 91 is arranged opposite to the third power-on hole 941. One end of the third friction rod 92 is fixed on the surface of the third piezoelectric block 91, and the other end of the third friction rod 93 contacts the third friction piece 93. The third friction piece 93 is fixedly installed in the third piezoelectric mounting groove of the second movable member. When the third piezoelectric block 91 is powered on, its geometric shape changes rapidly. By adjusting the power supply frequency, the rapid change in the volume of the third piezoelectric block 91 will cause the vibration of the friction rod, and drive the friction piece to move through the contact between the friction rod and the friction piece. Since the third friction piece is fixed on the second movable member, the friction piece drives the second movable member to move together when the friction piece moves. For example, in Figure 9 the shown embodiment, the third driving mechanism drives the second movable member to move along the optical axis direction. Since the bottom of the second movable member is connected to the display screen, the second movable member drives the display screen to move together when it moves, so as to change the distance between the display screen and the lens on the carrier, thereby realizing the optical zoom function. It should be noted that, as described above, the zoom function of the present invention is not achieved by driving the lens to move, but by driving the imaging chip to move.

[0076] In summary, in the present invention, the carrier and the first movable member are respectively driven by the first piezoelectric driving mechanism and the second piezoelectric driving mechanism to drive the lens to move along the mutually perpendicular X-axis and Y-axis, so as to realize the optical anti-shake function. In addition, the third piezoelectric driving mechanism drives the second movable member to drive the imaging chip to move along the optical axis direction to realize the optical zoom function. At the same time, the first guiding mechanism and the second guiding mechanism are realized by the cooperation of the guiding rod and the guiding groove, and the third guiding mechanism is realized by the cooperation of the pulley and the sliding groove. The concept is novel, the product structure is compact, the imaging quality is good, and it has a broad commercial application scenario.

[0077] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims

1. An optical element driving device, characterized in that, The optical element driving device includes: A housing; A base, which cooperates with the housing to form a chamber; A fixed frame, with spaced convex rings inside the fixed frame. The surface of the spaced convex ring facing the housing forms a first chamber with the housing, and the surface of the spaced convex ring facing the base forms a second chamber with the base; A first movable frame, which is arranged in the first chamber and moves along a first direction under the drive of a first piezoelectric driving mechanism, A carrier, which is arranged in the first movable frame and moves along a second direction under the drive of a second piezoelectric driving mechanism, and A second movable frame, which is arranged in the second chamber and moves along the optical axis direction under the drive of a third piezoelectric driving mechanism, where The first direction, the second direction, and the optical axis direction are perpendicular to each other; The first piezoelectric driving mechanism includes a first piezoelectric block, a first friction rod, and a first friction plate. A first piezoelectric mounting groove is provided on the side wall of the first movable frame, and a first piezoelectric avoidance groove is provided on the side wall of the fixed frame, The first piezoelectric block is arranged in the first piezoelectric avoidance groove, the first friction plate is fixedly installed in the first piezoelectric mounting groove, one end of the first friction rod abuts against the first piezoelectric block, and the other end of the first friction rod abuts against the first friction plate, When the first piezoelectric block is energized, it deforms and drives the first friction rod to vibrate and transmits this vibration to the first friction plate, thereby driving the first movable frame to move along the first direction in the first chamber; The first piezoelectric driving mechanism further includes a first elastic sheet. The fixed frame is provided with a first elastic sheet mounting groove, and the first elastic sheet is mounted in the first elastic sheet mounting groove and applies pressure to the first piezoelectric block; The second piezoelectric driving mechanism includes a second piezoelectric block, a second friction rod, and a second friction plate. A second piezoelectric mounting groove is provided on the side wall of the carrier, and a second piezoelectric avoidance groove is provided on the side wall of the first movable frame, The second piezoelectric block is arranged in the second piezoelectric avoidance groove, the second friction plate is fixedly arranged in the second piezoelectric mounting groove, one end of the second friction rod abuts against the second piezoelectric block, and the other end of the second friction rod abuts against the second friction plate, and When the second piezoelectric block is electrified, it deforms and drives the second friction rod to vibrate and transmits this vibration to the second friction plate, thereby driving the carrier to move along the second direction in the first movable frame; The second piezoelectric driving mechanism further includes a second elastic sheet. The side wall of the first movable frame is provided with a second elastic sheet mounting groove, and the second elastic sheet is mounted in the second elastic sheet mounting groove and applies pressure to the second piezoelectric block.

2. The optical element driving device according to claim 1, wherein The base is provided with a flexible circuit board and a display screen. The display screen is mounted on the surface of the flexible circuit board facing the housing and is electrically connected to the flexible circuit board, Wherein, the area of the flexible circuit board surrounding the display screen is fixedly connected to the bottom end of the second movable frame, and the edge of the flexible circuit board is fixed to the edge of the base and the bottom end of the fixed frame, When the third piezoelectric driving mechanism drives the second movable frame to move, the second movable frame drives the middle part of the flexible circuit board and the display screen to move along the optical axis direction for optical zooming. When the third piezoelectric driving mechanism is powered off, the elastic force of the flexible circuit board drives the second movable frame, the middle part of the flexible circuit board, and the imaging chip back to their original positions.

3. The optical element driving device according to claim 2, wherein The base is provided with a reinforcing plate, which is arranged on the lower surface of the flexible circuit board and fixedly connected to the flexible circuit board to enhance the structural stability of the imaging chip.

4. The optical element driving device according to claim 1, wherein The third piezoelectric driving mechanism includes a third piezoelectric block, a third friction rod, and a third friction plate. The second movable frame is provided with a third piezoelectric mounting groove, and the lower part of the fixed frame is provided with a third piezoelectric avoiding groove. The third piezoelectric block is mounted in the third piezoelectric avoiding groove, the third friction plate is mounted in the third piezoelectric mounting groove, one end of the third friction rod abuts against the third piezoelectric block, and the other end of the third friction rod abuts against the third friction plate. When the third piezoelectric block is energized, it deforms and drives the third friction rod to vibrate and transmits the vibration to the third friction plate, thereby driving the second movable frame to move along the optical axis direction in the second chamber.

5. The optical element driving device according to claim 4, characterized in that, The third piezoelectric driving mechanism further includes a third elastic sheet. The side wall of the fixed frame is provided with a third elastic sheet mounting groove, and the third elastic sheet is mounted in the third elastic sheet mounting groove and applies pressure to the third piezoelectric block.

6. The optical element driving device according to claim 5, wherein The first elastic sheet mounting groove and the third elastic sheet mounting groove are arranged on the same side wall of the fixed frame. The first elastic sheet mounting groove is arranged outside the first chamber, the third elastic sheet mounting groove is arranged outside the second chamber, the first piezoelectric avoiding groove is arranged in the first elastic sheet mounting groove, and the third piezoelectric avoiding groove is arranged in the third elastic sheet mounting groove.

7. The optical element driving device according to claim 4, wherein The optical element driving device further includes a side circuit board, which is bent at a right angle to form a first part and a second part. The first part is arranged outside the second elastic sheet mounting groove and is electrically connected to the second piezoelectric block, and the second part is arranged outside the first elastic sheet mounting groove and the third elastic sheet mounting groove and is electrically connected to the first piezoelectric block and the third piezoelectric block.

8. The optical element driving device according to claim 7, wherein The first piezoelectric driving mechanism further includes a first sensor and a first induction magnet. The side wall of the first movable frame is provided with a first induction magnet mounting groove, the side wall of the fixed frame is provided with a first sensor avoiding groove, the first induction magnet is mounted in the first induction magnet mounting groove, and the first sensor is mounted on the second part of the circuit board and is accommodated in the first sensor avoiding groove. The displacement of the first movable frame in the first direction is detected by the cooperation of the first sensor and the first induction magnet.

9. The optical element driving device according to claim 8, characterized in that, The first induction magnet mounting groove and the first piezoelectric mounting groove are arranged adjacent to each other.

10. The optical element driving device according to claim 8, wherein, The second piezoelectric driving mechanism further includes a second sensor and a second induction magnet. A second induction magnet mounting groove is provided on the side wall of the carrier. A second sensor avoidance groove is provided on the side wall of the first movable frame. The second induction magnet is mounted in the second induction magnet mounting groove. The second sensor is mounted on the first part of the circuit board and accommodated in the second sensor avoidance groove. The displacement of the carrier in the second direction is detected by the cooperation of the second sensor and the second induction magnet.

11. The optical element driving device according to claim 10, characterized in that, The second induction magnet mounting groove is arranged adjacent to the second piezoelectric mounting groove.

12. The optical element driving device according to claim 11, wherein, The third piezoelectric driving mechanism further includes a third sensor and a third induction magnet. A third induction magnet mounting groove is provided on the side wall of the second movable frame. A third sensor avoidance groove is provided on the side wall of the fixed frame. The third induction magnet is mounted in the third induction magnet mounting groove. The third sensor is mounted on the second part of the circuit board and accommodated in the third sensor avoidance groove. The displacement of the second movable frame in the optical axis direction is detected by the cooperation of the third sensor and the third induction magnet. Wherein, the first sensor avoidance groove and the third sensor avoidance groove are provided on the same side wall of the fixed frame, and the first sensor avoidance groove is located below the third sensor avoidance groove.

13. The optical element driving device according to claim 4, characterized in that, A first guiding mechanism is provided between the first movable frame and the fixed frame. The first movable frame moves along the first direction in the first chamber under the guidance of the first guiding mechanism.

14. The optical element driving device according to claim 13, characterized in that, The first guiding mechanism includes a first guiding groove provided on the outer wall of the first movable frame and a first guiding rail provided in the fixed frame.

15. The optical element driving device according to claim 14, wherein The first guiding groove is provided on the side wall of the first movable frame opposite to the first piezoelectric mounting groove.

16. The optical element driving device according to claim 15, wherein, Two first guiding grooves extending along the first direction are provided on the side wall of the first movable frame opposite to the first piezoelectric mounting groove, and the first guiding rail is two first guiding rods mounted in the fixed frame.

17. The optical element driving device according to claim 16, wherein A second guiding mechanism is provided between the first movable frame and the carrier. The carrier moves along the second direction in the first movable frame under the guidance of the second guiding mechanism.

18. The optical element driving device according to claim 17, wherein, The second guiding mechanism includes a second guiding groove provided on the carrier and a second guiding rail provided in the first movable frame.

19. The optical element driving device according to claim 18, wherein The second guiding groove is provided on the side wall of the carrier opposite to the second piezoelectric mounting groove.

20. The optical element driving device according to claim 19, wherein, Two second guiding grooves extending along the second direction are provided on the side wall of the carrier opposite to the second piezoelectric mounting groove, and the second guiding rail includes two second guiding rods mounted in the first movable frame.

21. The optical element driving device according to claim 20, characterized in that, A third guiding mechanism is provided between the second movable frame and the fixed frame. The second movable frame moves along the optical axis direction in the second chamber under the guidance of the third guiding mechanism.

22. The optical element driving device according to claim 21, wherein The third guiding mechanism includes a first ball groove provided on the outer wall of the second movable frame, a second ball groove provided on the inner wall of the second chamber, and balls. The first ball groove cooperates with the second ball groove to form a ball mounting groove, and the balls are arranged in the ball mounting groove. When the second movable frame moves along the optical axis direction, the balls roll and provide guidance for the second movable frame.

23. The optical element driving device according to claim 22, wherein, The first ball groove is provided on the side wall of the second movable frame opposite to the third piezoelectric mounting groove.

24. The optical element driving device according to claim 23, wherein The first ball groove extends from the upper surface to the lower surface of the second movable frame.

25. The optical element driving device according to claim 24, wherein, The third guiding mechanism includes three balls, and the three balls are arranged along the optical axis direction, wherein the outer diameters of the upper and lower balls are larger than the outer diameter of the middle ball.

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