CN214669808U

CN214669808U - Lens driving device

Info

Publication number: CN214669808U
Application number: CN202120801547.7U
Authority: CN
Inventors: 张峰; 秦重阳; 肖应; 冯先文
Original assignee: SAE Magnetics HK Ltd
Current assignee: SAE Magnetics HK Ltd
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2021-11-09
Anticipated expiration: 2031-04-19

Abstract

The utility model relates to a technical field that makes a video recording especially relates to a camera lens drive arrangement, include: an autofocus assembly comprising a support base; the optical anti-shake component comprises an installation base, a support base and a guide mechanism, wherein the support base is arranged on the installation base, the guide mechanism is arranged between the installation base and the support base and comprises a guide piece and a guide part arranged on the installation base, and the guide piece is movably arranged on the guide part; and a driver connected with the guide. The utility model discloses a set up guiding mechanism between auto focus subassembly and optics anti-shake subassembly, make auto focus subassembly and optics anti-shake subassembly accessible guiding mechanism freely remove along the direction of perpendicular camera lens optical axis to improve auto focus subassembly and optics anti-shake subassembly support relative movement's stability, and help promoting the stroke amplification function that the camera lens realized optics anti-shake.

Description

Lens driving device

Technical Field

The utility model relates to a technical field that makes a video recording especially relates to a camera lens drive arrangement.

Background

In a mobile device, a camera module for taking pictures or recording videos is generally provided. The camera module includes a lens (optical lens group) in addition to a photosensitive element for light sensing. In the process of moving the lens along the direction vertical to the optical axis of the lens in the prior art, the moving action and direction stability of the lens are poor, so that the product performance is unstable.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a camera lens drive arrangement helps improving the camera lens and is moving action and the directional stability of in-process along perpendicular camera lens optical axis direction, improves and produces property ability.

In order to achieve the above object, the present invention provides a lens driving device, including:

an auto focus assembly including a support base for mounting a lens;

the optical anti-shake assembly comprises an installation base, wherein the supporting base is arranged on the installation base, a guide mechanism is arranged between the installation base and the supporting base, the guide mechanism comprises a guide piece and a guide part which is arranged on the installation base and used for guiding the automatic focusing assembly to freely move along the direction vertical to the optical axis of the lens, and the guide piece is movably arranged on the guide part;

a driver connected with the guide.

Further preferably, the guiding mechanism further comprises a positioning groove, the positioning groove is formed in the supporting base facing a side face of the mounting base, and the guiding piece is embedded in the positioning groove and can move in the direction perpendicular to the optical axis of the lens.

Preferably, the guide part is a guide protrusion arranged on the mounting base facing one side of the support base, and the guide part is arranged on the guide protrusion and can move along the extension direction of the guide protrusion.

Further preferably, the guide mechanisms are arranged in parallel on the left side and the right side of the installation base, which are perpendicular to the same direction of the optical axis of the lens, respectively.

Further preferably, the guide mechanisms are disposed on the mounting base in four directions perpendicular to the optical axis of the lens.

Further preferably, the guide is a ball.

Further preferably, the actuator is the SMA actuator, and it includes elasticity actuating arm and SMA line, the elasticity actuating arm include stiff end, link and with be connected the elasticity portion of stiff end and link, the stiff end with guide fixed connection, the link pass through flexible hinged joint in the installation base. SMA wire connection the stiff end, SMA wire is heated the shrink pulling the stiff end is followed lens optical axis direction motion is kept away from to the guide part, simultaneously the elastic component has the drive the stiff end is followed the guide part is close to the power of lens optical axis direction motion.

Further preferably, the driver comprises two elastic driving arms which are symmetrically arranged, two ends of the SMA wire are respectively connected to fixed ends of the two elastic driving arms, and the fixed ends of the two elastic driving arms are connected with the guide mechanism.

Preferably, the automatic focusing device further comprises a swinging support piece fixed on the mounting base, the swinging support piece is provided with an elastic support part extending along the optical axis direction of the lens, and the automatic focusing assembly is placed on the elastic support part.

Further preferably, the mounting base further comprises a circuit board fixed on the lower surface of the mounting base through a surface mounting process, the circuit board is provided with a plurality of wiring holes, and a position sensor is arranged between the circuit board and the mounting base.

Implement the utility model discloses an embodiment has following technological effect:

the utility model discloses a set up guiding mechanism between auto focus subassembly and optics anti-shake subassembly, make auto focus subassembly and optics anti-shake subassembly accessible guiding mechanism freely remove along the direction of perpendicular camera lens optical axis, thereby improve the stability of auto focus subassembly and optics anti-shake subassembly support relative movement, and make the auto focus subassembly laminate through guiding mechanism and optics anti-shake subassembly each other through the dead weight of auto focus subassembly and the camera lens of loading on the auto focus subassembly, further improve optics anti-shake subassembly and auto focus subassembly relative motion's stability, and help promoting the camera lens and realize the stroke amplification function of optics anti-shake.

Drawings

Fig. 1 is an exploded view of a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of the autofocus assembly of the embodiment of FIG. 1;

FIG. 3 is an exploded view of the auto focus assembly of FIG. 2;

FIG. 4 is an exploded view of a portion of the structure of the embodiment shown in FIG. 1;

FIG. 5 is an enlarged schematic view at A in FIG. 4;

FIG. 6 is a schematic diagram of the structure of the actuator in the embodiment of FIG. 1;

figure 7 is a schematic view of the construction of the resilient drive arm of the embodiment of figure 6;

FIG. 8 is a schematic structural view of the flexible hinge in the embodiment of FIG. 6;

fig. 9 is a schematic structural diagram of a circuit board in the embodiment shown in fig. 1.

Description of reference numerals:

100. a housing;

200. an automatic focusing assembly 210, a guide mechanism 211, a first guide groove 212, a second guide groove 213, a guide ball 220, a lens carrier 230, a support base 240, a magnetic conductive sheet 250, a magnetic piece 260 and an axial SMA driver;

300. an optical anti-shake component 310, an installation base 321, a guide piece 322, a guide part 323 and a positioning groove;

400. the flexible hinge comprises a driver 410, an elastic driving arm 411, a fixed end 412, a connecting end 413, an elastic part 414, a flexible hinge 415, an arc-shaped contact surface 416, a first bulge 418, a second plane 419, a bending plane 420 and an SMA wire;

500. an L-shaped flexible circuit;

600. a swing support 610, an elastic support;

700. circuit board, 710, wire hole, 720, position sensor.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In addition, the terms "first", "second", and the like are used in the present invention to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

Referring to fig. 1 to 9, in the present embodiment, the present application provides a lens driving apparatus, including a housing 100, an auto-focusing assembly 200, an optical anti-shake assembly 300, a driver 400, and an L-shaped flexible circuit 500 for connecting the auto-focusing assembly 200 and the optical anti-shake assembly 300, which solves the problem of connecting the auto-focusing assembly 200 and the optical anti-shake assembly 300, and adopts the L-shaped flexible circuit 500, so that the auto-focusing assembly 200 and the optical anti-shake assembly 300 can be flexibly deformed when moving relatively, the circuit connection is ensured, and the movement of the auto-focusing assembly 200 is not affected, and the process and the structure are simple, thereby reducing the cost.

Referring to fig. 2 and 3, the auto-focusing assembly 200 includes a guiding mechanism 210, a lens carrier 220 and a supporting base 230, the guiding mechanism 210 is disposed between the lens carrier 220 and the supporting base 230, so that the lens carrier 220 can move reliably and stably along the optical axis direction thereof with respect to the supporting base 230, and an axial driving assembly is disposed on the supporting base 230 and connected to the lens carrier 220 for driving the lens carrier 220 to move along the optical axis direction thereof;

further, referring to fig. 2 and 4, the optical anti-shake assembly 300 in this embodiment includes a mounting base 310, a supporting base 230 disposed on the mounting base 310, and a guiding mechanism disposed between the mounting base 310 and the supporting base 230, the guiding mechanism including a guiding member 321 and a guiding portion 322 disposed on the mounting base 310 for guiding the auto-focusing assembly 200 to move freely along a direction perpendicular to the optical axis of the lens, the guiding member 321 being movably disposed on the guiding portion 322;

a driver 400 connected to the guide 321 for driving the auto-focusing assembly 200 to move in a direction perpendicular to the optical axis;

housing 100 is mounted to mounting base 310 and autofocus assembly 200 is housed within housing 100.

Therefore, on one hand, the automatic focusing assembly 200 can freely move along the direction vertical to the optical axis of the lens by arranging the guide mechanism, and meanwhile, the stability and the reliability of the automatic focusing assembly 200 moving along the direction vertical to the optical axis are improved by the guide mechanism, so that the problems of movement inclination, poor moving performance and the like in the moving process are avoided; on the other hand, the driver 400 is arranged to drive the guide member 321 to move, and the guide member 321 drives the automatic focusing assembly 200 to move along the direction perpendicular to the optical axis, so as to achieve optical anti-shake of the lens in the direction perpendicular to the optical axis.

Specifically, the guide mechanism 210 in this embodiment includes a first guide groove 211 provided in the lens carrier 220 and extending in the lens optical axis direction, a second guide groove 212 provided in the support base 230 and extending in the lens optical axis direction, and a plurality of guide balls 213 provided between the first guide groove 211 and the second guide groove 212, and the cross sections of the first guide groove 211 and the second guide groove 212 are both arc-shaped to be in surface contact with the guide balls 213.

Further, referring to fig. 3, the supporting base 230 is provided with a magnetic conductive sheet 240, at least one peripheral side of the lens carrier 220 is provided with a magnetic member 250, and the lens carrier 220 and the supporting base 230 are attached to each other through the guiding mechanism 210 by the mutual attraction between the magnetic conductive sheet 240 and the magnetic member 250, so as to improve the stability of the lens carrier 220 moving along the lens optical axis direction.

An axial SMA (shape memory alloy) actuator 260 is further installed on the support base 230, and the lens carrier 220 is driven by the axial SMA actuator 260 to move along the optical axis direction of the lens, which is beneficial to increasing the driving force and the driving stroke of the lens carrier.

Further, referring to fig. 2, in order to improve the stability of the auto-focusing assembly 200 moving along the direction perpendicular to the optical axis, the guiding mechanism in this embodiment further includes a positioning groove 323, the positioning groove 323 is disposed on a side surface of the supporting base 230 facing the mounting base 310, and the guiding element 321 is embedded in the positioning groove 323 and can move along the direction perpendicular to the optical axis of the lens, so that when the driver 400 drives the guiding element 321 to move, the guiding element 321 can drive the auto-focusing assembly 200 to move along the direction perpendicular to the optical axis due to the limitation of the positioning groove 323.

Referring to fig. 4 and 5, the guide portion 322 in this embodiment is a guide protrusion disposed on a side surface of the mounting base 310 facing the supporting base 230, the guide member 321 is disposed on the guide protrusion and can move along an extending direction of the guide protrusion, and the guide protrusion cooperates with the positioning groove 323 to improve the moving stability of the guide member 321.

Further, referring to fig. 4, in order to improve the stability of both sides when the auto-focus assembly 200 moves, guide mechanisms are disposed in parallel on the left and right sides of the mounting base 310 in the same direction perpendicular to the optical axis of the lens.

In addition, the four directions perpendicular to the lens optical axis on the mounting base 310 are provided with guide mechanisms, specifically, the four directions perpendicular to the lens optical axis are four directions of an X axis and a Y axis, so that the driver 400 pushes the guide 321 to drive the automatic focusing assembly 200 to realize an X, Y-direction anti-shake function, wherein the lens optical axis direction is a Z axis.

Specifically, the guide member 321 in this embodiment is a ball, so that the guide member 321 forms an arc-shaped surface in each direction, and the guide member 321 is smoother in the moving process, thereby reducing friction generated between the guide member 321 and the supporting base 230 and the mounting base 310 when moving, reducing dust particles generated by friction, and improving the driving performance of the driver 400.

In another embodiment, the guide 321 may be a cylinder, and the friction force of movement is reduced by the contact of the outer circumferential surface of the cylinder with the mounting base 310 and the support base 230.

Further, referring to fig. 4 and 6, in order to improve the driving force of the driving and achieve the stroke amplification function, the actuator 400 in one embodiment of the present application is an SMA actuator, which includes an elastic driving arm 410 and an SMA wire 420, the elastic driving arm 410 includes a fixed end 411, a connection end 412, and an elastic portion 413 connecting the fixed end 411 and the connection end 412, the fixed end 411 is fixedly connected to the guide member 321, and the connection end 412 is connected to the mounting base 310 through a flexible hinge 414. SMA wire 420 connects stiff end 411, SMA wire 420 is heated to shrink and pulls stiff end 411 to keep away from lens optical axis direction motion along guide 322, elastic component 413 has the power that drives stiff end 411 to be close to lens optical axis direction motion along guide 322 simultaneously, this embodiment adopts SMA wire 420 to be heated to shrink the drive, possesses great drive power, can promote the bigger camera lens of weight and remove, realizes the stroke amplification function, and produce corresponding elasticity through elasticity actuating arm 410 and reset.

Referring to fig. 6-8, the actuator 400 of the present embodiment includes two elastic actuating arms 410 symmetrically arranged, two ends of the SMA wire 420 are respectively connected to fixed ends 411 of the two elastic actuating arms 410, and the fixed ends 411 of the two elastic actuating arms 410 are both connected to a guiding mechanism, so as to further achieve stability and reliability of the actuating performance.

Further, the fixed end 411 in this embodiment is formed with an arc contact surface 415, and the arc contact surface 415 is matched with the outer peripheral surface of the ball, so that the contact area between the fixed end 411 and the ball is increased, and the fixed ends are fixed more firmly;

in addition, the connecting end 412 is provided with a first protrusion 416, the first protrusion 416 forms a first plane, the flexible hinge 414 is provided with a bending plane 419 and a second plane 418 attached to the first plane, wherein an included angle is formed between the bending plane 419 and the second plane 418.

Further, referring to fig. 4, the lens driving apparatus of the present embodiment further includes a swing supporting member 600 fixed on the mounting base 310, the swing supporting member 600 is provided with an elastic supporting portion 610 extending along the optical axis direction of the lens, the auto-focusing assembly 200 is placed on the elastic supporting portion 610, and the contact pressure between the auto-focusing assembly 200 and the guiding member 321 is reduced, so that the friction force received by the auto-focusing assembly 200 when moving along the X-axis and the Y-axis is small, and the optical anti-shake function is realized by matching with the driver 400.

Specifically, the elastic support portion 610 is formed by bending a metal wire perpendicular to the XY plane in the Z direction, the structure is more compact and reasonable, and the rigidity of the optical anti-shake in the XY direction is reduced, so that the K value requirement is met more easily.

Referring to fig. 9, the optical lens module further includes a circuit board 700 fixed on the lower surface of the mounting base 310 through a surface mounting process, the circuit board 700 is provided with a plurality of wire holes 710 for facilitating wire routing and saving space, and a position sensor 720 is disposed between the circuit board 700 and the mounting base 310 for sensing the magnetic field intensity variation perpendicular to the optical axis direction (XY direction) of the lens during lens shake and obtaining displacement data after calculation by the IC chip.

In summary, the present application is provided with the guiding mechanism 210 and the guiding mechanism, so that the lens carrier 220 can stably and reliably move in the Z-axis direction and the auto-focus assembly 200 in the X, Y direction, thereby avoiding the problems of tilting and poor movement in the moving process, and meanwhile, the L-shaped flexible circuit 500 is connected to the auto-focus assembly 200 and the mounting base 310, thereby achieving the electrical conduction function and realizing the overall layout fixation and reinforcement; in addition, the driver 400 is driven by the SMA wire 420, has a larger driving force, can push a lens with larger weight to move, and realizes the function of stroke amplification, and meanwhile, the bottom of the mounting base 310 adopts a surface mounting process to fix the circuit board 700 and is provided with the position sensor 720, so that the product performance and the control precision are improved, the cost is reduced, and the market demand is met.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A lens driving apparatus, comprising:

an auto focus assembly including a support base for mounting a lens;

a driver connected with the guide.

2. The lens driving apparatus according to claim 1, wherein the guide mechanism further comprises a positioning groove provided in a side surface of the support base facing the mount base, and the guide member is fitted in the positioning groove and is movable in a direction perpendicular to an optical axis of the lens.

3. A lens driving apparatus according to claim 1, wherein the guide portion is a guide projection provided on a side of the mount base facing the support base, and the guide member is provided on the guide projection and is movable in a direction in which the guide projection extends.

4. A lens driving apparatus according to claim 1, wherein said guide mechanism is disposed in parallel on both left and right sides of said mount base in the same direction perpendicular to the optical axis of the lens.

5. The lens driving device according to claim 1, wherein said guide mechanism is disposed on said mount base in four directions perpendicular to an optical axis of the lens.

6. A lens driving apparatus according to any one of claims 1 to 5, wherein the guide is a ball.

7. A lens driving device as claimed in any one of claims 1 to 5, wherein the actuator is an SMA actuator including an elastic actuating arm and an SMA wire, the elastic actuating arm includes a fixed end, a connecting end and an elastic portion connected to the fixed end and the connecting end, the fixed end is fixedly connected to the guiding member, the connecting end is connected to the mounting base through a flexible hinge, the SMA wire is connected to the fixed end, the SMA wire is pulled by thermal contraction of the fixed end along the direction of the guiding portion away from the lens optical axis, and the elastic portion has a force for driving the fixed end along the direction of the guiding portion near the lens optical axis.

8. A lens driving device as claimed in claim 7, wherein the actuator comprises two elastic driving arms symmetrically arranged, two ends of the SMA wire are respectively connected to fixed ends of the two elastic driving arms, and the fixed ends of the two elastic driving arms are both connected to the guiding mechanism.

9. The lens driving apparatus according to any one of claims 1 to 5, further comprising a swing support fixed to the mount base, the swing support being provided with an elastic support portion extending in a direction of an optical axis of the lens, the auto-focus assembly being placed on the elastic support portion.

10. The lens driving device as claimed in claim 1, further comprising a circuit board fixed to the lower surface of the mounting base by a surface mount process, wherein the circuit board is provided with a plurality of wiring holes, and a position sensor is disposed between the circuit board and the mounting base.