Lens driving device

Abstract

The lens driving device comprises a fixed support, an anti-shake support and an elastic supporting piece which is connected with the fixed support and the anti-shake support and can support the anti-shake support to move relative to the fixed support, the elastic supporting piece comprises a metal supporting piece and a flexible circuit board, and the metal supporting piece comprises four first elastic arms. Each first elastic arm comprises a first part and a fourth part which extend along the direction of an optical axis of a lens in the device, a second part which extends along a first direction perpendicular to the optical axis, and a third part which extends along a second direction perpendicular to the optical axis and the first direction, and the flexible circuit board comprises two second elastic arms, the two second elastic arms are at least partially fixed to the corresponding first elastic arms respectively, and each second elastic arm comprises fifth to eighth parts corresponding to the first to fourth parts of the corresponding first elastic arm. The lens driving device is high in reliability and good in anti-shake effect.

Description

Technical field

[0001] The utility model relates to the field of optical imaging, in particular to a lens driving device. [Background Technology]

[0002] In order to ensure clear optical imaging, it is usually necessary to perform focusing and anti-shake movement on the lens used for optical imaging.

[0003] The lens driving device of the related technology includes a fixed bracket, an anti-shake bracket that moves relative to the fixed bracket for anti-shake performance, and a focusing unit that moves relative to the anti-shake bracket for focusing. The focusing unit is elastically supported on the anti-shake bracket by leaf springs on the upper and lower sides, and the anti-shake bracket is elastically supported on the fixed bracket by suspension wires arranged at four corners.

[0004] However, due to the filamentous structure of the suspension wire, its own structural strength is limited. As a result, it cannot withstand the weight of the entire anti-shake bracket and the focus unit in the event of a fall and is damaged. It is easy to become fatigued and damaged during continuous anti-shake movement. It cannot withstand a large anti-shake movement distance and can only perform anti-shake within a very small range, resulting in low reliability and poor anti-shake effect of the lens drive device in the related technology.

[0005] Therefore, it is necessary to provide a new lens driving device to solve the above technical problems. [Utility Model Content]

[0006] The purpose of the utility model is to overcome the above technical problems and provide a lens driving device with high reliability and good anti-shake effect.

[0007] In order to achieve the above object, the present invention provides a lens driving device, comprising:

[0008] Fixed bracket;

[0009] Anti-shake bracket;

[0010] a first elastic support member, connecting the fixed bracket and the anti-shake bracket and supporting the anti-shake bracket to move relative to the fixed bracket;

[0011] A focusing unit, comprising a lens barrel and a lens having an optical axis and carried by the lens barrel;

[0012] a second elastic supporting member, connecting the anti-shake bracket and the lens barrel and supporting the lens barrel to move relative to the anti-shake bracket;

[0013] a first driving unit, driving the lens barrel to move relative to the anti-shake bracket along the direction of the optical axis;

[0014] a second driving unit, driving the anti-shake bracket to move relative to the fixed bracket along a first direction perpendicular to the optical axis;

[0015] a third driving unit, configured to drive the anti-shake bracket to move relative to the fixed bracket along a second direction perpendicular to the optical axis and the first direction;

[0016] In which, the first elastic support member includes a metal support member and a flexible circuit board that is at least partially fixed to the metal support member, the metal support member includes a first fixing portion that is respectively arranged on two opposite sides of the anti-shake bracket and fixed to the fixing bracket, a second fixing portion that is respectively arranged on the other opposite sides of the anti-shake bracket and fixed to the anti-shake bracket, and four first elastic arms that are respectively connected between adjacent first fixing portions and second fixing portions, and two adjacent first elastic arms are spaced apart from each other at a first interval, the flexible circuit board includes a third fixing portion that is arranged on one of the two opposite sides and fixed to the fixing bracket, a fourth fixing portion that is respectively arranged on the other opposite sides and fixed to the anti-shake bracket, and two second elastic arms that are respectively connected between adjacent third fixing portions and fourth fixing portions, and the two second elastic arms are spaced apart from each other at a second interval and are respectively fixed to at least partially fixed to their respective corresponding first elastic arms. The first elastic arms are fixed in sections, each of which includes a first portion extending from the first fixing portion along the direction of the optical axis, a second portion extending from the first portion along the first direction, a third portion extending from the second portion along the second direction, and a fourth portion extending from the third portion along the direction of the optical axis and connected to the second fixing portion. Each of the second elastic arms includes a fifth portion extending from the third fixing portion along the direction of the optical axis and corresponding to the first portion of the first elastic arm respectively corresponding to the first portion, a sixth portion extending from the fifth portion along the first direction and corresponding to the second portion of the first elastic arm respectively corresponding to the second portion, a seventh portion extending from the sixth portion along the second direction and corresponding to the third portion of the first elastic arm respectively corresponding to the third portion, and an eighth portion extending from the seventh portion along the direction of the optical axis, connected to the fourth fixing portion and corresponding to the fourth portion of the first elastic arm respectively corresponding to the fourth portion of the first elastic arm respectively corresponding to the fourth portion of the first elastic arm.

[0017] Preferably, the fifth portion, the sixth portion, the seventh portion and the eighth portion are respectively arranged on outer sides of the first portion, the second portion, the third portion and the fourth portion away from the optical axis.

[0018] Preferably, the first fixing portion and the second fixing portion are arranged on the same side of the second portion and the third portion along the direction of the optical axis.

[0019] Preferably, each of the second fixing portions is divided into two parts spaced apart from each other by a third interval.

[0020] Preferably, there are two first driving units and they are respectively arranged at a pair of oppositely arranged corners of the anti-shake bracket, each first driving unit includes a magnetic circuit system fixed to the anti-shake bracket and a focusing coil fixed to the lens barrel, the magnetic circuit system includes a magnetic frame and a magnet portion accommodated in the magnetic frame, the magnetic frame includes a top wall and a bottom wall relatively arranged along the direction of the optical axis, and a side wall connecting the top wall and the bottom wall, the magnet portion is clamped between the top wall and the bottom wall, the focusing coil is accommodated in the magnetic frame and sleeved on the magnet portion, the side wall is provided with two notches respectively arranged on both sides of the focusing coil, the lens barrel extends a pair of support arms toward the focusing coil for clamping the focusing coil, and the pair of support arms respectively enter the magnetic frame from the two notches in the side wall and clamp the focusing coil.

[0021] Preferably, when viewed along the direction of the optical axis, the focusing coil and the magnetic part have matching contour shapes, and the magnetic part includes a first focusing magnet fixed to the top wall, a second focusing magnet fixed to the bottom wall, and a pole core sandwiched between the first focusing magnet and the second focusing magnet, and the first focusing magnet and the second focusing magnet are both magnetized along the direction of the optical axis and the magnetization directions of the first focusing magnet and the second focusing magnet are opposite.

[0022] Preferably, two second drive units are provided and are respectively arranged at another pair of opposite corners of the anti-shake bracket, and each second drive unit includes a first anti-shake magnet fixed to the fixed bracket and a first anti-shake coil fixed to the anti-shake bracket; two third drive units are provided and are respectively arranged at the other pair of opposite corners of the anti-shake bracket, and each third drive unit includes a second anti-shake magnet fixed to the fixed bracket and a second anti-shake coil fixed to the anti-shake bracket.

[0023] Preferably, the second elastic supporting member includes a first leaf spring and a second leaf spring provided on opposite sides of the lens barrel along the direction of the optical axis.

[0024] In the lens drive device of the present invention, the first elastic support member includes a metal support member and a flexible circuit board at least partially fixed to the metal support member. The metal support member includes four first elastic arms, each of which includes a first portion and a fourth portion extending along the optical axis, a second portion extending along the first direction, and a third portion extending along the second direction. The flexible circuit board includes two second elastic arms, each of which is at least partially fixed to its corresponding first elastic arm, and each of which includes a fifth to eighth portion corresponding to the first to fourth portions of its corresponding first elastic arm. This provides the first elastic support member with a three-dimensional elastic support structure. Compared to the suspension wire used in related art, this can improve the elastic support reliability of the anti-shake bracket, especially its resistance to drops and fatigue. It can also elastically support the anti-shake bracket for a larger anti-shake distance, thereby improving the anti-shake effect. In addition, the first elastic support member can also serve as a power transmission medium.

Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art in the field of the present invention, other drawings can be obtained based on these drawings without creative work. Among them:

[0026] Figure 1 This is a three-dimensional exploded view of the lens driving device of the present invention;

[0027] Figure 2 This is a three-dimensional diagram of the lens driving device of the present invention with the housing removed;

[0028] Figure 3 A three-dimensional diagram of the assembly of a base, an anti-shake bracket, and a first elastic support member of the lens driving device of the present invention;

[0029] Figure 4 This is a three-dimensional exploded view of the first elastic support member of the lens driving device of the present invention. [Specific implementation method]

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field of the present invention without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figure 1-4 As shown, the present invention provides a lens driving device 100, which includes a fixing bracket 1, an anti-shake bracket 2, a first elastic support member 3, a focusing unit 4, a second elastic support member 5, a first driving unit 6, a second driving unit 7 and a third driving unit 8.

[0032] In this embodiment, the fixing bracket 1 includes a base 11 and a housing 12 covering the base 11. Of course, the fixing bracket 1 can also be configured in other ways, or can include more or fewer parts.

[0033] The first elastic support member 3 connects the fixed bracket 1 and the anti-shake bracket 2 and can support the anti-shake bracket 2 to move relative to the fixed bracket 1 .

[0034] The focusing unit 4 includes a lens barrel 41 and a lens with an optical axis S carried by the lens barrel 41 .

[0035] The second elastic support member 5 connects the anti-shake bracket 2 and the lens barrel 41 and can support the lens barrel 41 to move relative to the anti-shake bracket 2. The second elastic support member 5 may include a first leaf spring 51 and a second leaf spring 52 provided on opposite sides of the lens barrel 41 along the direction Z of the optical axis S. Of course, the second elastic support member 5 can also be provided in other ways as long as it can support the lens barrel 41 to move relative to the anti-shake bracket 2.

[0036] The first driving unit 6 drives the lens barrel 41 to move along the direction Z of the optical axis S relative to the anti-shake bracket 2 .

[0037] The second driving unit 7 drives the anti-shake bracket 2 to move along a first direction X perpendicular to the optical axis S relative to the fixed bracket 1 .

[0038] The third driving unit 8 drives the anti-shake bracket 2 to move along a second direction Y perpendicular to the optical axis S and the first direction X relative to the fixed bracket 1 .

[0039] Specifically, the first elastic support member 3 includes a metal support member 31 and a flexible circuit board 32 at least partially fixed to the metal support member 31 .

[0040] The metal support member 31 includes a first fixing portion 311 respectively arranged on two opposite sides of the anti-shake bracket 2 and fixed to the fixed bracket 1 (base 11), a second fixing portion 312 respectively arranged on the other opposite sides of the anti-shake bracket 2 and fixed to the anti-shake bracket 2, and four first elastic arms 313 respectively connected between adjacent first fixing portions 311 and second fixing portions 312, and two adjacent first elastic arms 313 are spaced apart from each other by a first interval 314.

[0041] The flexible circuit board 32 includes a third fixing portion 321 arranged on one of the two opposite sides and fixed to the fixing bracket 1 (base 11), a fourth fixing portion 322 respectively arranged on the other two opposite sides and fixed to the anti-shake bracket 2, and two second elastic arms 323 respectively connected between the adjacent third fixing portion 321 and the fourth fixing portion 322, the two second elastic arms 323 being spaced apart from each other by a second interval 324 and being at least partially fixed to their respective corresponding first elastic arms 313.

[0042] Each first elastic arm 313 includes a first portion 3131 extending from the first fixing portion 311 along the direction Z of the optical axis S, a second portion 3132 extending from the first portion 3131 along the first direction X, a third portion 3133 extending from the second portion 3132 along the second direction Y, and a fourth portion 3134 extending from the third portion 3133 along the direction Z of the optical axis S and connected to the second fixing portion 312.

[0043] Each second elastic arm 323 includes a fifth portion 3231 extending from the third fixing portion 321 along the direction Z of the optical axis S and corresponding to the first portion 3131 of the first elastic arm 313, a sixth portion 3232 extending from the fifth portion 3231 along the first direction X and corresponding to the second portion 3132 of the first elastic arm 313, a seventh portion 3233 extending from the sixth portion 3232 along the second direction Y and corresponding to the third portion 3133 of the first elastic arm 313, and an eighth portion 3234 extending from the seventh portion 3233 along the direction Z of the optical axis S, connected to the fourth fixing portion 322 and corresponding to the fourth portion 3134 of the first elastic arm 313.

[0044] As an option, the fifth part 3231, the sixth part 3232, the seventh part 3233 and the eighth part 3234 are respectively arranged on the outside of the first part 3131, the second part 3132, the third part 3133 and the fourth part 3134 away from the optical axis S, and the first fixing part 311 and the second fixing part 312 are arranged on the same side of the second part 3132 and the third part 3133 along the direction Z of the optical axis S.

[0045] As an option, each of the second fixing portions 312 is separated into two parts by a third interval 315 . The metal support 31 can be divided into two parts by the first interval 314 and the third interval 315 to facilitate position adjustment during installation.

[0046] As an option, two first drive units 6 are provided and are respectively disposed at a pair of opposite corners of the anti-shake bracket 2. Each first drive unit 6 includes a magnetic circuit system 61 fixed to the anti-shake bracket 2 and a focus coil 62 fixed to the lens barrel 41. Of course, the first drive unit 6 can also be configured in other ways and is not limited to electromagnetic drive.

[0047] Specifically, the magnetic circuit system 61 includes a magnetic frame 611 and a magnet portion 612 accommodated in the magnetic frame 611, the magnetic frame 611 includes a top wall 6111 and a bottom wall 6112 arranged opposite to each other along the direction Z of the optical axis S, and a side wall 6113 connecting the top wall 6111 and the bottom wall 6112, the magnet portion 612 is clamped between the top wall 6111 and the bottom wall 6112, the focusing coil 62 is accommodated in the magnetic frame 611 and sleeved on the magnet portion 612, the side wall 6113 is provided with two notches 6114 respectively arranged on both sides of the focusing coil 62, the lens barrel 41 extends a pair of support arms 411 toward the focusing coil 62 for clamping the focusing coil 62, the pair of support arms 411 respectively enter the magnetic frame 611 from the two notches 6114 on the side wall 6113 and clamp the focusing coil 62. Observed along the direction Z of the optical axis S, the focusing coil 62 and the magnet portion 612 have matching contour shapes, and the magnet portion 612 includes a first focusing magnet 6121 fixed to the top wall 6111, a second focusing magnet 6122 fixed to the bottom wall 6112, and a pole core 6123 sandwiched between the first focusing magnet 6121 and the second focusing magnet 6122. The first focusing magnet 6121 and the second focusing magnet 6122 are both magnetized along the direction Z of the optical axis S, and the magnetization directions of the first focusing magnet 6121 and the second focusing magnet 6122 are opposite.

[0048] As an option, two second drive units 7 are provided and are respectively arranged at another pair of opposite corners of the anti-shake bracket 2. Each second drive unit 7 includes a first anti-shake magnet 71 fixed to the fixed bracket 1 (base 11) and a first anti-shake coil 72 fixed to the anti-shake bracket 2. Two third drive units 8 are provided and are respectively arranged at the other pair of opposite corners of the anti-shake bracket 2. Each third drive unit 8 includes a second anti-shake magnet 81 fixed to the fixed bracket 1 (base 11) and a second anti-shake coil 82 fixed to the anti-shake bracket 2. Of course, in addition to this, the second drive unit 7 and the third drive unit 8 can also be arranged in other ways and are not limited to the electromagnetic drive method.

[0049] In the lens drive device of the present invention, the first elastic support member includes a metal support member and a flexible circuit board at least partially fixed to the metal support member. The metal support member includes four first elastic arms, each of which includes a first portion and a fourth portion extending along the optical axis, a second portion extending along the first direction, and a third portion extending along the second direction. The flexible circuit board includes two second elastic arms, each of which is at least partially fixed to its corresponding first elastic arm, and each of which includes a fifth to eighth portion corresponding to the first to fourth portions of its corresponding first elastic arm. This provides the first elastic support member with a three-dimensional elastic support structure. Compared to the suspension wire used in related art, this can improve the elastic support reliability of the anti-shake bracket, especially its resistance to drops and fatigue. It can also elastically support the anti-shake bracket for a larger anti-shake distance, thereby improving the anti-shake effect. In addition, the first elastic support member can also serve as a power transmission medium.

[0050] The above is only an implementation method of the present invention. It should be pointed out that for ordinary technicians in the field of the present invention, improvements can be made without departing from the creative concept of the present invention, but these all fall within the scope of protection of the present invention.

Claims

1. A lens driving device, comprising: Fixed bracket; Anti-shake bracket; a first elastic support member, connecting the fixed bracket and the anti-shake bracket and supporting the anti-shake bracket to move relative to the fixed bracket; A focusing unit, comprising a lens barrel and a lens having an optical axis and carried by the lens barrel; a second elastic supporting member, connecting the anti-shake bracket and the lens barrel and supporting the lens barrel to move relative to the anti-shake bracket; a first driving unit, driving the lens barrel to move relative to the anti-shake bracket along the direction of the optical axis; a second driving unit, driving the anti-shake bracket to move relative to the fixed bracket along a first direction perpendicular to the optical axis; A third driving unit drives the anti-shake bracket to move relative to the fixed bracket along a second direction perpendicular to the optical axis and the first direction, characterized in that: The first elastic support member includes a metal support member and a flexible circuit board that is at least partially fixed to the metal support member, the metal support member includes a first fixing portion that is respectively arranged on two opposite sides of the anti-shake bracket and fixed to the fixing bracket, a second fixing portion that is respectively arranged on the other opposite sides of the anti-shake bracket and fixed to the anti-shake bracket, and four first elastic arms that are respectively connected between adjacent first fixing portions and second fixing portions, and two adjacent first elastic arms are spaced apart from each other at a first interval, the flexible circuit board includes a third fixing portion that is arranged on one of the two opposite sides and fixed to the fixing bracket, a fourth fixing portion that is respectively arranged on the other opposite sides and fixed to the anti-shake bracket, and two second elastic arms that are respectively connected between adjacent third fixing portions and fourth fixing portions, and the two second elastic arms are spaced apart from each other at a second interval and are respectively at least partially fixed to their corresponding first elastic arms. It is stipulated that each first elastic arm includes a first portion extending from the first fixing portion along the direction of the optical axis, a second portion extending from the first portion along the first direction, a third portion extending from the second portion along the second direction, and a fourth portion extending from the third portion along the direction of the optical axis and connected to the second fixing portion, and each second elastic arm includes a fifth portion extending from the third fixing portion along the direction of the optical axis and corresponding to the first portion of the respective corresponding first elastic arm, a sixth portion extending from the fifth portion along the first direction and corresponding to the second portion of the respective corresponding first elastic arm, a seventh portion extending from the sixth portion along the second direction and corresponding to the third portion of the respective corresponding first elastic arm, and an eighth portion extending from the seventh portion along the direction of the optical axis, connected to the fourth fixing portion and corresponding to the fourth portion of the respective corresponding first elastic arm.

2. The lens driving device according to claim 1, wherein: The fifth portion, the sixth portion, the seventh portion, and the eighth portion are respectively arranged on outer sides of the first portion, the second portion, the third portion, and the fourth portion away from the optical axis.

3. The lens driving device according to claim 1, wherein: The first fixing portion and the second fixing portion are provided on the same side of the second portion and the third portion in a direction along the optical axis.

4. The lens driving device according to claim 1, wherein: Each of the second fixing portions is divided into two parts spaced apart from each other by a third interval.

5. The lens driving device according to claim 1, wherein: There are two first driving units and they are respectively arranged at a pair of oppositely arranged corners of the anti-shake bracket. Each first driving unit includes a magnetic circuit system fixed to the anti-shake bracket and a focusing coil fixed to the lens barrel. The magnetic circuit system includes a magnetic frame and a magnet portion accommodated in the magnetic frame. The magnetic frame includes a top wall and a bottom wall relatively arranged along the direction of the optical axis, and a side wall connecting the top wall and the bottom wall. The magnet portion is clamped between the top wall and the bottom wall. The focusing coil is accommodated in the magnetic frame and sleeved on the magnet portion. The side wall is provided with two notches respectively arranged on both sides of the focusing coil. The lens barrel extends a pair of support arms toward the focusing coil for clamping the focusing coil. The pair of support arms respectively enter the magnetic frame from the two notches in the side wall and clamp the focusing coil.

6. The lens driving device according to claim 5, wherein: When viewed along the direction of the optical axis, the focusing coil and the magnetic part have matching contour shapes, and the magnetic part includes a first focusing magnet fixed to the top wall, a second focusing magnet fixed to the bottom wall, and a pole core sandwiched between the first focusing magnet and the second focusing magnet. The first focusing magnet and the second focusing magnet are both magnetized along the direction of the optical axis, and the magnetization directions of the first focusing magnet and the second focusing magnet are opposite.

7. The lens driving device according to claim 1, wherein: Two second drive units are provided and are respectively arranged at another pair of opposite corners of the anti-shake bracket, and each second drive unit includes a first anti-shake magnet fixed to the fixed bracket and a first anti-shake coil fixed to the anti-shake bracket; two third drive units are provided and are respectively arranged at the other pair of opposite corners of the anti-shake bracket, and each third drive unit includes a second anti-shake magnet fixed to the fixed bracket and a second anti-shake coil fixed to the anti-shake bracket.

8. The lens driving device according to claim 1, wherein: The second elastic supporting member includes a first leaf spring and a second leaf spring provided on opposite sides of the lens barrel in a direction along the optical axis.

Images