CN212540826U - Optical element driving device - Google Patents

Abstract

The utility model discloses an optical element drive arrangement, including frame, carrier, base and drive module, this carrier is used for bearing optical element and movably installs between this frame and this base, and this carrier of this drive module drive is for this base along this optical element's optical axis direction motion, and wherein this optical element drive module drives this carrier through this piezoelectric element including setting up the piezoelectric element on this base. The utility model discloses an optical element drive arrangement need not electromagnetic drive technique, stops completely to avoid the electromagnetic interference problem, cancels the auxiliary component that suspension wire, reed etc. are used as and reset simultaneously, has strengthened the reliability of motor.

Description

Optical element driving device

Technical Field

The utility model relates to an optical imaging field, concretely relates to optical element drive arrangement.

Background

The motor of the geared lens driving device is typically mounted within the camera module of the mobile phone and is typically driven by an electromagnetic combination of magnets and coils, which generate a magnetic field that interferes with other electronic components such as the interior of the mobile phone. In addition, the suspension wires, the reeds and the like are usually adopted for assistance, and the irreversible deformation problems such as metal fatigue and metal deformation can be caused after the metal fatigue is suffered from impact.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide an optical element driving device to solve the problems existing in the prior art.

In order to solve the above problem, according to an aspect of the present invention, there is provided an optical element driving device, the optical element driving device includes a frame, a carrier, a base, and a driving module, the carrier is used for carrying an optical element and movably installed between the frame and the base, the driving module drives the carrier to move along an optical axis direction of the optical element relative to the base, wherein the optical element driving module includes a piezoelectric element disposed on the base, and the carrier is driven by the piezoelectric element.

In one embodiment, the optical element driving module further includes a friction member movably mounted on the base and cooperating with the piezoelectric element, and the piezoelectric element drives the friction member to move and drives the carrier to move through the friction member.

In one embodiment, the optical element driving module further comprises a friction plate disposed on the carrier, the friction plate is engaged with a friction member disposed on the base, and the friction plate is driven to move by the movement of the friction member, so as to drive the carrier to move.

In one embodiment, the friction plates are arranged in a direction perpendicular to the optical axis, and the friction members are arranged in a direction parallel to the optical axis.

In one embodiment, the friction member is a friction bar, the piezoelectric element engages an end surface of the friction bar, and the friction plate engages a side surface of the friction bar.

In one embodiment, the upper portion of the friction plate forms a cross-shaped structure and includes horizontal portions and vertical portions which are alternately arranged, and the lower portion of the friction plate forms a friction portion which forms an arc-shaped structure and has a concave surface which is a friction surface to be engaged with a side surface of the friction bar; preferably, the horizontal portion and the vertical portion are integrally formed.

In one embodiment, the driving module further includes a first elastic member disposed on the carrier, the first elastic member engaging with and applying elastic force to an upper portion of the friction plate such that the friction plate is pressed against the friction bar; in one embodiment, the first elastic member is a spring.

In one embodiment, the drive module further comprises a fixing member disposed on the carrier and fixing the friction plate to the carrier.

In one embodiment, the driving module further comprises a mass block, one end of the piezoelectric element is matched with the end face of the friction rod, and the other end of the piezoelectric element is matched with the mass block.

In one embodiment, the driving module further comprises a second elastic member mounted on the carrier and contacting a side surface of the friction bar; in one embodiment, the second elastic member is a snap spring.

In one embodiment, the driving module further comprises a third elastic member, a base embedded metal sheet is arranged in the base, and the third elastic member is mounted on the base and electrically connects the piezoelectric element with the base embedded metal sheet; in one embodiment, the third elastic member is two clamp springs, and the two clamp springs are arranged on two sides of the piezoelectric element.

In one embodiment, the carrier is provided with an optical element mounting hole in the middle, the optical element mounting hole is arranged in a direction parallel to the base, a first ball is further arranged between the carrier and the base, and the first ball and the piezoelectric element are arranged on two sides of the optical element mounting hole.

In one embodiment, a second ball is disposed between the carrier and the frame, the second ball and the piezoelectric element being disposed on both sides of the optical element mounting hole; preferably, the second ball and the first ball are vertically aligned with each other.

In one embodiment, the base is provided with a base ball mounting groove, the bottom of the carrier is provided with a carrier ball driving surface corresponding to the base ball mounting groove, and the upper surface of the carrier is provided with a carrier ball mounting groove, and the frame is provided with a frame ball driving surface engaged with the carrier ball mounting groove.

In one embodiment, the base comprises a plate-shaped main body, a sinking portion is formed on the upper surface of the plate-shaped main body, a base ball mounting portion is arranged on one side of the sinking portion, a driving module mounting portion is arranged on the other side of the sinking portion, and the driving module mounting portion is provided with a piezoelectric element mounting groove and a friction rod mounting hole.

In one embodiment, the driving module mounting portion includes a first protruding portion and a second protruding portion protruding upward from the interior of the sinking portion, the first protruding portion is provided with the piezoelectric element mounting groove, and the friction bar mounting hole includes a friction bar first mounting hole provided on the first protruding portion and a friction bar second mounting hole provided on the second protruding portion, the friction bar first mounting hole and the friction bar second mounting hole are respectively matched with two ends of the friction bar.

In one embodiment, the height of the friction bar first mounting hole is the same as the height of the friction bar second mounting hole.

In one embodiment, a connecting line of the first friction rod mounting hole and the second friction rod mounting hole is parallel to an optical axis.

In one embodiment, the optical element driving device further includes a mass block, the first protrusion further forms a mass block mounting portion to which the mass block is mounted, the mass block mounting portion being disposed adjacent to the piezoelectric element mounting groove and provided with an arc-shaped recess portion that is recessed downward.

In one embodiment, the bottom of the mass mounting groove is lower than the bottom of the piezoelectric element mounting groove.

In one embodiment, a base embedded metal sheet is arranged in the base, base embedded metal sheet connecting parts are arranged on two sides of the piezoelectric element mounting groove, and the base embedded metal sheet connecting parts are integrally formed with the base embedded metal sheet.

In one embodiment, the base ball mounting part is formed to protrude upward from a surface of the depressed part by a certain distance, and an upper surface of the base ball mounting part is provided with a base ball mounting groove.

In one embodiment, the base is further provided with a sensor, and the sensor is arranged behind the base ball mounting part and is communicated with the metal sheet embedded in the base.

In one embodiment, a driving space is formed between the first projection and the second projection, the driving space is engaged with the lower end of the friction plate, and the moving stroke of the carrier is limited in the driving space.

In one embodiment, the frame has a frame body, an open space is formed at the bottom of the frame body to install the carrier, a top opening communicated with the open space is arranged on the upper surface of the frame body, and an upper driving part avoiding groove and a side driving part avoiding groove which are communicated with each other are respectively arranged on the upper part and the side part of the frame body to be matched with the driving part of the carrier.

In one embodiment, the top of the open bottom space is further provided with a frame ball drive surface for engaging a second ball mounted on the carrier, the frame ball drive surface and the side drive relief groove being located on either side of the top opening.

In one embodiment, the top of the open bottom space is integrally formed with a frame ball driving part protruding downward, and the frame ball driving surface is provided on a lower surface of the frame ball driving part.

In one embodiment, the front surface of the frame body is provided with a straight groove arranged on the same side of the top opening as the side driver avoidance groove and extending from the top of the frame body all the way to the bottom of the frame body.

In one embodiment, the top opening extends in the optical axis direction and is adapted to fit with the cylindrical portion main body of the carrier, and the front surface of the frame main body is provided with a front opening and the rear surface is provided with a rear opening to fit with the optical element mounting hole of the carrier.

In one embodiment, the upper surface of the frame main body is further provided with a molding avoiding groove, and the molding avoiding groove and the top driving part avoiding groove are respectively located on two sides of the top opening.

In one embodiment, the left side top part and the right side top part of the bottom open space are respectively provided with an avoiding groove for left side forming and an avoiding groove for right side forming, and the frame ball driving surface is located behind the avoiding groove for left side forming.

In one embodiment, the frame ball driving surface extends in the optical axis direction and extends at a front end to be adjacent to the left molding escape groove.

In one embodiment, the rear surface of the frame body is provided with a projection, which is provided above the rear opening.

In one embodiment, the side driving part avoiding groove cooperates with the first protrusion and the second protrusion on the base to snap the first protrusion and the second protrusion into the side driving part avoiding groove when installed.

In one embodiment, the carrier has a cylindrical body, an optical element mounting hole is provided inside the cylindrical body, the optical element mounting hole extends in the front-rear direction and is used for mounting an optical element, a carrier ball mounting portion and a driving portion are provided on both sides of the cylindrical body, respectively, the driving portion is engaged with the piezoelectric element, and the carrier ball portion is engaged with the ball.

In one embodiment, the upper surface of the carrier ball mounting portion is provided with a carrier ball mounting groove for mounting a second ball, and the lower surface of the carrier ball mounting portion is provided with a carrier ball driving surface for cooperating with a first ball mounted on the base.

In one embodiment, the lower surface of the carrier ball mounting portion is further provided with a sensor magnet mounting groove which is located on one side of the carrier ball driving surface away from the cylindrical main body and is used for mounting a sensor magnet.

In one embodiment, the driving part has a height H extending in a vertical direction and a thickness W extending in a front-rear direction and a length L extending in a left-right direction, and an end surface of the driving part along the length L is provided with a driving module mounting structure to mount the second portion of the driving module.

In one embodiment, the driving module mounting structure includes a friction plate mounting groove including a vertical groove extending in a vertical direction and a horizontal groove extending in a horizontal direction, the horizontal groove being staggered from the vertical groove and forming a cross-shaped groove on an end surface of the driving part along the length L as a whole.

In one embodiment, the optical element driving device further includes a first elastic member, and a first elastic member mounting hole extending along a length direction of the driving portion is further provided at a bottom of the horizontal groove for mounting the first elastic member.

In one embodiment, the optical element driving device further comprises a fixing piece, fixing piece installation parts for installing the fixing piece are further arranged on two sides of the vertical groove, and the fixing piece installation parts are protruding blocks protruding outwards from two sides of the vertical groove integrally.

In one embodiment, the optical element driving device further comprises a second elastic member, a second elastic member mounting portion is provided below the friction plate mounting groove to mount the second elastic member, wherein the lower end of the friction plate mounting groove extends to the second elastic member mounting portion.

In one embodiment, the second elastic member mounting portion is a shaped indentation provided on an end surface of the driving portion and has a lower cut surface and an upper cut surface, the lower cut surface and the upper cut surface being inclined in opposite directions and intersecting.

In one embodiment, the top of the cylindrical body is provided with a top plane to be in the same plane with the upper surface of the frame, and the bottom of the cylindrical body is provided with a bottom plane to be fitted with the base.

The utility model discloses an optical element drive arrangement need not electromagnetic drive technique, stops completely to avoid the electromagnetic interference problem, cancels the auxiliary component that suspension wire, reed etc. are used as and reset simultaneously, has strengthened the reliability of motor.

Drawings

Fig. 1 is an exploded perspective view of an optical element driving apparatus according to an embodiment of the present invention;

fig. 2 is a perspective view of a frame according to an embodiment of the present invention;

FIG. 3 is a top view of the frame of FIG. 2;

FIG. 4 is a bottom view of the frame of FIG. 2;

fig. 5 and 6 are perspective views of a carrier according to an embodiment of the present invention from different perspectives;

fig. 7 is a perspective view of a base according to an embodiment of the present invention;

figure 8 is a perspective view of a friction plate according to one embodiment of the present invention;

fig. 9 is a perspective view of a second elastic member according to an embodiment of the present invention;

fig. 10 is a perspective view of a mount according to an embodiment of the present invention;

fig. 11 is a perspective view of an assembly of a carrier and base assembled together according to an embodiment of the present invention;

FIG. 12 is a cross-sectional view of the assembly of FIG. 11;

FIG. 13 is another cross-sectional view of the assembly of FIG. 11;

fig. 14 is a perspective view of a lens driving apparatus according to an embodiment of the present invention, in which a housing is removed.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation.

An embodiment of the optical element driving device of the present invention will be described below with reference to the drawings. Fig. 1 is an exploded perspective view of an optical element driving apparatus according to an embodiment of the present invention. As shown in fig. 1, the optical element 100 of the present invention generally includes a housing 10, a frame 20, a carrier 30, a base 40, a base embedded metal sheet 50, a driving module 60, and balls 70. The carrier 30 is used for carrying optical elements (not shown) and is movably installed between the frame 20 and the base 10, and the housing 10 encloses the elements such as the frame 20 and the carrier 30 in a space defined by the housing 10 and the base 40. The balls 70 and the driving module 60 are respectively disposed at two sides of the optical element mounting hole of the carrier 30, the driving module 60 is used for driving the carrier 30 to move along the optical axis direction of the optical element, the balls 70 assist the movement of the carrier 30 relative to the base 40 and the frame 20, wherein the balls 70 include a first ball 71 and a second ball 72, the first ball 71 is mounted on the base 40 and is matched with the carrier ball driving surface of the carrier 30, and the second ball 72 is mounted on the carrier 30 and is matched with the frame ball driving surface of the frame 20.

Specifically, the driving module 60 includes a first portion 61 and a second portion 62, the first portion 61 is mounted on the base 40, the second portion 62 is fixedly mounted on the carrier 30, and the first portion 61 and the second portion 62 cooperate to drive the carrier 30 to move along the optical axis direction of the optical element relative to the base 40. Wherein the first part 61 of the drive module 60 comprises a piezo-electric element by means of which the carrier 30 is driven.

With continued reference to fig. 1, the first portion 61 of the drive module 60 further comprises a friction bar 612, a third resilient member 613, and a mass 614. The second portion 62 of the driving module 60 includes a friction plate 621, a first elastic member 622, a fixing member 623, and a second elastic member 624. The carrier 30 is provided with an optical element mounting hole 31 in a direction parallel to the base 10, the extending direction of the optical element mounting hole 31 is defined as a horizontal direction, a direction substantially perpendicular to the horizontal direction is defined as a vertical direction, the position of the housing 10 is defined as an upper direction, and the position of the base is defined as a lower direction. The friction bar 611 is installed on the base 40 along the extending direction of the optical element installation hole 31, the piezoelectric element 611 is installed at the rear end of the friction bar 611 and is in contact fit with the rear end face of the friction bar 611, the side surface of the friction bar 611 is in contact fit with the friction plate 621, the mass block 614 is installed behind the piezoelectric element 611 and is clamped and fixed by the frame 20, the third elastic pieces 613 are installed at the two sides of the piezoelectric element 611 and electrically connect the piezoelectric element 611 with an external circuit, the friction plate 621 is installed at the driving part of the carrier 30 in the vertical direction and is fixed by the fixing piece 623, the first elastic piece 622 is installed at the upper end of the friction plate 621 and applies an outward elastic force to the upper end of the friction plate 621, so that the lower end of the friction plate 621 presses the side surface. The second elastic member 624 is installed at the driving portion of the carrier 30 and contacts with a side surface of the friction bar 612 installed on the base 40, that is, the friction bar 612 is disposed in a space defined by the second elastic member 624 and a friction surface of the friction sheet 621 and is pressed by the second elastic member 624 and the friction sheet 621.

When a high-frequency pulse is applied to the piezoelectric element 611, the deformation of the piezoelectric element 611 is achieved by the pulse. Since the back end of the piezoelectric element 611 is a mass, the deformation of the piezoelectric element 611 will generate a pushing force forward after a pulse with a specific frequency, and the piezoelectric element 611 cannot push the back mass 614 at the frequency, so the force of the deformation will push the friction rod 612 forward, and a slight displacement is generated between the friction plate 621 and the side surface of the friction rod 612, but the friction rod 612 moves due to the high-frequency motion. Since the friction bar 612 is fixed to the carrier 30, the carrier 30 is driven in the optical axis direction by the piezoelectric element 611.

As can be seen from the above description, the optical element driving device of the present invention does not use the electromagnetic driving technology, and completely avoids the problem of electromagnetic interference, and simultaneously cancels the suspension wires, the reeds, etc. as the auxiliary components for resetting, thereby enhancing the reliability of the motor.

The above describes a complete embodiment of the optical element driving apparatus of the present invention. However, it will be understood by those skilled in the art that the essential element of the driving module of the present invention is the piezoelectric element 611, and the driving of the carrier 30 is realized by the piezoelectric element 611. Other components of the drive module are intended to assist in this function. That is, other elements of the driving module may be omitted or replaced, as long as the driving function of the piezoelectric element 611 to the carrier 30 along the optical axis direction can be achieved, which is the inventive concept.

For example, the friction plates 621 of the second portion 62 of the drive module 60 may be directly mounted to the carrier 30 without the use of the fixing member 623 and/or the first elastic member 622 and/or the second elastic member 624. For another example, the mass 614 of the first portion 61 of the driving module 60 is omitted, and the piezoelectric element 621 is directly mounted on the base 40 and a stopper is provided at the rear end, so that the piezoelectric element 621 can only be deformed forward to push the friction bar 612 when deformed. Those skilled in the art will appreciate that there are numerous other variations of the present inventive concept that will not be described in detail herein for the sake of brevity.

The frame 20 of one embodiment of the present invention is described below with reference to fig. 2-4. Fig. 2 is a perspective view of the frame 20, fig. 3 is a top view of the frame 20, and fig. 4 is a bottom view of the frame 20. As shown in fig. 2-4, the frame 20 is designed to achieve the utility model and includes a rectangular block frame body 200. For convenience of description, it is defined that the optical element driving apparatus is assembled such that the direction of the rear frame 20 toward the housing is upward, the direction toward the base is downward, the side where the balls are installed is left, and the side where the driving module is installed is right. The bottom of the frame body 200 forms an open space to mount the carrier 30, and the upper surface 21 of the frame body 200 is provided with a top opening 211 communicating with the open space, the top opening 211 extending in the optical axis direction and serving to fit with the cylindrical portion body of the carrier 30. The front surface 22 of the frame body 200 is provided with a front opening 221 and the rear surface is provided with a rear opening 241 to fit with the optical element mounting hole of the carrier 30. The upper surface 21 of the frame body 200 is further provided with a shaped escape groove 212, and the shaped escape groove 212 is preferably provided at the left side of the top opening 211, i.e., at the side close to the ball 70. The upper surface 21 of the frame body 200 is also provided with a top driving part escape groove 213 to cooperate with the driving part of the carrier 30. The top driving part avoiding groove 213 is arranged along a direction perpendicular to the top opening 211 and communicated with the top opening 211, and the top driving part avoiding groove 213 is arranged on the right side of the top opening 211, namely, on both sides of the top opening 211 separately from the forming avoiding groove 212.

In one embodiment, the top opening 211 is located approximately in the middle of the upper surface of the frame body 200. And the width of the front opening 221 is greater than the width of the top opening 211. The front surface 22 is provided with a straight groove 222, and the straight groove 222 is arranged at the right side of the front opening 221 and extends from the top to the bottom for matching with a corresponding structure inside the shell to play a role in positioning and fixing. The right side surface 23 of the frame body 200 is provided with a side driving part avoiding groove 231, and the side driving part avoiding groove 231 extends in the left-right direction and is communicated with the bottom open space so as to avoid the driving part on the carrier 30 and is matched with the driving module mounting part on the base 40, so that the driving module mounting part on the base 40 is clamped into the side driving part avoiding groove 231. The rear surface 24 of the frame body 200 is provided with a projection 242, and the projection 242 is provided above the rear opening 241.

Fig. 4 shows the structure of the bottom of the frame 200, and as shown in fig. 4, the left top portion 25 and the right top portion 26 of the bottom open space are respectively provided with a left-side molding escape groove 251 and a right-side molding escape groove 261, and a frame ball driving surface 252 is further provided behind the left-side molding escape groove 251, and the frame ball driving surface 252 is engaged with the second ball 72 provided on the carrier 30, so that the second ball 72 can roll on the frame ball driving surface 252, thereby assisting the movement of the carrier 30 relative to the frame 20. As can be seen from fig. 4, the frame ball driving surface 252 extends in the optical axis (front-rear) direction and extends at the front end to be adjacent to the left molding escape groove 251. Referring back to fig. 2, a frame ball driving part 253 protruding downward is provided at the top of the left side of the open bottom space, and the lower surface of the frame ball driving part 253 is a frame ball driving surface 252.

The carrier 30 according to an embodiment of the present invention is described below with reference to fig. 5 and 6, wherein fig. 5 and 6 are perspective views of the carrier 30 from different viewing angles, respectively. As shown in fig. 5 and 6, the carrier 30 has a cylindrical body 300, and the cylindrical body 300 is provided inside with an optical element mounting hole 31, the optical element mounting hole 31 extending in the front-rear direction and being used for mounting an optical element such as a lens. The top of the cylindrical body 300 is provided with a top plane 34 to be in the same plane as the upper surface of the frame 20. The bottom of the cylinder body 300 is provided with a bottom plane 35 to be engaged with the base 40. Both sides of the cylindrical body 300 are provided with carrier ball mounting parts 32 and driving parts 33, and the carrier ball mounting parts 32 and the driving parts 33 are integrally formed to protrude outward from both sides of the cylindrical body 300 and are engaged with corresponding structures of the base 40 and the frame 20.

Specifically, the upper surface of the carrier ball mounting portion 32 is provided with a carrier ball mounting groove 321, and the carrier ball mounting groove 321 is used for disposing the second ball 72 and is engaged with the frame ball driving surface 252 on the frame 20 so that the second ball can move on the frame ball driving surface 252. The lower surface of the carrier ball mounting portion 32 is provided with a carrier ball driving surface 322 and a sensor magnet mounting groove 323, and the sensor magnet mounting groove 323 is located outside the carrier ball driving surface 322 and is used to mount a sensor magnet to be fitted with a sensor provided on the base 40. In one embodiment, the carrier ball mounting groove 321 is disposed at the front of the upper surface of the carrier ball mounting part 32.

The driving part 33 has a height H extending in the vertical direction and a thickness W extending in the front-rear direction and a length L extending in the left-right direction, wherein the length L and the height H are significantly greater than the thickness W. The driving module mounting structure is mainly provided at an end surface of the driving portion 33 along the length L, and is used to mount the second portion 62 of the driving module 60. Specifically, the drive module mounting structure includes a friction plate mounting groove 331 provided on the end surface of the drive portion 33, the friction plate mounting groove 331 including a vertical groove 3311 extending in the vertical direction and a horizontal groove 3312 extending in the horizontal direction, the horizontal groove 3112 being staggered with the vertical groove 3311 and forming a cross-shaped groove as a whole, wherein the horizontal groove 3312 is provided at a position on the upper side of the middle portion of the vertical groove 3311. An elastic member mounting hole 332 extending in the length direction (i.e., the left-right direction) of the driving portion 33 is further formed in the bottom of the horizontal groove 3312, fixing member mounting portions 333 are further formed on both sides of the vertical groove 3311, the first elastic member 622 is mounted in the elastic member mounting hole 332, the friction plate 621 is mounted in the friction plate mounting groove 331 and abuts against the first elastic member 622 at the upper end thereof, the fixing member 623 is mounted on the fixing member mounting portion 333 and fixes the friction plate 621, and since the first elastic member 622 applies an elastic force to the upper end of the friction plate 621, the lower end of the friction plate 622 abuts against the inner side, and a lever structure is integrally formed. An elastic member mounting portion 334 is provided below the friction plate mounting groove 331, and a second elastic member 624 is mounted on the elastic member mounting portion 334.

The elastic member mounting part 334 is a shaped indentation provided on the end surface of the driving part 33 and has an undercut surface 3341 and an upper tangent surface 3342, the undercut surface 3341 being inclined to the upper left, and the upper tangent surface 3342 being inclined to the upper right and intersecting the undercut surface 3341. The lower end of the friction plate 621 extends outside the cutout of the elastic member mounting portion 334, the friction bar 612 of the first portion 61 of the drive module 60 extends into the cutout of the elastic member mounting portion 334 and contacts the friction plate 621 on the right side surface, and the right side surface contacts the second elastic member 624 and is pressed by the second elastic member 624. When the friction bar 612 moves forward by the driving of the piezoelectric element 611, the friction plate 621 is pushed forward by the contact of the right side surface with the friction plate 621, and the carrier 30 is driven to move in the optical axis direction with respect to the base 40 and the frame 20.

The base of an embodiment of the present invention is described below with reference to fig. 7. Fig. 7 is a perspective view of the base 40. As shown in fig. 7, the base 40 integrally includes a plate-shaped body 400, a sunken portion 41 is formed on the upper surface of the plate-shaped body 400, the sunken portion 41 occupies most of the upper surface of the plate-shaped body 400, and a blocking portion 45 is formed around the sunken portion 45, and the blocking portion 45 limits the frame 20 in the area where the sunken portion 41 is located.

Specifically, the left side of portion 41 that sinks is equipped with base ball installation department 42, base ball installation department 42 upwards protrudes from portion 41 that sinks and forms and be used for cooperating with the carrier ball driving surface of carrier 30, the upper surface of base ball installation department 42 is equipped with base ball mounting groove 421, first ball 71 install in base ball mounting groove 421 and with carrier ball driving surface cooperation on the carrier 30, when drive module 60 drive carrier 30 moves, carrier 30 moves through the motion auxiliary carrier 30 of first ball, reduce the movement resistance, make the motion more steady.

The right side of the depressed portion 41 is provided with a base driving module mounting portion 43 to mount a first portion 61 of the driving module 60. Specifically, the drive module mounting portion 43 includes a first projecting portion 431 and a second projecting portion 432 projecting upward, the first projecting portion 431 being located forward of the second projecting portion 432 and being disposed adjacent to the front surface of the base 40. The first protrusion 431 is provided with a piezoelectric element mounting groove 4311 opened upward to mount the piezoelectric element 611, a mass mounting portion 4312 is provided behind the piezoelectric element mounting groove 431, and the bottom of the mass mounting portion 4312 is provided in an arc shape to be fitted with a mass of a disk-shaped ground. Preferably, the mass mounting portion 4312 is configured as a semicircular groove. As can be seen from fig. 7, the bottom of the mass mounting section 4312 is lower than the bottom of the piezoelectric element mounting groove 4311. The first protruding portion 431 is further provided with a first friction bar mounting hole 4313, the first friction bar mounting hole 4313 is disposed on the side wall of the piezoelectric element mounting groove 4311, correspondingly, the second protruding portion 432 is provided with a second friction bar mounting hole 4321, and the height of the second friction bar mounting hole 4321 is the same as that of the first friction bar mounting hole 4313 and is parallel to the optical axis direction with the connection line of the first friction bar mounting hole 4313.

The first and second protrusions 431 and 432 form a driving space 433 therebetween. When the carrier 30 is mounted on the base plate 40, the lower ends of the friction plates 621 on the carrier 30 are located in the driving space 433 and are in contact engagement with the portions of the friction bars 612 located between the first protrusions 431 and the second protrusions 432. Base embedded metal sheet connecting portions 51 are provided on both sides of the piezoelectric element mounting groove 4311, the base embedded metal sheet connecting portions 51 are integrally formed with the base embedded metal sheet 50, the third elastic members 613 are preferably provided as a pair of snap springs and provided on both sides of the piezoelectric element 611, and the base embedded metal sheet connecting portions 51 electrically connect the base embedded metal sheet 50 with the piezoelectric element 611. One end of the friction bar 612 rotatably penetrates the friction bar first mounting hole 4313 and is in contact fit with the piezoelectric element 611, and the other end of the friction bar 612 rotatably penetrates the friction bar second mounting hole 4321 and is relatively fixed by the friction bar first mounting hole 4313 and the friction bar second mounting hole 4321, so that the friction bar can only rotate.

With continued reference to fig. 7, a sensor 44 is further provided in the depressed portion 41 of the base 40, and the sensor 44 corresponds to a sensor magnet mounted in a sensor magnet mounting groove 323 on the bottom surface of the carrier ball mounting portion 32 of the carrier 30. In one embodiment, the sensor 44 is disposed behind the base ball mounting portion 42 and communicates with the base insert sheet metal 50, thereby connecting with an external circuit through the base insert sheet metal 50 and transmitting a sensing signal to a control unit (not shown). When the carrier 30 moves relative to the base 40, the sensor 44 detects the displacement of the carrier 30 by sensing the position of the sensor magnet, and transmits the displacement information to the control unit.

Fig. 8 is a perspective view of a friction plate 621 according to an embodiment of the present invention. As shown in fig. 8, the upper portion of the friction plate forms a cross-shaped structure and includes horizontal portions 6211 and vertical portions 6212, the horizontal portions 6211 and the vertical portions 6212 being staggered and respectively engaged with the horizontal grooves 3112 and the vertical grooves 3311 of the carrier 30. Preferably, the horizontal portion 6211 and the vertical portion 6212 are integrally formed. The friction plate 621 has a lower portion formed with a friction portion 6213, the friction portion 6213 being provided at the bottom of the vertical portion 6212 and having a width substantially similar to that of the horizontal portion 6211, the friction portion 6213 being engaged with the driving space 433 of the base 40. The friction member 533 is formed integrally in an arc-shaped configuration and includes a concave surface 6214, and the concave surface 6214 is a frictional surface and engages with a side surface of the friction bar 6212. When the friction sheet 621 is mounted on the carrier 30, the first elastic member 622 is located at a portion where the horizontal portion 6211 and the vertical portion 6212 overlap, and applies an outward elastic force to the upper end of the friction sheet 621, so that the friction portion 6213 abuts inward (i.e., abuts toward the friction bar).

Fig. 9 is a perspective view of the second elastic member 624 according to an embodiment of the present invention. As shown in fig. 9, the second resilient member 624 includes a first portion 6241 and a second portion 6242 formed integrally, the first portion 6241 cooperating with a lower cut-out surface 3341 on the carrier 30, the second portion 6242 cooperating with an upper cut-out surface 3342 on the carrier 30, and the friction bar 612 being located in a space surrounded by the first portion 6241, the second portion 6242, and the friction surface 6214 of the friction plate 6213.

Fig. 10 is a perspective view of a fixing member 623 according to an embodiment of the present invention. As shown in fig. 10, the anchor 623 has a central portion 6231 and side portions 6232 protruding from both sides of the central portion 6231 in a direction perpendicular to the central portion 6231, the side portions 6232 being provided with snap holes 6233, the snap holes 6233 being engaged with the anchor mounting portions 333 on the carrier 30, thereby fixing the friction plate 621 to the carrier 30.

A process diagram for assembling the base 40 and the carrier 30 is described below in conjunction with fig. 11-13. In which fig. 11 is a perspective view of an assembly in which the carrier 30 is assembled with the base 40, fig. 12 is a sectional view of the assembly of fig. 11, and fig. 13 is another sectional view of the assembly of fig. 11. As shown in fig. 11-13, the carrier 30 is mounted on the base 40 with the carrier ball mount 32 on the left side of the carrier 30 in aligned engagement with the base ball mount 42 on the base 40. As best seen in fig. 12, the first balls 71 are disposed in the base ball mounting slots 421 and engage the carrier ball drive surfaces 322 of the carrier 30, while the second balls 72 are disposed in the carrier ball mounting slots 321 and are adapted to engage the frame ball drive surfaces on the frame 20. The driving part 33 on the right side of the carrier 30 is located entirely within a driving space 433 defined by the first and second protrusions 431 and 432 on the base 40. Wherein the thickness W of the driving portion 33 of the carrier 30 extending in the front-rear direction is smaller than the driving space 433 so that the carrier 30 can move within the range of the driving space 433 at the maximum with respect to the base 40.

With continued reference to fig. 11 to 13, both ends of the friction bar 612 of the first portion 61 of the driving module 60 respectively protrude into the friction bar first mounting hole 4313 of the first protrusion 431 and the friction bar second mounting hole 4321 of the second protrusion 432 of the base 40, the piezoelectric element 611 is mounted in the piezoelectric element mounting groove 4311 of the base 40 to be engaged with the rear end surface of the friction bar 612, the mass 614 is disposed in the mass mounting portion 4312 and presses the piezoelectric element 611, and the third elastic members 613 are mounted on both sides of the piezoelectric element 611 and communicate with the base embedded metal sheet, thereby electrically connecting the piezoelectric element 611 with an external circuit.

The first elastic member 622 of the second portion 62 of the driving module 60 is installed in the elastic member installation hole 332 of the carrier 30, and the friction plate 621 is installed in the friction plate installation groove 331 of the carrier 30 and presses the first elastic member 622, wherein the horizontal portion 6211 of the friction plate 621 is disposed in the horizontal groove 3312, the vertical portion 6212 is disposed in the vertical groove 3311, and the friction portion 6213 is protruded into the driving space 433 of the base 40 and makes the friction surface 6214 thereof contact-engaged with the side surface of the friction bar 612. The fixing member 623 is caught to the fixing member mounting part 333 and fixes the friction plate 621 to the carrier 30, and the second elastic member 624 is mounted to the elastic member mounting part 334 of the carrier 30 and surrounds the friction bar 612 from the left side.

Fig. 14 is a perspective view of the lens driving device 100 according to an embodiment of the present invention, in which the housing is removed. As shown in fig. 14, the frame 20 is mounted in the depressed portion 41 of the base 40 and protects the carrier 30. Wherein the top opening 211 is engaged with the cylindrical portion of the carrier 30, the driving portion escape groove 213 is engaged with the driving portion 33 of the carrier 30, and the side driving portion escape groove 231 is engaged with the driving module mounting portion 43 on the base 40. The width of the side driving part escape groove 231 is slightly larger than the distance between the first and second protrusions 431 and 432 on the base 40, and is fixed just at the front and rear sides of the first and second protrusions 431 and 432. As is also clear from fig. 14, the frame 20 is confined within the base depression 41 by the stop 45 of the base 40.

When a high-frequency pulse is applied to the piezoelectric element 611 through the metal sheet 50 embedded in the base, the high-frequency pulse realizes the deformation of the piezoelectric element 611, and as can be seen from the figure, because the mass block 614 is arranged behind the piezoelectric element 611, the piezoelectric element 611 deforms to generate a thrust force after the pulse with a specific frequency, and the piezoelectric element 611 cannot push the rear mass block 614 under the frequency, the force of the deformation pushes the friction rod 612 forward, so that a slight displacement is generated between the friction plate 621 and the friction rod 612, the carrier 30 moves along the optical axis direction due to the displacement with the high frequency, and the carrier can be driven backwards along the optical axis direction due to the specific frequency during resetting.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims (19)

1. An optical element driving apparatus, comprising a frame, a carrier, a base, and a driving module, wherein the carrier is used for carrying an optical element and is movably installed between the frame and the base, the driving module drives the carrier to move along an optical axis direction of the optical element relative to the base, and the optical element driving module includes a piezoelectric element disposed on the base, and the carrier is driven by the piezoelectric element.

2. An optical element driving device as claimed in claim 1, wherein the optical element driving module further comprises a friction member movably mounted on the base and cooperating with the piezoelectric element, and the piezoelectric element drives the friction member to move and drives the carrier to move through the friction member.

3. The optical element driving device according to claim 2, wherein the optical element driving module further comprises a friction plate disposed on the carrier, the friction plate is engaged with a friction member disposed on the base, and the friction plate is driven to move by the movement of the friction member so as to drive the carrier to move.

4. The optical element driving device according to claim 3, wherein said friction plate is arranged in a direction perpendicular to the optical axis, and said friction member is arranged in a direction parallel to the optical axis.

5. An optical element driving device according to claim 4, wherein said friction member is a friction bar, said piezoelectric element is engaged with an end surface of said friction bar, and said friction plate is engaged with a side surface of said friction bar.

6. The optical element driving device according to claim 5, wherein the upper portion of the friction plate is formed in a cross-shaped configuration and includes horizontal portions and vertical portions which are alternately arranged, and the lower portion of the friction plate is formed in a friction portion which is formed in an arc-shaped configuration and has a concave surface which is a friction surface to be engaged with a side surface of the friction bar.

7. The optical element driving device according to claim 6, wherein the horizontal portion and the vertical portion are integrally formed.

8. The optical element driving apparatus as claimed in claim 6, wherein said driving module further comprises a first elastic member provided on said carrier, said first elastic member engaging with an upper portion of said friction plate and applying an elastic force to the upper portion of said friction plate so that said friction plate is pressed against said friction bar.

9. An optical element driving device according to claim 8, wherein said first elastic member is a spring.

10. The optical element driving device according to claim 5, wherein the driving module further comprises a fixing member disposed on the carrier and fixing the friction plate to the carrier.

11. An optical element driving device according to claim 5, wherein said driving module further comprises a mass block, one end of said piezoelectric element is fitted to an end face of said friction rod, and the other end of said piezoelectric element is fitted to said mass block.

12. An optical element driving apparatus according to claim 5, wherein said driving module further comprises a second elastic member mounted on said carrier and contacting a side surface of said friction bar.

13. The optical element driving apparatus as claimed in claim 12, wherein the second elastic member is a circlip.

14. An optical element driving apparatus according to claim 1, wherein the driving module further comprises a third elastic member, a base embedded metal sheet is provided in the base, and the third elastic member is mounted on the base and electrically connects the piezoelectric element and the base embedded metal sheet.

15. The optical element driving device according to claim 14, wherein the third elastic member is two snap springs, and the two snap springs are disposed on both sides of the piezoelectric element.

16. The optical element driving device according to claim 1, wherein an optical element mounting hole is provided in a central portion of the carrier, the optical element mounting hole being provided in a direction parallel to the base, and a first ball is further provided between the carrier and the base, the first ball and the piezoelectric element being disposed on both sides of the optical element mounting hole.

17. The optical element driving device according to claim 16, wherein a second ball is provided between the carrier and the frame, the second ball and the piezoelectric element being arranged on both sides of the optical element mounting hole.

18. An optical element driving apparatus according to claim 17, wherein said second ball and said first ball are vertically aligned with each other.

19. An optical element driving device according to claim 17, wherein the base is provided with a base ball mounting groove, the bottom of the carrier is provided with a carrier ball driving surface corresponding to the base ball mounting groove, and the upper surface of the carrier is provided with a carrier ball mounting groove, and the frame is provided with a frame ball driving surface engaged with the carrier ball mounting groove.

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